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Vehicles - Science topic

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Surrogate Safety Measures (SSM) are used to measure traffic safety. Some video-based software can generate these values from real vehicle traffic videos. So, is there any device that can be mounted on a vehicle, is portable and can measure all/some of the SSM metrics?
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Try PTV vizzum software I think they developed it to measure that.
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the particular matters which are less than 2.5 Micron emitted from vehicles cause air pollution , now which of them is major element I(Hc , No, or other gasses?
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The fine particulates PM2.5 emitted from combustion engines are particles, not gas. The major component of these particles is carbon. As part of PM2.5 may be emitted from other sources, other chemical components are present.
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i mean any example for "idea to application" in the case of solid state hydrogen storage systems like liquid hydrogen and compressed gas. is there any patent or any research journals regarding that?
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James Dewar was the first who obtained the solid hydrogen in 1899. Solid hydrogen has a very low density of 0.086 g/L (compared with 0.050g/L for the liquid form). Thus, you don't have any reasonable improvement converting hydrogen from liquid to solid state.
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Having a global 3D map (generated using slam stereo vision) of a given space, what approach would be appropriate to use this map to localize a vehicle - using stereo vision as an input?
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Multi-lane roads are driven by various types of vehicles. Most cars move on the first lane. At the same time, in most countries, road pavement is designed the same for all lanes. The load of the first strip is taken as the design load. Our observations show that the real distribution of transport exceeds the norm. Therefore, the state of these bands is much worse than the others. Tell me how your countries take into account this distribution of vehicles on the lanes of multi-lane highways. Can pavements of multi-lane roads with lanes of different strengths be designed? Is there such an experience in your countries?
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As experience shows, cars move faster along the left lane (in right-hand traffic), naturally these are lighter cars, i.e. the alternative is simple - heavy but relatively slow, or fast but lighter. First you need to find out what type of load causes more wear on the road. I think that the road conditions in Russia and Belarus differ little. In Russia, partial repairs are carried out as the roads wear out, and I see that the left lanes are being repaired more often. In addition, changes from lane to lane should be taken into account. As a rule, these are made at a speed greater than the average and not only by passenger cars. In this case, the load is far from average and not only traffic lanes work, but also the boundaries between these.
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IN PTV VISSIM i am designing unsignalized T-intersection .SO when i am merging vehicles from minor road to major road while using priority rules so there occur collision of vehicles and dont know how to remove these collisions
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The calibration of the parameters is needed, including the gap time and clearance in the intersections with priority rules.
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Over the next years or so, electric vehicles entered most of the country market with some advanced technology.
Can traditional engine such as Gasoline SI engine and Diesel CI engine and their research will be disappear?
Especially after switching cars market into electric vehicle technologies.
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It is very easy be wrong when you do a forecast. I am ready ready to be proven wrong.
Anyway the themodinamic cycles are not green due to 2nd principle of thermodinamics limitations.
On the other side the electric technologies are not completely green becauase are consuming not renewable resources: I mean lithium for batteries, copper, platinum for cathalisis, rare earths for magnets, and so on.
I see not possible in short times a complete transition
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hello,
I'm trying to plot dissipated power of suspension damper Vs frequency plot from 2-dof Quarter car model in MATLAB Simulink. I'm attaching the image of plot can any one help me to get this type of plot from 2-dof Quarter car model in MATLAB Simulink. It will be be very helpful to procced my work further and i will be extremely thankful to help me.
I'm also attaching 2-dof Quarter car model in MATLAB Simulink and the article which I'm following to plot (Follow equation (30) and figure 5(A) of the article attached ). Please find the attachments and hope positive response.
Kindly help me.
Anybody Please help me. if anyone having any explanation or solution regarding above mentioned my problem kindly contact me on my mail id 20pmee08@iiitdmj.ac.in.
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Hello,
Anyone please help me solve above mention problem.
Thanks and regards
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In VISSIM, what is the stochastic Volume type in Vehicle Input? Will the entered 15 min volumes change?
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Yes you can count a 15min. Volume easily
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As a part of my academic project, I tried to develop a vehicle diagnostics system that is able to test a vehicle remotely using the existing open source tools.
My initial objective was to assess the condition of the vehicle based on sensor data that are available from the OBD interface of the vehicle when queried using their Parameter Identifiers (PIDs).
But I found very little reference on the thresholds of those sensor data. (Example. Oxygen Sensor Voltage, Short Term Fuel Trim, Long term Fuel trim, Intake manifold Pressure, Timing Advance etc.,)
I found a lot of work on Driver behavior analysis based on different methods, acceleration based, jerk ratio based and also various machine learning based models.
Is there a particular reference I can make use of? Any Suggestions/Guidance are appreciated and collaborations in this part are welcomed.
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Hi, do you have a engine test setup you can work on?
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My dissertation topic is a comparison of energy requirements for internal combustion engine, hybrid and battery powered vehicles. I want to use matlab in achieving this.
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I think first of all you have to fix the distance to be travelled or the load(power output) for all systems. Then you need to estimate the fuel consumption for the ICE , the fuel consumed by the hybrid unit and the power discharged by the batteries in order to cover the specified distance or load. Then start your comparison and do not forget the initial and running cost of all units,
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In the future, fuel cells could power our cars, with hydrogen replacing the petroleum fuel that is used in most vehicles today. Many vehicle manufacturers are actively researching and developing transportation fuel cell technologies. Stationary fuel cells are the largest, most powerful fuel cells.
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Only some notes:
  • Fuell cells are producing electric energy. The architecture of a car with fuel cell is similar to hybryd cars: the fuel engine and the alternator.
  • Fuel cell can work with a wide range of fuels including also biofuels
  • the room of efficiency improvement of fuel cells is not limited by themodynamic limits, we can guess in higher efficiency of the system
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Dear Researchers,
Considering the adopted plan to end the production of cars on fossil fuels by 2035, which means a complete transition to electric vehicles, I am interested in your opinions on whether the year 2035 is an ambitious goal for the complete adoption of electric vehicles.
Do you believe that the construction of clean power plants is sufficiently promoted, given that this also entails an increase in electricity demand and the need to provide clean electricity, because otherwise, the transition to electric vehicles makes little sense if sources that emit a large amount of greenhouse gases are used to produce the necessary electricity?
I am also interested in your opinions about freight vehicles and the efficiency of using electricity to drive freight vehicles, primarily airplanes, ships, and trucks. Is it realistic to expect that technology will advance so much in the next ten years that a sufficiently efficient drive mechanism will be developed for such vehicles?
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Dear Matija Kovačić,
The transition from electric cars to combustion cars took place over 100 years ago. From a climatic and environmental point of view, it was one of the biggest dead ends in the development of civilisation. we are now trying to reverse this process. Most car companies already mass-produce some of their models in electric vehicle versions. Some car companies are also already mass-producing hydrogen-powered vehicles, i.e. fully emission-free (also in terms of energy source). New, increasingly stringent standards and environmental, pro-climate regulations in the European Union are motivating the auto-moto business to make this type of pro-climate and pro-environmental transformation. The aforementioned year 2035 is an ambitious date from a political and business perspective. However, given the accelerating process of global warming, the sooner this process of pro-climate and pro-environmental transformation of transport can be carried out, the better for the climate, the biosphere and the biodiversity of the planet, and of course the better for humanity. However, a climate-oriented and environmentally-friendly transformation of transport alone will not solve all the problems associated with CO2 emissions into the atmosphere, environmental pollution, global warming and the growing risk of a climate catastrophe in the relatively near future. Some countries lack a developed charging infrastructure for electric cars. There is a lack of modern, additional, zero-emission power stations to supply electricity to further electric vehicles, which are already available for sale from car brand dealers. There is a lack of a developed business to carry out environmentally neutral disposal of used batteries. There are many problems to be solved. But there is also a lot of eco-innovation and green technology, which, due to political and business constraints, the lobby of fossil fuel mines, oil refineries, large mining companies, energy companies generating electricity and/or heat based on the combustion of fossil fuels, unfortunately does not leave the research laboratories, are not being implemented on a large scale and, as a consequence, the overall process of carrying out the pro-environmental transformation of the classic growth, brown, linear economy of excess to a sustainable, green, zero-carbon zero-growth and closed loop economy is progressing much more slowly than it could. And we have very little time left. According to long-term climate change models, a global climate catastrophe could occur as early as this 21st century.
Best regards,
Dariusz Prokopowicz
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The vehicle to grid is not a new for exchange the power between vehicle and grid. May I get a reference listed countries using mentioned technology?
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The US, Japan, Kenya, Algeria, Nigeria, Turkey, Ethiopia, Germany, Canada, India, China, Malaysia, Brazil, Denmark, Netherland, Marocco, and the UK,
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I want to simulate a grid-road topology (organized streets) with vehicles generate traffic to Road Side Unit (RSUs). Also, if I need to ramp up quickly to 100 or 200 vehicles how can I do that?
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Sai R N Thank you.
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I am trying to build a mobility module using SUMO for my VANET work and I don't fully understand the following terms.
Are Traffic Density (Vehicle/Km) and Traffic Flow (vehicle/km/hour) values only valid for a single 1Km lane and when there is a multiple lane 1Km road, it must be multiplied by the total number of lanes in the 1Km road?
For example, if I selected the Traffic Density to be 40 vehicles/km and I have a 1Km two-way road with 3 lanes on each side, the actual Traffic Density will 40*6 vehicle/km?
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Electric vehicles are still a relatively new technology, and as with any new technology, they tend to be more expensive than established technologies. Can any body tell me some top 10 reasons why do electric vehicles so expensive?
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Electric vehicles are still a relatively new technology, and as with any new technology, they tend to be more expensive than established technologies. Here are 10 major reasons why electric vehicles are so expensive:
1. Development and production costs: Developing and producing electric vehicles is expensive. The technology is still new and there are a lot of costs associated with getting electric vehicles on the road.
2. Batteries: Batteries are one of the most expensive components of electric vehicles. They are also one of the heaviest, which adds to the overall weight of the vehicle and increases production costs.
3. Charging infrastructure: Electric vehicles need to be charged and charging infrastructure is still in its infancy. There are costs associated with building out this infrastructure, and those costs are passed on to consumers.
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Is the use of non salient pole PMSMs a good idea in automotive traction applications?
What are the issues to be encountred when flux-weakening of PMSM at large speed intervals?
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Thank you for your response, Dear Mohamed Mourad Lafifi, but it doesn't provide much of what I'm looking for.
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Hello,
I need to design an experiment in vissim where the network is a grid network. I need to add periodic vehicle input, which means that once a vehicle exit the network, a new vehicle is added in its place on the incoming upstream link. Any suggestion is welcome.
Thanks a lot!
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Henk Taale, Thank you for the suggestion. I can do that, but then the vehicle traveling time will be non-zero. What I want is as soon as a vehicle exit from a link, it re-enters the corresponding upstream link.
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Dear all,
I hope you are doing well.
Can someone assist me where to get the real electric vehicle charging station data like arrival time, departure time, initial SOCs, travel range?
Also if anyone can share the home charging socket data of a particular vehicle for two and more days.
One last point is that one author in the literature mentioned that he got the EV data from the GridLAB-D computer tool. But How to get these data from the GridLAB-D or tool like this, please share the idea.
The reply to this mail will be a great help for me.
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Hello,
I've come across this incredible article. Details all the open source data sets available, as well as the different methodologies of forecasting EV demand.
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the question in the paper is related to vehicle electronics and vehicle control. i am stuck on how to approch such questions so gaining an insight on how to approach will be helpful. thanks
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Muhtashim Altaf MATLAB tutorial might help
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I am evaluating tracking and counting methods to count and track vehicles in an intersection, I want an idea on how I can modify the detection line to count the vehicles such that it counts the cars passing each late because using one line detection method might leave other cars out.
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Thank You
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Global Peak Oil: Are we running out of ‘applied technology’ or ‘basic science’?
1. Whether the decline in the discovery of oil reservoirs at the global-scale – would necessarily mean that – we are running out of oil?
2. Whether oil a finite resource - in order to have a beginning, middle and end of production – at the global-scale (and not locally) – with reference to geological time levels?
3. Do we have any standard time-frame, by which peak oil remains - purely based on - the observed rise, peak, fall and depletion of aggregate production rate in oil?
If not, with geological time scale, how do we deduce the point in time, when the maximum rate of extraction of crude oil reaches?
4. Does the concept of global peak oil production reflect our technological limitations; or real resource exhaustion – at the global-scale?
5. With 75 million bpd of crude oil in 2000 (as against King Hubbert’s prediction of 34 million bpd), whether 110 million bpd (approximately equaling 200 exajoules of global annual energy consumption) can be considered to be the global peak in crude oil production (possibly around 2025);
OR
Do we still have a long way to go to reach the global peak – associated with the complex unconventional oil/gas resources and reservoirs; and with technological advancements?
6. Whether the advancements in alternative energy technologies – which is supposed to have the ability to replace ‘oil as the resource of choice for transportation’ – have really contributed significantly and accelerated the global peak oil concept?
OR
Are they going as a parallel line?
7. Whether the current dependence on crude oil towards world’s (ever) growing energy needs – can afford to ignore crude oil – at any point of time – in the near future (say, for next 50 years)?
8. Feasible to dream a global economy – in the absence of fossil fuels – in the near future?
9. Whether the pandemic has really forced us to rethink about our energy policy?
10. With 1.5 billion vehicles on the world’s roads – which consume nearly half of the world’s oil – is all set to become electric vehicles?
Whether electric vehicles have really started to make a serious dent in oil use – at the global-scale?
[For example, in the next 10 years, only 10% of vehicles in the US might be electric; and probably, Electric Vehicles adoption might take decades to catch up to gasoline and diesel cars.]
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We certainly need new and creative ideas along with changes in behavior if we are to effectively move into the future and avoid crises, as energy is such a large part of modern civilization. This requires constructive dialog and facing difficult facts. Sadly, Western Society is increasingly less able to discuss anything intelligently, let alone constructively. Much of what we see today (especially on social media) could be described as: state your position in three words or less that will preclude any meaningful discussion and also vilify everyone else in the room. The pandemic has only made it worse, when it should have been a wake up call to remind us how much we need to pull together.
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I have an issue where a customer has used Adblue/def products instead of coolant in several vehicle engines.
I need to understand potential issues the adblue can have on an engine and cooling system, some of the things i want to understand is what effect Urea will have on materials like copper and aluminium. i also want to understand how urea will react with coolant products. this is something that has very little information available and i don't know how to approach the problem.
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Hi Thanks for the response, any idea how the product would react in a radiator system?
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What are the typical challenges that could occur? is it more effective than building electric vehicles from scratch?
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The two are so very different, especially with unibody construction, that conversion would not likely be cost-effective. Also, I would be concerned that your modified vehicles would not meet safety standards, leaving you open to fines and lawsuits. Even if you think you're doing a good thing, if someone gets hurt (which they undoubtedly will), some ambulance chaser will sue your pants off, insisting that the victim obtained this modified car from you in good faith, assuming that it was safe to operate or park and leave their children strapped in their car seats. You need to Google "EV bus fires".
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Please share source material and expertise contact for discussion.
Also welcome for collaborative work
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The best resource for this would be the MATLAB community (under Mathworks). For example, the following link covers the subject you are interested in. Good luck.
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There are 2 cluster formation strategies:
1. Distributed stretegy
2. Centralised strategy
which one is best suited for routing in internet of vehicles?
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Dear Farhana,
Both the strategies have their pros and cons. May please refer to the following article which is relevant to the research question.
L. Qiao et al., "Research on Task Assignment Based on Hierarchical Structure for Autonomous Underwater Vehicle," 2021 IEEE/CIC International Conference on Communications in China (ICCC Workshops), 2021, pp. 299-303, doi: 10.1109/ICCCWorkshops52231.2021.9538880.
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we can select a cluster head based on different parameters like random metric, position metric, mobility metric, weight metric etc. which is the most efficient and simplest among all?.
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it might be related to the remained energy of batteries or the estimated next position. the more stable the position would be, the higher possibility of being chosen.
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I want to measure field queue length at a four legged intersection at all the legs, which will be used to calibrate and validate in VISSIM.
What is the best method? Two legs are six lanes and two are four lanes.
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There are two options for measuring the queue length of vehicles in VISSIM.
  • First, you can use the "Queue Counter" and place it on each road lane you wish the queue to measure. This method is a bit tricky, if you place it too close to the intersection and it turns out to be a very long queue, the vehicles behind the "queue counter" may not be captured by VISSIM.
  • Another feature is to use "Link Evaluation" just by activating it (put a checkmark in the blank box in the Evaluation menu). Then, you will automatically generate queue and delay results.
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Hi,
I have a large data set of vehicles, I have make/model/age/fule for each vehicle. I need engine capacity( displacement) to be able to categorize my data into for example mini/small/large diesel passenger cars.
What is the easiest way to find or estimate engine capacity?
thank you
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Md.Nahidul Islam Himel thank you for the link, but I do not have that info and i have only make/model/age/and fuel/type, and the data set has more than 16000 cars, i am looking for a way to classify them to mini/small/ large and so on
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Hi,
I have a technical question about the cars,
In my dataset, I have the make/model/age/fuel of vehicles, what I need is the engine capacity of cars. I need to categorize them based on engine capacity to mini, small, medium, and large.
what is the easiest way to do that? I found a database of technical attributes of cars, but it takes a lot of time to search for each vehicle and for example do make/model of all ages have the same engine capacity? or should I check make/model/year to find engine capacity?
thank you
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There is no correlation between make/model/ages and engine capacity. Vehicles of the same make, model and ages may have different displacements. Thus, the only way is to find the matching vehicle's engine capacity using your known properties (other parameters may be required).
If you want to process large-scale data quickly, you can use python, in which the package pandas can match two databases by the same fields.
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Below is my intended objective using B&R automation studio.
(1)After system start-up, the initial status is :north-south direction red,east-west
direction, green;
( 2) A certain direction red light holds for 30s,and another direction green light only for
25s.When the green light times out, the yellow light is on for 5s,and then two of the direction’s light exchange, repeats itself ;
(3)When emergency condition, the sequence chart is t0, No matter the status of the traffic light, forced green light to the direction of the Vehicles ,the other is then red ;
(4)When emergency released, the sequence chart is t1,forced yellow light 5s to the direction of the Vehicles(t1~t1+5),and then change to red light. After that, Traffic light Controlled is normal
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y12=t3*not(t4)*not(x2) ( the variant nr. 2) y14=t3*not(t4)*not(x2)*not(x1) so y14=y12*not(x1) the transition between this stable states could be realised "instantaneous" if x1=0
this could be discutable
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I think, this is a future problem of a electrical engineer. In 2030 the number of electric vehicles(EV) increasing day by day in USA & other countries. Can our power station generate enough electricity to charge those EV? So I need a solution of this. Can any one give me any suggestion!!!
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As demand for electric vehicles operating on rechargeable DC batteries increases, the present electric grids would be upgraded and more alternative power generation sources would be explored particularly the renewable energy options. Necessity is the mother of invention. Thanks!!!
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Hello
I am a PhD student looking to read some recent good papers that can help me identify a research topic in RL for controls applications . I have been reading through quite a few papers/topics discussing model free vs model based RL etc . Not been able to find something , may be I don't understand it yet to the extent :) .
Just for the background : My experience is with Diesel , SI engines , vehicles and controls .
One of the topics/areas that seems interesting to me is learning using RL in uncertain scenarios, this might seem to broad for most of the people .
Another possible area would be RL for connected vehicles, self driving etc .
Any help/suggestion is welcome .
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combining MARL and safety would be an interesting area
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Hey,
I am using instant-veins and i would like to simulate my own scenario where vehicles allowing CAM messages to be exchanged which contain positions, speed etc. of each vehicle so I would like to know if there is someone among you who can help me build this CAM message to retrieve vehicle information and thank you in advance.
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I hope that the pdf file it will be useful for your project.
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Electrical vehicles have been touted as one of the major ways to combat global climate change. Without combustion of fossil fuel producing gases harmful for human health is a major step towards using electric vehicles but it requires some drastic steps to replace the gas fired vehicles. The cost of vehicles and the lack of supercharging stations are some of the obstacles need to be overcome before making it a potential solution. Unfortunately, this type vehicles are not yet available in many countries. What are your comments?
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Before answering your valuable question, please let me ask:
Does your government encourage electric or(and) hybrid cars? Why? How?
The differences between them are greats. They only car that I have now is an electric one. I will not repeat these differences between the two norms of cars that are already known by our honorable colleagues. But, I want to point to another point. These cars are not suitable for petroleum countries where the petrol price is very cheap. My government does not actually encourage them for some reasons that there is no need to be mentioned here. To prove that, the electric stations are mainly only in the capital of Jordan, Amman. If you go to other cities, you will find only zero or one station that can serve two cars at most.!!
For instance, I went to Irbid and wait in the queue for more than 6 hours; otherwise, I should upload my car in the car winch! Anyhow, I will not repeat that black experiment. My beloved car is only for Amman.
My government can solve the problem in few seconds by issuing the following decision: every gas station must have also two electric stations for serving at least two cars simultaneously.
Image' source
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I will need information on (i) the Best countries to ship cars to Antigua and (ii) Year make and model of the popular cars. I look forward to positive feedback in earnest.
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Dear Dirker Karel, thank you very much for the information.
I appreciate it.
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I am working on a hemin induced toxicity study, but have come across some challenges with using hemin. I was able to successfully prepare a 1 mM hemin solution using neat DMSO. However, my vehicle (0.01% DMSO) is killing my cells. I have attempted to prepare a solution of higher concentration, so that when it is used for treatment in a 6-well plate the percentage of DMSO is lower, but the hemin will not dissolve. It appears that 1 mM is the maximum concentration. Are there other solvents / solvent combinations that could be used to prepare this solution?
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Has this issue been resolved eventually ? We dissolved our Hemin in Sodium Hydroxide (1.4M) as per manufacturer protocol (Sigma) and are also experiencing cell death at 1% Ammonium Hydroxide vehicle.
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If someone is having a herbo-mineral (Ayurvedic Formulation) compound, can PEG be used to coat it or as an vehicle?
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I need to know what are the kind of loads the vehicle is subjected to while cornering, braking and braking with cornering?
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When cornering, the vehicle is subject to a centrifugal force - i.e. transverse to the car - which must be balanced by transverse forces of adhesion. This force pushes the vehicle away from the road and forces it to follow a straight path. Its mathematical formula is FC = mv²/R. It causes the vehicle to skid and roll over. Like kinetic energy, it increases with speed. The tighter the turn, the greater the centrifugal force. The risk of skidding is therefore very high.
When braking, the car is subject to an inertial force. The braking distance is proportional to the vehicle's kinetic energy and varies with it. The vehicle, during its braking phase, is subject to three forces: its weight P, the force exerted by the ground, perpendicular to it, of the same value as the weight of the vehicle.
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Vehicle counting via video graphic software.
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Thanks
Su Zhang
.
Could you please provide me the link where from I can download the software..
Looking forward to your kind response.
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Question-8: How may an intelligent software system be trusted and verified when its state space is infinitive in de facto, such as those of self-driving vehicles and mission-critical robots?
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Yingxu Wang The primary distinction between Level 3 and Level 4 automation is that Level 4 vehicles can act if something goes wrong or if the system fails. In this way, most of the time, these automobiles do not require human engagement. However, a person may still manually override the system.
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I have attempted using DMSO as a drug-delivery vehicle for a water-insoluble drug but it tends to precipitate out after injection into mice. I am considering trying this with a NMP/PEG-300 formulation instead but cannot find any literature of this ever having been done before. Anyone have any insight into this method?
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Jose Chavira can you share some of this literature
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I want to study the response of a quarter car vehicle suspension model to random road profiles (such as class C road) . How to generate a random road profile using simulink?
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To further add to my previous answer, if you are aiming for a particular class of road (e.g. Class C from ISO8608) you can calculate the Power Spectral Density of the white noise input, and then scale the amplitude up/down to match the PSD from the real road.
At a vague guess I would start with white noise with an input amplitude of 30mm, and work from there.
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Suppose I have and HD map, which have many segments (line, arc, spiral, …), that describe the road of the vehicle.
Now, How can I plot or get the coordinates along the spiral given the all following data:
  • start coordinate of the spiral,
  • the heading (orientation) of the spiral,
  • the start and end of the curvature for the spiral, and
  • the length of the spiral.
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Dear @Qamar Ul Islam, thanks for your response, however it is not the correct. Since the video explained the polar spiral or Archimedes spiral.
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is it total load devided by 4 or...?
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A leaf spring includes two main capacities defined on it. They're the capacity of the springs and the axle.
For instance, if a 4-Leaf Double-Eye Spring is rated at 3500 lbs, it'll have a spring capacity of 1,750 lbs, this signifies that the individual spring can carry 1,750 lbs. Assuming the axle weight is 3,500 lbs, which means that when two springs are used, the total capacity is 3,500 lbs.
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I am doing a research using the Udacity Simulation Dataset. My x variable consists of camera images and y is the steering angles of the vehicle. I have used CNN and other networks such as ResNet and VGG16.
I was wondering whether I could use GNN to predict my y variable here? I am attaching my dataset snapshot as a reference. Kindly let me have your views.
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Hi All,
I'm working on to read data from Vissim. I've a network created, it was initially showing vehicles movement during simulation but now it's not showing. I can see VehicleNetworkPerformance results captured for few of the links, few of them are 0. This network has different routing setup for different links.
I want to see the vehicles moving in the UI. What could be the issue?
FYI, I've created very simple network with 3 links and added routing from l1 - l3, i can see the vehicles moving during simulation. The issue exists only in the bigger network.
Please share your thoughts.
Thanks
Viji
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Figured it out, due to quick mode setup the vehicles were not visible in the UI.
Thanks
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The maximum thrust depends on the power of a field generator and the isotropic speed of Dark Energy.
Dark energy is published to be 3970 eV per cubic centimeter. 2.396 e-16 joule/ cm^3
Solar system has velocity 371±1 km/s in the direction (l=264.14±0.3∘, b=48.26±0.3∘) 3.71 e7 cm/sec
Maximum flux is 8.89 e-9 watts/ cm^2.
Suppose the vehicle has 10 meters cross section. 1000 cm, 7.854 e5 cm^2
Maximum flux is 6.9 e-3 watts from isotropic Dark Energy.
Suppose the vehicle has field generator of 371 kilowatts. 3.71 e5 watts.
The minimum thrust is 100,000 Newtons. 2.25 e4 pounds of thrust. 0.127 nt/cm^2 or joule/cm^3
Suppose the vehicle has 100 e3 kilograms of mass.
Minimum acceleration is 1.0 meter/ second squared.
Depth of field 5.30 e9 km interacting in 17.7 seconds
For one Earth gravity acceleration the field generator would need 3.64 megawatts reaching relativistic speed in about a year, and opening a wormhole of kinetic energy in about two years. Depth of field 5.19 e10 km interacting in 170 seconds
Power ratio 3.64 kw per kg..
How Much Thrust Can Be Produced By Interaction With Isotropic Dark Energy?
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@Vladimir A. Lebedev
No, it's not the same idea. Completely different, we interpret dark energy according to a logical law that can happen. We made two scientific predictions. The ether to rush inward. This inward flow of ether is what causes gravity. But our theory. Universe is not created as a result of the Big Bang, but as a result of a leakage of energy from the inner universe, (the center), that led to the emergence of a new external universe, which is our current universe. This inner universe is currently the center of the universe and causing the acceleration of the universe expansion. This can be explained in details as follows:
First of all, the leakage of the energy from the center, (inner universe), has created the current universe. Due to this leakage, the speed of the center's rotation is increasing at a fixed point with time as a result of the decrease of its energy and mass, and due to the lack of the friction and resistance. Increasing rotation leads to increasing the leakage of the dark energy as a wave that forms acceleration, causing an increment in its outer perimeter, which leads to an increase in the universe expansion. The decreased energy from the center causes a reduction in the mass, which leads to more rotation and so on. This rotation causes expansion in space-time, which leads to a direct proportional relationship between the expansion acceleration of the outer universe and the increased rotation of the center of the universe around itself in a fixed point.
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Are there any available datasets of autonomous vehicles trajectories with GPS and date times specifications? if not, how would one adapt existing datasets, which are obtained from normal vehicles, to autonomous ones if possible?
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Here are same datesets for vehicle trajectory prediction/planning:
Argoverse
Appoloscape
NGSIM
HighD
nuScenes
CommonRoad
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I'm interested in extracting the vehicles' trajectory of each vehicle during my simulation. I'm not sure if there is a way to export each vehicle trajectory (x, y, time-stamp). I'm considering a signalized intersection.
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Alceu Dal Bosco Junior , many thanks for you suggestion. Just to add to the discussion below a script to export .fzp file to excel.
`# -*- coding: utf-8 -*-
"""
Created on Mon Feb 28 10:33:07 2022
This script export a xlsx file from the .fzp
VISSIM's direct output
See Jupyter Notebook for plot results on :
@author: agustinguerra
"""
from pathlib import Path
import pandas as pd
import os
from datetime import datetime
# get time to save excel data files
now = datetime.now()
current_time = now.strftime("%y%m%d_%H%M%S")
# seek for fzp file and transfor to text
file_name = 'Speed At Signals_001.fzp'
p = Path(file_name)
# save text if no text file in directory
if os.path.exists(file_name):
p.rename(p.with_suffix('.txt'))
# open text file get right lines to read from
file = open("Speed At Signals_001.txt", "r")
lines_list = file.readlines()[20:]
file.close()
# write to txt file the data
textfile = open("Speed At Signals_001.txt", "w")
for element in lines_list:
textfile.write(element)
textfile.close()
# read data frame and save it to notebook directory
read_file = pd.read_csv('Speed At Signals_001.txt', sep='delimiter', delimiter=';', )
column_names = ["time", "vehID", "lane", "lane_index", "position", "des_speed", "dist_tsb", "speed", "acc"]
path_to_notebook = os.path.dirname(os.getcwd()) + "\\Notebooks\\"+str(current_time)+".xlsx"
read_file.to_excel(path_to_notebook, index=False, header=column_names)
`
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I want to write a scalable VANET routing protocol in NS3, I aim to create a scenario with a number of vehicles and RSU using clustering technic. Is there a need to use SUMO and NETEDIT or writing it in NS3 enough?
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Assume vehicle is off and windows are closed. Can enough fresh air enter through door seals or fresh air intake in cowling to provide enough oxygen. Assume one person is in car.
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Richard Muscoplat I guess its actually carbon monoxide maximum!
However, According to a recent research by Swedish sensors maker Senseair, CO2 levels reach 1,000 ppm in 1.5 minutes, 2,500 ppm in 5 minutes, and frightening 6,000 ppm after 22 minutes, although with air flow ventilation powered on! Drowsiness is also a factor for 10% to 30% of car accidents annually, with high CO2 levels being a significant contributor. The usage of CO2 sensors in automobiles can help manage ventilation and perhaps protect fatalities. Modern automotive interiors are modeled to constantly deliver adequate air flow to manage CO2 levels for an individual traveler around or underneath 2,500 ppm. Therefore, by switching on "recirculate," the relatively stable flow of fresh air is halted, resulting in CO2 accumulation.
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Hello,
I am Ali who is Race Car Vehicle Dynamics enthusiastic. I want to make a Vehicle Model on Simulink. However, I have a lot of questions to begin it. Firstly, I do not have a idea about which outputs I can get and how to interprate them. Secondly, I do not have an idea about how to start.
Any words you may say will help me.
Thanks in advance.
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A good point to start is to check the documentation for those official Simulink vehicle dynamics models:
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Hello everyone,
I am struggling with quantitative data analysis as I have not done it before. My questionnaire is about electric vehicles and I am looking on key factors that influence people's willingness to adopt electric vehicles. So, consumer behaviour in short.
I use Survey Monkey to collect data, therefore, it is easy to extract data in excel, figures, percentages, key words etc. What I need your help is;
1- Which method should I use to analyse? (best if it is the easiest one :)
2- Can I indeed just analyse by myself? This might be silly but surveymonkey gives everything I need, percentage, key words etc. Can I, for instance, give general overview of percentages, responses etc. Then start analysing and discussing question by question?
I am super lost and any help is appreciated! :)
Many thanks
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Gökay Cinar, it's almost a year now, and I hope you have moved forward with your research. I once published a paper utilising a slightly similar question. There is a need to analyse the responses per question and create themes as the factors. Below is an article that may assist:
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Electric Vehicles are gaining acceptability all over the world . Further, carbon emission concerns could bring in policy changes in future, thus, hampering the growth of IC based vehicles. EVs could be disruptive in nature slowly killing the market . If that scenario is going to take place, how would the leading manufactures and their ancillary units are going to gear up for the future. I request learned members to provide answers to this critical question which is going to impact the existing auto ecosystem.
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I think the major car manufacturers already have at least one or two electric car models (I cannot actually name each of them for I don't know that much.) But I understand the strategy is that "good amounts of net profits from market IC cars is going into R&D, innovation side of the electric vehicles which is definitely a good sign that they are getting ready for the shift." The rise in jobs for power electronics and electrical machines within electric vehicle sector also signifies this fact. Personally, I was getting many calls from automotive sector as an electrical engineer.
But I think we need to see the numbers of new refineries or extensions that are happening all over the world too in terms of new projects. This shows us how much is going into investing under petroleum refineries. but that can be again for textiles or chemical manufacturing.
The shift from IC to EV will take longer in developing countries as everyone knows, that way, the major car manufacturers know that they still need to innovate in IC vehicles as well.
I want to know if anyone gives statistics for some of my answers. I can evaluate my approach towards it then!
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i have to do some simulations related to vehicle so if any one know about 3D model of car or any other vehicle in hfss so please share with me.
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Izaz Ali Shah What type of boundary should we assign to body part of a vehicle on which the antenna is being placed.
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For my research purpose:
Can anyone provide me the data of how many vehicles (all sort of) have been sold in the past 10-20 years? At least for last 5 years.
Thank you in advance.
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We are working on a piping sprinkle fire supression system for an %100 electrical bus.Currently we are using C02(g) for physical suppression with 50 bar but we can not obtain the measurment in barometer. First do you have an advice for this problem ? Second is there any other suppression option for this type of vehicle ?
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Canberk Usta please send your email to me at drwhocooke@yahoo.com for detailed discussion. I worked exclusively with CO2 and its many applications for over 15 years of my professional career.
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I want to measure the ratio of open spaces such as parks and gardens to the number of children in a city.
There are quite a few parks in the city, and their width and fun park vehicles are also very few.
However, my understatement is not based on a scale. I want to compare it with other cities and reach a conclusion based on the number of children in the available park areas. I need sample research and scales on this subject. I would also like to benefit from studies evaluating the subject in terms of city planning approaches.
Thank you for all the help.
Abdurrahman
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Thank you very much, dear Espiñeira and Libardoni. I will consider your suggestions. As you said, although these are not exactly what I want, they will be useful to me in my research. Thank you for your answers.
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I am currently interested in autonomous construction vehicles. Specifically I am looking at the model and Control of crawler loaders. So if you could recommend any books or articles on the topic or have any tips, please post them here.
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In general, robotic kinematics is required for defining an end-location, effector's orientation, and motion of all joints, whereas dynamics modeling is required for evaluating and synthesizing the dynamic behavior of the robot.
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Good evening Respected sir/Mam
My research involves usage of Unmanned Aerial Vehicles and I am using Mininet WiFi emulator , so I am considering the Access Points of Mininet Wifi as UAVs, because of inherent dynamic nature of UAVs I want to add mobility feature to it , Is it possible to make Access Points or switches mobile by using mobility functions inside Mininet Wifi ?
So far I have not found any material on internet where Access Points are considered Mobile .Can any one provide me good reference material also please
Kindly reply
Thanks and regards
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Good question
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I am doing traffic simulation of roundabout in Vissim. During simulation some cars wait or stop longer at the start of conflict areas inside roundabout even they have space to move. What is the reason? (its a non lane based)
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Dear Dr. Ayesha Hakim ,
I suggest you to have a look at the following, interesting video:
- Dublin Roundabout Simulation
My best regards, Amir Beketov.
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Hello all, please I need a third or higher order system in the automobile for controls modelling. Can be linear or non-linear.
Thanks
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The vehicle lateral dynamics model (single-track) is second-order. The path-following kinodynamic model is fourth-order.
See R. Rajamani, Vehicle dynamics and control, 2. ed. New York, NY Heidelberg: Springer, 2012.
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Be a military vehicles or civilian vehicle it's has a specific vehicles for its specific domain like car, humvees etc for land, ship, destroyer and submarine etc for water, jet fighter, helicopter and aeroplane for sky and rocket, space shuttle etc for space instead of making many vehicles for specific domain why not make a multi purpose vehicle that operates all types of domain without a problems
Please share your ideas and thoughts
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Defense community curmudgeons, and there are many, will point out that the United States has already been coordinating military operations across domains. After all, humans have used armies and navies in tandem for thousands of years. Arguably, nearly 115 years after the invention of powered flight humans are still learning how to incorporate the air domain into warfare. The use of space is even more recent, dating from the 1957 launch of Sputnik, and cyber is undoubtedly in its infancy, employed for espionage and other malicious purposes since its inception. According to Rand Coorporation, to make multidomain useful, it has to be meaningful. The multidomain operations are those that bring together capabilities from at least two of the following domains: air, cyber, land, sea, space and the electromagnetic spectrum. The current focus on multidomain rises from a growing sense that the space and cyber domains will have an important impact on future military operations. Both threats and opportunities are at play here.
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I am currently considering SEA(Series elastic actuator) as a candidate for active suspension.
Our system consists of variable damper and SEA.
SEA can have a good force estimation capability and thus can be used as a good actuator for linear actuator.
However I found only a few references of SEA application on this vehicle suspension field.
Lots of application are found in the field of robotics.
I am thinking re-design RF-SEA or F-SEA in order to fit with vehicle suspension system combined with variable damper, which results in active suspension with reasonable design and cost.
Is there anyone who can describe about the pros and cons of SEA for the application on vehicle suspension? Is there any application examples in the field of vehicle suspension?
I need to increase the power and relevant designs of SEA for vehicle suspension (2~3 times larger than that of robotics application's). Is it possible easily? or is there any technical problems with large payloads and versatile driving conditions (i.e. rough roads, bump/humps, ... )
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Dear Khan,
Thanks you for your valuable comments regarding SEA.
I saw the paper you recommended. Thanks for recommending this paper to me.
I have one additional question. What do you think is the main function of the variable stiffness in this design described in the paper?
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Hello everybody! Hope you are doing well!
I'm about to treat male rats with pyrethroids orally. Pyrethroids will be dissolved in an oily vehicle. So, I would like to know how to clean the labware after dissolving the pesticides. I hope you can share any cleaning protocol with me!
Thanks!
Santiago
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Dear Santiago, this is a very important technical question of broad general interest. My suggestion in general for cleaning laboratory glassware is to use a base bath made by dissolving solid KOH (potassium hydroxide) in ethanol. Soak the labware in this bath over night, then place it for another 24 hours in a bath of dilute HCl and then rinse thorughly with water. You can easily find different recipes for such base baths on the internet, e.g. the following in which isopropyl alcohol is used instead of ethanol::
Always be very careful when working with such base baths and always wear rubber gloves and safety glasses! Alkaline solution are particularly dangerous when they come in contact with the eyes. Particularly round-bottomed flasks can be very slippery when taken out of the base bath.
Good luck with your work and best wishes!
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If the aerial vehicle like blimp or quadrotor is required to track the 3D position coordinates then how we will generate the reference trajectory for the vehicle? What will be the reference roll angle, pitch angle, and yaw angle for tracking the desired spatial position coordinates?
For optimal control, the problem formulation is simple like you can select the position states as your outputs and the rest of the states will act as an internal state. Your system will be three outputs and multi inputs. While for SMC you will need the desired position, attitude, and their successive derivatives.
Your suggestions are valuable to me...
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Theory:
1-Path planning problem: We can use a global path planner algorithm such as RRT, RRT* or A*. Input of path planner module: Initial position and final position of the vehicle.Output: list of reference waypoints in the form of (x,y,z) triples.
2-Trajectory generation problem: This aims to generate a dynamically feasible smooth trajectory that passes through the previously obtaiNed waypoints. Input: waypoints. Output: continuous polynomial representing the trajectory (time-parametrised path). You can use for instance B-spline algorithm.
3-Control problem (flight control system, trajectory tracking control): Let consider a quad rotor aircraft for instance. We should design a position tracking controller and an attitude stabilization controller as follows:
3.1-Position tracking controller (besides velocity controller): input: generated trajectory. Output: reference attitude angles.
3.2-Attitude stabilization controller (besides angular rate controller): input: reference attitude angles. Output: motor control signals (low level control).
Practice:
A commercially available autopilot such as PIXHAWK can be be connected to another companion computer like RASPBERRY PI or JETSON NANO. Path planning, trajectory generator, position controller can be implemented in ROS framework in the companion controller. PIXHAWK autopilot can be used for the low level control including attitude stabilization.
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Hi,
when i want to choose the model for my data, how should i decide that should i use the count model or discrete choice model (ordered or unordered)? i want for example estimate the number of electric vehicles per household. should i run the models and compare them together?
thank you
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Hi ,
If I understood your question correctly, I would suggest to think on what's your purpose of estimating this model. If you are interested in answering the number of electric vehicles that each household would have, count model can answer to this question. In another way around, you may choose discrete choice model. At the end, trying different model formulations and compare their explanation power is necessary.
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I envision a system embedded within a speed bump. So, whenever a vehicle passes through the speed bump (mostly at low speed) his weight will serve as a force applying pressure on the piston within the speed bump. I see a potential here of generating energy. but you could help me understand more how pressure could converse to electrical energy
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Piezoelctric generator must be the most efficient way of converting and utilising such pressure energy . Can be designed to work in both up and down movement of the bump.
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I wish to simulate a scenario in SUMO as follows:
I wish to define some vehicles that are randomly located in a residential area on the network, and then these vehicles will move to their corresponding workplace that is located randomly in the industry place on the map. Afterward, these vehicles are expected to return to their corresponding residential area.
I also wish that each vehicle move according to a daily schedule. Which demand generation would suit my scenario?
According to the link below, there are a few methods but I am a little bit confused about which one is more suitable for my scenario.
Thank you in advance for your attention.
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You have to model the movements. i.e you create the route in the code
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As we know V2X is vehicle to everything communications, which includes but not limited to V2V, V2I, V2P, V2G and so on. Do we have a holistic simulator that enables programming, and simulations for V2X communications ? or is it that individual technologies like say V2V or V2G, have their own individual simulators ? looking for answers and comments in these regards, Thanks in advance.
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take a look at NS3 or Omnet++
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Hello Dears,
I'm doing a safety study on Malaysian Expressways (E1, E2, & E8) so, I need traffic volume data of the North-South Expressway (E1, E2) and East Coast Expressway (E8) includes, Annual Average Daily Traffic (AADT) and Average Daily Traffic (AADT) of heavy vehicles for at least one year such as 2016, 2017, or 2018.
Please help me with this thank you All.
Best Regards
Fathi Alkhatni
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You can get data from road and transport authority.
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For most drivers who manually control a vehicle, obeying traffic regulations like speed limits looks like a huge task for them as some overlook the importance of these strategically placed limits. Our quest is to devise ways to use AI-based technology in both autonomous and manually controlled cars to detect these speed limits on the road and for the AI technology to proceed to act on it in bringing the vehicle to a lower speed when the vehicle is travelling at a speed out of range. Issuing warning about a speed out of range is another thing and it all falls on the driver to heed to the warnings or not.
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Hi Eric Ntiamoah . I agree with Qamar Ul Islam . Thanks.
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Hi
I would like to know the standard approaches (methods) for cable teleoperated underwater ROV. So the standard teleportation control methods of the underwater ROV with joystick cable
Thanks
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Im referring to the control feedback to close the loop, Does it use Velocity or Force or what other approaches?