Rails - Science topic

You're tackling a practical and important problem in railway infrastructure management. Adapting the TUG_TQI to your specific context and defining meaningful quality classifications are crucial steps. Here's a breakdown addressing your questions, combining methodological considerations with practical advice:

I get the same error when I want to run a simulation with worn profiles. Did you solve the problem?

Thanks

Lukas

Waste heat recovery systems can be seamlessly integrated with propulsion units in marine and rail industries by capturing exhaust heat and converting it into usable energy through technologies like Organic Rankine Cycles or thermoelectric generators. This recovered energy can then support auxiliary systems or feed directly into the propulsion system, reducing fuel consumption and boosting efficiency without adding significant complexity.

Mehmet Ugural

You may do this yourself:

Click on the title of the preprint paper to open its dedicated page.

On the paper’s page, you will find an "Edit" or "More" button (usually in the upper right section). Click on it.

In the dropdown menu that appears, select the "Delete" option. If this option is not available, you may need to look for it under "Manage" or similar settings.

A pop-up window will appear asking you to confirm the deletion of the preprint. Confirm the action to proceed.

ResearchGate may take some time to process the deletion. If the paper is not removed immediately, check back after some time or refresh your profile.

Hi, I am working on a similar problem for Ball bearings. Could you suggest some correct contact definitions ? Thank you! Hajar Rhylane

Dear Mrs. Zdenka,

I recommend you the attachment. The permissible deviations are expressed there,

Regards

Arek

It's currently a work in progress. The Government is trying to revamp the railway system all over the Country.

thanks to you dear sir Nils Wagner .

@mr khalak .. please share some calcultaion methods

Dear @Ajibike Joan Farounbi really many thanks for considering my question. I just wanted to mention that I used Cerig, Apdl command to couple the wheel nodes to the pilot node at its center refered as (numbernodes+1) in the code. Is this is equivalent to CP command?

Thank you so much for answering my question.

Sincerely yours

Dear friend Behzad Rezaei asmarood

Hey there! I'm thrilled to dive into the world of friction buffer-stops and help you Behzad Rezaei asmarood out. When it comes to the material for friction elements, the choice is crucial for effective performance. For friction shoes in a friction buffer-stop system, a specific type of phosphor bronze is indeed commonly used.

Now, considering the rail grade is R260, you'd want a material that complements this setting. Phosphor bronze alloys with varying compositions are available, and the choice depends on factors like the intended application, load conditions, and wear resistance.

For your modeling FEM (Finite Element Method) endeavor, you Behzad Rezaei asmarood might want to look into specific phosphor bronze alloys known for their frictional properties, durability, and compatibility with the rail grade. It's advisable to consult materials databases or literature on railway engineering for precise details on suitable phosphor bronze alloys for this application.

To get more specific information about the type of phosphor bronze needed for your friction shoes in the context of a friction buffer-stop system with an R260 rail grade, you Behzad Rezaei asmarood might consider reaching out to industry experts, railway engineering forums, or the technical specifications provided by the relevant railway authorities.

Remember, I am here to guide you Behzad Rezaei asmarood through the quest for the perfect friction material. Let's delve into the world of materials and engineering with gusto!

Both are crucial.

NTK- helps us to focus on the actual cost we are charging per comodity and hence able to focus on the cargo transportation efficiency. On the other side, GTK helps us to measure and understand our efficiency in the total cost of transporting that cargo - including the whole train movement cost, giving us a broader view of the cost involved.

It's B<C

It maybe helpful if you give some clear idea about What biodiesel is this? How much quantity did you check? and how do you know about the colour change?

Dear Mr. Pool!

I found for YOU the following resources:

1) Török, Á., Szalay, Z., Uti, G. et al. Modelling the effects of certain cyber-attack methods on urban autonomous transport systems, case study of Budapest. J Ambient Intell Human Comput 11, 1629–1643 (2020). https://doi.org/10.1007/s12652-019-01264-8 Open access:

2) Ben Farah, M.A.; Ukwandu, E.; Hindy, H.; Brosset, D.; Bures, M.; Andonovic, I.; Bellekens, X. Cyber Security in the Maritime Industry: A Systematic Survey of Recent Advances and Future Trends. Information 2022, 13, 22. https://doi.org/10.3390/info13010022, Open access:

Yours sincerely, Bulcsu Szekely

The crack propagation is due to shear stresses, which are triggered cyclically by the rollover process (rolling contact). In this respect, there is a fatigue fracture. Defects hidden beneath the surface act as crack starter. The higher the stress, the deeper extents the tension field into material. Then the number of defects that can serve as crack starters also increases.

From my experience the freight village concept does neglect two important insights: a) transshipment and handling costs are tantamount and usually underestimated ex ante; b) competition between LSPs is constantly prohibiting them from cooperating like required in the GVZ approach. So therefore usually they (GVZ) emerge due to political pressure and management "lip service", but the real growth and business value is produced somewhere else.

@Muhammad Arfan Abker . Please share if u have .

Although the problem has been resolved, I would like to point out the following information that may be useful to you or others. It is highly likely that these resonances, which still remain below 50 Hz, are probably related to "rigid body motions". Also, the 100 Hz limit where you ended the analysis seems to me too low. Only the first vertical resonance frequency of the railway sleepers can exceed this value. In any composite design you make, each structural element has separate resonant frequencies in the free-free mode. If you subject these structural elements to modal analysis together as in railways, you will obtain an integrated FRF graph containing the resonance frequencies of each structural element (sleeper, rail, etc.). Therefore, it will be useful to know the resonance frequencies of each structural element separately beforehand. Of course, the analysis results vary according to the support form of these structural elements. Examples of finite element and experimental modal analysis studies can benefit from:

Dear Jb Tan

Crushed stone, washed gravel, bank run (unwashed) gravel, torpedo gravel (a mixture of coarse sand and small gravel), slag, chats, coal cinders, sand, and burnt clay have all been used as track ballast. Ballast is derived from a nautical term for the stones used to stabilize a ship.

Kind Regards

Thank you sir akula and Chen ding

The descriptive statistics will describe your sample; then it will be followed by the necessary steps for inferential statistics, in order to infer the results to the population.

The analysis approach will be focused on analyzing each variable or question in the questionnaire and also on testing the relationship between any different variables.

Each variable can be numerical scale, categorical binary, categorical nominal, or categorical ordinal. The descriptive statistic of the sample for each numerical scale variable will be based on computing: Central Tendency “Mean - Median - Mode”, Dispersion “standard deviation – range – maximum – minimum”, Position “quartile and percentile”, Skewness & Kurtosis, and drawing the histogram. The descriptive statistic of the sample for each categorical variable (binary, nominal, or ordinal) will be based on computing: frequency distribution table “FDT”, and drawing the equivalent bar chart or pie chart.

Each two variables relationship can be a combination of each of the four different variables “numerical scale or categorical binary, categorical nominal, or categorical ordinal”. The descriptive statistics of two numerical variables relationship will be based on computing the correlation between them and drawing the split histogram. While the descriptive statistics for two categorical variables (binary, nominal, or ordinal) will be based on the contingency table and the relative chart. Lastly, the descriptive statistics for one categorical variable & one numerical variable will be based on computing the numerical descriptive statistics for each option in the categorical variable.

If you need to infer your results to the population, then a null hypothesis (Ho) can be assumed. If Ho is rejected, then the alternative hypothesis (Ha) is adopted.

Regards

@kolita

Sir normal railway track please

Dear Pardeep Kumar

Apparently, Geometry is often drawn in 3D, also when it is axisymmetric. The analysis will be much faster when making use of the axisymmetry.

Kind Regards

check this https://en.wikipedia.org/wiki/Transmission_control_unit

Glue Command

Our new article "Modal and Harmonic Response Analysis of New CFRP Laminate Reinforced Concrete Railway Sleepers" maybe usefull for you.Here's the full-text link for private use only.

Hi, Have you solved this problem? I also have the same problem that cannot be solved. The error message is as follows. Thank you

ERROR: Cannot determine nominal rail offset of Rail-Wheel Pair

$S_Wheelset_Front.$RWP_Right.

ret = 1

Please try again with better initial values.

For Railway, try the UIC, the Worldwide Railway Organisation

Wireless sensors have certain limitations in structural engineering. If I need to do the test, I prefer Surface Mounter Electrical Resistance Strain Gagues, which can work for metal (rail) and other surfaces. Easy to install and take measurement. Reliability will be better, if the gauges are connected to suitable electrical network, for continuous monitoring. This is quite economical and robust. Radar based systems may be expensive.

Adding to Christian's answer - your hypotheses are 'leading'. It is unconventional to identify degrees of significance before the data. What would be your null hypothesis? Also - against what?

Invest in people.

The railway maintenance regime is determined by the effect of a failure (loss of function). In general, whenever a failure results in a safety risk (potential life-threatening hazard) preventive regime is preferable - often legally mandatory by national law, e.g. German General Railway Law https://www.eba.bund.de/DE/RechtRegelwerk/GesetzeVerordnungen/Eisenbahnrecht/eisenbahnrecht_node.html.

This applies to most infrastructure and signaling assets, like rail, switch, signals, level crossing, etc. Naturally, there is always a residual risk that something preventively maintained fails nonetheless. Hence corrective maintenance is still required in these minimum cases.

The problem is the trade-off between preventing and the costs of inspections and loss of usefull life. To optimize this trade-off predictive maintenance is at the top of infrastructure managers wish list - besides never-failing assets.

Much of the research in leisure satisfaction in travel and tourism has focused on two programs of research: (1) the distinction between instrumental and expressive indicators of leisure satisfaction and (2) the measurement of the leisure experience as a component of QOL …

Neal, J. D., Sirgy, M. J., & Uysal, M. (1999). The role of satisfaction with leisure travel/tourism services and experience in satisfaction with leisure life and overall life. Journal of Business Research, 44(3), 153-163.

Following paper presents, Sustainability indicators for festival tourism in A multi-stakeholder perspective...

Liu, C. R., Lin, W. R., Wang, Y. C., & Chen, S. P. (2019). Sustainability indicators for festival tourism: A multi-stakeholder perspective. Journal of Quality Assurance in Hospitality & Tourism, 20(3), 296-316.

You can possibly ref the below articles:

Pearlite is seen with different colors in bright field illumination due its orientation of individual pearlite colony. At Higher magnification when when light reflects back into eyepiece in optical microscope color is seen different. In actual terms pearlite has no color.

The simplest way to measure transmissibility is the two accelerometer method. One accelerometer is placed directly above the rail pad (i.e. bottom flange of the rail) and the second accelerometer placed directly below the rail pad. You will also need a two channel data acquisition system as the output from the two accelerometers must be recorded simultaneously.

Hi Dear Belalia

You can see to my publications too.

Regards,

Reza

Hi dear Zdenka

Please see:

Regards,

Reza

It is interesting that you could understand that language. Jie Liu

بالنسبة للصناعة ليس من اختصاصي

. اسفة. وشكرا كل التوفيق

The PVDF film sensors are broadband and will work from a few Hz to to their resonant frequency in the MHz range. They do need to be bonded to the metal though (epoxy). They are a favorite for use as a guitar pickup.

Hence the question you asked very general, if you would be more specific then may you get the answer, whatever you are looking for, but the following are considered the basic books for the topic "Rail Project management"

1) Mapping Interface Management to Project Management: Railway Project Case Study by Yazan Abualfeilat

2) Railway Works Engineering & Construction Project Management by M.M Agarwal and M.K Gupta

3) Objective Railway Engineering - Track, Works & Others by by M. M. Agarwal

All the best with your Project

Well, that depends on the dynamic characteristics of your problem and the solver type. If you use something like newmark-beta, i would go ahead with a timestep of at least 1/10 of the period of the highest significant frequency content in the system's response (something that you have to figure out a priori....). and using some explicit solver types you might need a much higher sampling.

link:

Dear Zainah Namayanja,

I suggest you to see links and attached files on subject.

Optimization of a bogie primary suspension damping to reduce wear ...

https://www.researchgate.net/.../288805138_Optimization_of_a_bo...

Examination of Vertical Dynamics of Passenger Car with Wheel Flat ...

Towards optimization of a high speed train bogie primary suspension

Bogie Rotational Resistance

www.simpack.com/.../simpack/...User...2017/3-4_2017_Simpack_...

On Active Suspension in Rail Vehicles - DiVA portal

Best regards

Technical Committee CEN/TC 256 “Railway applications” has prepared the standard EN 17318 “Railway applications – Infrastructure – Plastic sleepers and bearers”, which consist of the following parts: — Part 1: General requirements; — Part 2: Product testing; — Part 3: Material characteristics.

I think this is useful information for your.

In reality, the rail and sleeper are connected using fastening system and rail pad. In mathematical or numerical modeling, it is very common to model this using springs and dampers in vertical and lateral directions.

Hi Loreta, I recommend the R package adehabitatHR (Calenge 2006). This package allows you to estimate home ranges using GPS point locations as those you have. The package implements several home range estimation methods from the traditional minimum convex polygon to more sophisticated functions like the classical Kernel method, which gives you a probability to relocate an individual in a certain area (the utilization distribution, UD). Moreover, you could display isopleth or contour lines that allow you to see the areas or patches were the animal spent more time on average. This package also implements several methods (e.g. Brownian bridge kernel) that take into account not only the position of relocations but also the path traveled by the animal between successive relocations. I only have used the MCP and the classical Kernel. For Kernel, it is key to have at least a minimum of 50 relocations per territorial pair or focal individual to make acceptable estimates of home ranges. If your point samples per invididual / pair are less than 50, Kernel could overestimate the home range. In this case, it is good to perform a bootstrap analysis of randomly selected points (see Anich et al., 2009, Auk 126: 626-634).

Thanks a lot Mr. Arun Kumar and Mr. Patil. I will contact soon.

Hi dear Paulo Pereira .

In Interaction Module , please define Contact ( tangential behavior : 0.3 penalty friction and normal behavior: Hard contact ) and after Define general contact as following picture>>>>>

Please look at the work at this paper:

One important research topic with relation to railway infrastructure management is to find ways to assess maintenance quality, especially when managing subcontractors for maintenance. The callenge is to answer if a maintenance activity was effective (has it reached an expected level of improvement) and sustainable (does the improvement last long enough).

pl check it

It is a very interested question

theses links may help you

pl check it.

http://www.holtecnet.com/holtecdocs/TechnicalPapers/p_2011_5.pdf http://www.ijetmr.com/Articles/Vol3Iss2/02_IJETMR16_A02_28.pdf

please read the attached file the line which started with ( in one form or anther,.....) i understand that it can be use T Gamma to calculate curving resistance.

The proposal is at first an idea. I have not test it, but it should work according to the ABAQUS manual. It is difficult to say something without the model. At first, friction and friction forces (requires a normal force and friction coefficient > 0) must really occur and generate heat energy. The heat energy can be controlled by the following key:

*Energy Output, elset=whole_model

ALLFD (Total energy dissipated through frictional effects)

Is the obtained temperature meaningful?

Hi Mendjhi,

In a way, I would disagree with the premise of your question. Developing countries rarely obtain the rights to host the sort of Mega Sport Events (e.g. Olympics, Commonwealth Games, FIFA World Cup) that require major upgrades to local transport and touristic infrastructure. Developing countries often host mid-tier regional or continental event, such as the African Games (e.g. Congo or Zambia), les Jeux de la Francophonie (Ivory Coast), or the Asian Indoor Games (Uzbekistan). These require infrastructure investment, but not to the scale you are talking about.

And I think this is a big gap in current research. How do these events (big, but not on the same scale as Olympics, Commonwealth and World Cup) impact so-called developing countries?

From my research, one thing that is clear is that these events can help enhance the human skills and professional networks of local sport organisations, but to truly maximize those returns, conscious planning and activities is needed. I suspect the same can be said for other areas, such as sport facilities.

A wonderful question and so forth

Thanks for the question and in my case thanks for bringing the CAPACITY paper to my attention. I think that you can see from the paper the large amount of careful and very detailed modeling that they did for a specific case study. It is unlikely that you can get an "off the shelf" version of this for your use, but I think the work done on the paper would provide a good guide for your efforts. Also the parameterization is specific to their case study, but if your case is similar (track geometry etc) you could replace their data with numbers from your case. Note too that they were a large team and this is a task, if you are starting from scratch, that would be a very big challenge for one person.

You could find one of the authors and see if they can offer any follow up?

Dear Abbasali Taghavi Ghalesari and Zainab Al-Khafaji ,

Is this the temperature in the rail?

This matter is discussed in the frame of p. 11 of the enclosed paper AJD 150F available on ResearchGate. Essentially, combinations of ports and hinterland modes are defined and a choice model estimated. The frame points to the correct and the incorrect ways to estimate the resulting share model in order to obtain coefficients that are truly independent of the choice of a reference mode as one applies a particular, well-known estimator..

Hi

Refer these papers

Recommend if answer is useful.

There are several methods available, bolting, clinching, riveting, adhesive bonding or heat conduction joining. All have their advantages and disadvantages.

connection and connectivity is the most complex task but very much attract passanger from cars to public transit mode.

Dear colleague,

The main parameters when you compare type of transport are operating costs, infrastructure paramters, type of rolling stoks, reliability and security. You can see also in my profile the papers about intermodal transport and classifing railway station - they may be useful in selecting assessment parameters.

Hi !

You can view some about in:

This is in spanish, and you can find formulas and other bibliography

Additionally You can view the comparison of different systems

Yes, it is very important to determine beforehand, which cost you are interested in??

yes...perturbation of initial perfect shape is how rough surface is made...also if you meant rough surface for contact, then friction is high for that (rough contact)

Please go through the below article which contains the useful references and information related to this question:

Second-order sliding mode controller with model reference adaptation for automatic train operation, Jun 2017, Vehicle System Dynamics, 10.1080/00423114.2017.1330482.

OEE would be the one of the best KPI's you can use.