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# Control - Science topic

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Questions related to Control

In his name is the judge

Hi

There is a fuzzy logic control system in python. The system contain 2 inouts and 18 outputs.

inference of system is mamdani and shape function used to be guassian.

Then in term of refine performance of the controller I need to optimize specifications belong to shape functions of both input and output. In order to that I need to use multi objective optimization.

We have 2 input and 1 output in case of this problem. I have developed 3 shape functions for each entrance and 3 for output and the shape function is gaussian so we have 18 parameters totally.

I defined my problem as a function in python. But notice this I there is not any clear relationship between input and output of function. It’s just a function which is so complicated with 2 inputs and 18 outputs.

I made my decision to use NSGAII algorithm and I really don't want to change the algorithm.

So I try every way to optimize my function but I didn’t find any success. By searching about python library which can do multiobjective optimization I find Pymoo as the best solution but I really failed to optimize my function which is complicated custom function, with it.

So It’s really my pleasure if you can introduce me a library in python or suggest me a way that I can use Pymoo in order to this aim.

wish you best

Take refuge in the right.

Dear Good people,

Is it applicable to perform in vitro assays on a Particular cancer cell line that differs from a normal cell line?

for example to work on colon cancer cell line and have normal liver cell line as a control!

Thanks In advance

What are the types of controls needed when using LIVE/DEAD viability kit (PI and SYTO9) to quantify bacteria in flow cytometry and what is the function of each?

Also welcome to recommend papers on this for my writing.

Dear all,

I have a question about how to optimally determine the value of active power droop gain mp in islanded microgrid which shares a certain load.

I use this formula: w=wnominal -mp*p and I put P=the load connected to each inverter and I assume the value of w which is the minimum frequency that I do not want to go below it and from these values I calculate mp. Are these steps correct ?

I am using SIMULINK software and I would like to know how to determine the power rating of each VSI and if that is related to the DC link voltage. what is the criteria to choose the values of mp and nq to share the connected load between the different DGs ?

In his name is the judge

Hi

for using matlab facilities especially matlab controller like fuzzy have to sending and receiving data between matlab and opensees, in fact i want send two data as fuzzy controller form opensees to matlab after each time history step in opensees and then matlab send back one output to opensees.

to achieve this i have to connect matlab and opensees with openfresco it means i do hybrid simulation.

first is this possible to do this?

second is there any one do work like this, do hybrid simulation generally or specifically do hybrid simulation between matlab and opensees. if yes i am very thankful to share work with me or for some aim.

have to say i prefer not to use openseespy and i almost read all example and guide in openfresco site and even on each site but i cant do this right.

Any help is greatly appreciated.

Take refuge in the right.

What is event triggered control?

Is there any books that explains it in details.

Is it possible that at "some moments" the calculation time of loop or algorithm increases more than the sampling time of the system ??

or it is completely wrong ?!!

In his name is the judge

Hi everyone

In order to use controller for structure with absorber, have to connect matlab and opensees in real time :

it means in each loop in opensees data must send to matlab and then matlab do some prossess with controller like fuzzy then send back data to opensees

Relying on researching and consulting the only way is use hybrid simulation (like openfresco),

do you have any other idea or way to connect these two programs without using openfresco?

Translation results

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Consult

Wish you best.

Take refuge in the right.

Hi there,

I am looking at the technical reasons why torque control is better then position control for biped, quadruped...

If the research gate community can provide insights I iwll greatly appreciate

thank you very much

The chrome azurol sulphonate media has been prepared following the method covered in Schwyn and Neiland's 1987 publication titled "Universal chemical assay for the detection and determination of siderophores".

Need a control that can grow on the CAS Agar but does NOT produce siderophores, the reason being so we can determine if any color change is truly from siderophore chelation and not another type of chemical breakdown.

The concentration of HDTMA in the CAS media is toxic to gram-positive bacteria and fungi.

I only have access to BSL 1 and BSL 2 labs.

In his name is the judge

Hi

In order to design controler for my damper ( wich is tlcgd), i want to use fuzzy system.

So i have to optimize rules for fuzzy controler. i want to know for optimizition rules of fuzzy systems wich one is the best genetiz algorithm or Artificial neural network?

Wish you best

Take refuge in the right.

I have just designed a fuzzy system, and now I want to redesign it based on the fractional order. However, I have no idea where to start from and what to do. Could you please tell me what I should do and mention any related sources to study?

I am looking for information about non-chemical control methods of invasive species in Europe. Thanks for your help.

I have tried the methods of institutes in Nurmberg/Erlangen and Torino, but get failures to the worths of Ld(id,iq) and Lq(id,iq) the producer gives to us.

I want to create a Lookup-Tables of Ld(id,iq),Lq(id,iq), PsiPM(id,iq).

As we know, the watershed of the optimal problem is convexity and non-convexity. So, what is the watershed of control problem?

RNA input without adding the anti-m6A antibody would be enough?

Thank you in advance,

Alexandre Magno Vicente

Has prescribed convergence superiority compared to fixed-time convergence? In light of the fact that fixed-time convergence can do so.

I have made two controls and exposed them to the same conditions , but I found a problem in which that one is smeared and the other is not.

Condition : 20 min under UV radiation then incubation for 3 hr. in water bath 37c then I have loaded the sample .

Can UV make this change ?

Does UV has a random effect?

The controls contains cDNA

Today,

**sensors**are usually interpreted as devices which convert different sorts of**quantities**(e.g. pressure, light intensity, temperature, acceleration, humidity, etc.), into an**electrical**quantity (e.g. current, voltage, charge, resistance, capacitance, etc.), which make them useful to detect the*states*or*changes*of events of the real world in order to convey the information to the relevant**electronic circuits**(which perform the signal processing and computation tasks required for control, decision taking, data storage, etc.).If we think in a simple way, we can assume that

**actuators**work the opposite direction to avail an "action" interface between the signal processing circuits and the real world.If the signal processing and computation becomes based on

**"light" signals**instead of**electrical signals**, we may need to replace today's sensors and actuators with some others (and probably the sensor and actuator definitions will also be modified).*Let's assume a case that we need to convert***pressure**to**light**: One can prefer the simplest (**hybrid**) approach, which is to use a**pressure sensor**and then an**electrical-to-optical**transducer (.e.g. an**LED**) for obtaining the required**new type**of sensor. However, instead of this**indirect***conversion, if a more efficient or faster***direct****pressure-to-light**converter (**new type**of pressure sensor) is available, it might be more favorable. In near future, we may need to use such**direct***transducer devices for low-noise and/or high-speed realizations.*

(

*The example may not be a proper one but I just needed to provide a scenario. If you can provide better examples, you are welcome*)Most probably there are research studies ongoing in these fields, but I am not familiar with them. I would like to know about your thoughts and/or your information about this issue.

Is there a practical MATLAB implementation for controller synthesis?

hello,

i work on a controlled Microgrid and i want to test the robustness of my controller againt a white noise that may be added to the output or the input. Is there is any specific condition to follow in order to take a good choise of a noise power ? or it is somthing random ?

- Actually i tried to take it about 3% of the nominal measurement value, is this enough to be good choice ?

- in addition, i tried the two types of noises, but i noticed that the one applied on the output affects much more the system than the one applied on the output (in such a way, my system looses its stability with the output noise, but gives an acceptable performance with the input noise ) , is this reasonnable ? if yes, why ?

thank you in advance

Generic schematic is shown below for understanding.

Answer to the aforesaid question is requested from the experts, while considering the power flow equation i.e P = [Vs*Vr*Sin(theeta)]/X

If the data that can be observed is only the data set point or reference point and the output data from the close loop system, then the transfer function that can be identified is only the close loop system, without knowing the type of control used, is there a way to predict the transfer function of the plant??

Hello, Can we find Kp, Ki, and Kd values of PID, Lead-lag, or Type2/Type3 compensator? I have designed a type2 compensator for my system but now I need a PID controller for the same system can I access Kp and Ki values from the Type2 compensator? Please guide me

Regards

I'm try to conect a MFC card edge brooks 5850e at the control box 0254 brooks... somebody have a skecht about the connections (mfc card edge to box control) and if the brooks 0254 cotnrol need a special power supply. In thats moment my 0254 work with a 24V power supply.

Thanks and good day.

I am running a real-time hybrid simulation by using an electric linear motor. I am trying to perform the free vibration test and in this process, I am measuring the inertia force of the specimen with a load cell. If I do not feed the force in the system it becomes a cyclic test. Under the cyclic test, the system delay is around 2ms and the measured frequency and the input frequency are the same and no damping is observed. However, When I am feeding the measured force into the system then observing a higher delay around 10/12ms and a higher frequency than the input frequency. Can anyone help me with the problem?

I have implemented a 3-Ph PLL block in simulink as shown in the picture. The output contains a lot of spikes. Can anyone try to explain why I am getting the spikes?

The problem is this: there is model of robot, created in Simscape.
And knee of this robot is made of "pin-slot-joint", which allows one transnational and one rotational degree of freedom.
In transnational motion, it is imposed the stiffness and damping factor, which gives influence also to rotational torque.
My aim is to write optimization or control algorithm in such a way that this algorithm should provide such stiffness(in linear direction), which will reduce the rotational torque.
By the way, rotational reference motion of knee is provided in advance(as input), and appropriate torque is computed inside of the joint by inverse dynamics.
But to create such algorithm, I have no deep information about block dynamics, because block is provided by simscape, and the source code and other information is hidden.
By having signals of input stiffness, input motion, and output torque, I need to optimize the torque.
I will be truly grateful if you suggest me something.
(I tried to obtain equation, by using my knowledge in mechanics, but there are lots of details are needed such as the mass of the joint actuator, it's radius, the length of the spring and etc. AND I HAVE NO THIS INFORMATION.)
If you suggest me something, I will be truly grateful.

I'v used some matlab functions (based on mfiles) in my simulink. In order to decrease simulink running time I want to replace these blocks with a new toolbox.

My real system (buck converter) can only take an input of 0 to 1 (duty ratio) and I need to constrain the system so the controller action keeps within this bounds. How can I do this?

The code for the project is below in three images, it is Steve bruntons genetic algorithm coding. https://youtu.be/S5C_z1nVaSg?t=470

I assume the u variable is the duty ratio but I am not sure.

The last image is the control system attempted to be controlled. The transfer function is an adequate fit for the system.

Thanks in advance, if anymore information is desired please ask away.

Hi everyone,

I am writing a research proposal for my masters applications and am in dire need of guidance.

I suggest to quantitatively investigate the potential correlation between feminist attitudes and support of antiracism, so that the higher one's feminist attitudes is hypothesized to predict a stronger support for the recent Black Lives Matter movement.

I think it would make a lot of sense to control for various sociodemographic factors such as political leaning and race, however, to what extent do I need to expand on the rationale behind this decision in my proposal? I am already running over the word limit and really cannot afford to justify it thoroughly in my literature review...How much would it require me to show that those factors have been found to influence feminist attitudes & support for antiracism if I want to include them? Is it necessary that the covariate influences both variables, or is its effect on 1 of them enough to control for it?

Alternatively, how problematic would it be for me not to control for those variables? Would it affect the quality of my proposal?

Thanks a lot for your help! Looking forward to reading your thoughts on this.

Hi all,

Currently, I'm working on my Thesis as applying a Multi-Objective Optimization method on a MIMO system, so error (IAE) of outputs become minimum. Average and tolerance of IAE is chosen as objective function.

First, just main outputs (Y1 and Y2) have been considered to optimizing. But there were some answers which have a bad interaction although their main-outputs seems great. Probably because outputs cancel each other out, so there is not any sign in main-outputs.

Now my question is:

Is it right to consider main (Y1,Y2) and sub-outputs(Y12,Y21) together as optimization objective?

Can i claim that Controller is handling interaction between loops and error of Outputs simultaneously ?

I wonder if the positive control primers and probes authorized by the US CDC for amplifying human RNAse P are specific to the RNAse P chromosomal DNA. My thought process is that if primers are created that are specific to cDNA for RNAse P (i.e. the primer crosses a region between two exons, eliminating it's ability to bind to the chormosomal gene) then those primers could be used to validate the reverse transcription step in RT-PCR.

#covid19 #RT-qPCR #diagnostics

It's a question you created to reveal the hidden tools of control in the classroom.

The Coriolis matrix S(q,q') in the Lagrangian formulation is a coupled n*1 matrix. But in many mathematical models, an n*n Coriolis matrix S(q,q') multiplied by q' is used. I need to understand how to transform the former into later. Also, are the q and q' values in the matrix, the desired values, or the instantaneous values?

Cultivation of off-season vegetables are required controle condition in poly houses. Have any cost effective or supplementary techniques to reduce the cost of production?

Dear all,

Can you please tell me the ways to measure differential pressures across utility sides of the heat exchangers.

Unlike process side, the utility side pressure drops may not be measured. What can be done in such cases ? Are there indirect ways to measure it?

Thank you.

PID controller is reportedly widely built and used in control systems engineering for industrial applications. The PID-controller has a transfer function as: (Kd*s^2+Kp*s+Ki)/s.

Therefore, it seems such a transfer function box, could be built in terms of an electronic circuit component.

Meanwhile, the order of an observer-based controller is higher than a PID-controller, as for example you see in the snap-shot from Ogata control engineering book, attached. Since Ogata is a practical engineering text-book, therefore I guess such an observer-based controller could be practically built as an electronic circuit and then embedded as a controller.

Moreover, we usually build transfer function blocks, simply in Matlab Simulink. But is it possible, practical, simple, and convenient to build such blocks as an integrated electronic element in a circuit, while they are of high order?

**My main question:**

There is a controller, with a transfer-function:

H_controller(s)=N(s)/D(s),

Where:

N(s)=b0*s^m+b1*s^(m-1)+b2*s^(m-2)+…+bm,

And:

D(s)=a0*s^n+a1*s^(n-1)+a2*s^(n-2)+…+an.

Moreover, m=10, n=10, or, n=11.

**The digested question:**

Is it possible, and practical to design an electronic circuitry for a box, with the transfer function: H_box=H_controller(s)=N(s)/D(s)

**?****Warning:**I have no experience to build a real electronic circuitry, and my question is only the possibility and practicality of designing a circuit for such a transfer function box. Do not mind about the performance of the controller or any other stability concern with regard to that. Only the possibility and practicality of designing an electronic box which has an equivalent transfer function: H_box=H_controller(s)=N(s)/D(s).

The box is in feed-forward path.

Dear colleagues, friends, and professors,

As we know, we have very strong analytical approaches to control theory. Any dynamic decision-making process that its variables change in time could be characterized by state-space and/or state-action representations. However, we see very few control viewpoints for solving electricity market problems. I would like to invite you to share your thoughts about the opportunities, and limitations of such a viewpoint.

Thank you and kind regards,

Reza.

Hi I have a data set of S&P 500 companies for 20 years. I am testing for mediation in Stata and wanted to add further control variables to my set up:

Dear scientists,

When should we have sham in mtt assay?

What is the sham dose?

How should we use its data for mtt assay analysis?

I heard that if my drug solvent is PBS should take a dose of it and add to my cells like control, is it correct?

Hi everyone,

I hope you are well today,

OK, let me go straight forward, I really like to implement the new control techniques, but I'm having to much problem in the concepts,

**it will be really helpful if I can see some codes about RL in Control Theory.**So I will be really thankful if you can share me some

**codes**, whether you wrote it or you see them somewhere else.Thanks a lot,

Sincerely,

*Arash*.

I didn't find a chapter about the nonlinear system in MRAS authentic books. It would be appreciated if you could help me with this.

Dear friend,

These days, I'm trying to finish my Ph.D. in electrical engineering (control engineering). I'm specialized in Extended-Kalman fitter application, fault detection, neural network, digital transportation, digital twins and machine learning respectively. It is necessary to say that, my thesis about

**industry 4.0 at pipeline performance management (software)**. I'm enthusiastic to join a team for my postdoc. And I struggle to study at the edge of science topics for my postdoc.Would you help me please to join in the on the team for my postdoc, study abroad or a way to join in this kind of program?

Is ECU connected to can? Can we program it through AUTOSAR?

And if we have up to 70's ECU in car so it means we don't have a brain here?

What is sbw-Center ECU then?

Hello dear academicians,

I control my system with a LQR . My input (u) is torque produced by 3 reaction wheels. These wheels are connected to DC Motors. Reaction wheels inertias are already added as a B matrix without motors. I want to integrate the wheel's DC Motor's dynamic model into the system. But I am confused a lot. You can see my system's Simulink diagram below.

Can you help me please?

Sincerely.

I have data from several different frequency responses of the same open-loop system. This data has been put together to plot a Bode plot and Nyquist plot using MATLAB. I now need to find a transfer function that best represents the system. How would I go about deriving the transfer function? It can be done mathematically or using MATLAB, or trial and error though this is the less favourable approach.

I need to trial at least 1 first order and 1 second order transfer function using their standard forms to find which is the most suitable.

Dear ResaerchGate Members,

I would like to check the observability and controlability of a system that has 200 states. When I use the conventional method ofobservability based rank, the Matrix of A^(n-1) (A^199 , where A has 200x200 arrays) will have the array of infinity.

I would be thankful to have your recommendations?

Best regards, Reza

#Observability ; #Controlability ; #Control

control Coronavirus infection

While most governments try to hide the facts and manipulate statistics about COVOD-19 due to political/economical/stupidity reasons, many physicians and scientists are currently working on finding cures for COVOD-19. I am curious whether there is any center/platform to use experts from different areas of research in this fight.

To be clearer, let me ask this:

I work in biomedical engineering department. I, my colleagues and our students are familiar with optimization, data analysis, artificial intelligence, time-series analysis, modeling, control and …

I hope there might be a center which can provide some data, plus some tasks, so we can do some real and useful research and have a share in this fight.

Just a saying: maybe a proper deep neural network can suggest best combination of drugs according to the available history.

-----------------------

P.S.

My question is about the direct fight. I don’t mean helping in e.g. producing masks, cloths and …

Hello,

I am using a BLDC motor and I am controlling it with Field Oriented Control method.

I would like to tune my PI current and PID speed control loops but I don't know how.

Could you explain me how to do it or give me some links which could help me?

I have already searched but I am a bit lost.

Thank you in advance for your help.

I want to disable PI controller action for some time when certain if-else conditions are satisfied. I tried using the reset option but it's not suppose to achieve my objective I guess; it just resets the integrator action.

Regards,

I want to learn how to imlement any optimization algorithm that is not in the Matlab Toolbox in the S-Function block in Simulink.I want to do this with matlab codes, not in languages like C, C ++. (So I want to do it with the first type S-function).

For me it is necessary to add MPC controller in order to regulate (minimize) power in pin slot joint, produced by torque. But the problem is: How to understand the dynamic function of internal mechanics in Pin Slot Joint?

In the P-f Droop control strategy for a three-phase Voltage Source Inverter using ABC-dq0, why is the current measured before as well as after the filter circuit or in other words why is the current before filtration taken as a parameter?

Is there any alternative to avoid measuring the current before the filter if one used a different inverter topology (like Z source converters)?

Figure source: Bouzid, A.E., Sicard, P., Yamane, A., & Paquin, J. (2016). Simulation of droop control strategy for parallel inverters in autonomous AC microgrids.

*2016 8th International Conference on Modelling, Identification, and Control (ICMIC)*, 701-706.Are the dominant economic and political forces seeking to create similar patterns of knowledge and ideas to create similar patterns of behaviors that serve their interests?

Dear friend,

These days, I'm trying to finish my Ph.D. in electrical engineering (control engineering). I'm specialized in Extended-Kalman fitter application, fault detection, neural network, digital transportation, digital twins and machine learning respectively. It is necessary to say that, my thesis about

**Industry 4.0 at pipeline performance management (software).**I'm enthusiastic to join a team for my postdoc. And I struggle to study at the edge of science topics for my postdoc.Would you help me please to join in the on the team for my postdoc, study abroad or a way to join in this kind of program?

Dear friend

I want to design software for measuring the valuable information (pressure and flow) of the pipeline to detect faults like corrosion and leakage.

I'm working on the algorithm that used for extended kalman filter for pipeline leak detection systems.

I follow the low-priced method to design this kind of hardware for pipeline fault detection. Could you tell me some approaches to designing? Which instrument need for fabrication which doesn’t need expensive devices?

Thank you for your consideration

What is the best way to tune cascaded PI controllers? Take decoupled current-mode control in three-phase inverters as an example.

I am working on Power system modles in MATLAB with some adaptive controllers. The simulation run for different time duration like 8,10, and 15 sec. Now i need to get the computational time taken by the computer to solve the iteration behind theses simulations. I found tic and toc command but need more detailed explanation to use it. Thanks

Hi all,

What reference strains that I can use as a positive control for detecting fluoroquinolone-resistance genes?

Thank you in advance.

What's the similarity of these systems? How can I identify them?

Hello !

I am doing a research about input shaping control in crane system.

The picture below shows that the nonlinear crane system and the input shaping filter I set, and the output are position and angle, input shaping filter can effectively reduce the swing angle when it move to the position I command.

Here is my question :

The input shaping parameter are calculated from the linear system, so it's not complete in nonlinear. So I want to use the optimization function to find the input shaping parameter.

How could I use GA to find the parameter of the filter I design in simulink ?

Thanks.

Ray.

I have been trying to simulate my system whose Simulink schematic is attached, and also I have attached my results.

The issue is, even though the wind is having sufficient generation, the power demand of the load is not absorbed from the wind, instead, the grid instantly delivers the power. My system comprises of PMSG based wind generator, Battery, Load Connected before the Isolation Transformer and Grid.

Can you please suggest where I am going wrong? I want the power of the load must be supplied by the wind generator. (my results are attached)

But when i just increased the controller gains by a fold of 100 the system was seem to be controlled. The system was measured with a difference of (0.002 milliseconds)

How measure the settling and rising time of a sine wave signal ?

if I have a output signal that should be sine wave or whatever .. during the transient period at the beginning, I need to measure the rising and settling time .. how I can do that ?

Dear Researchers,

I would like to kindly ask to introduce different fuzzy-based hybrid control algorithms and the salient features of each technique.

Thank you.

What analysis tool is most suitable for transient-state analysis and designing control to mitigate those transients in power distribution system? I am planning to carry out transient analysis caused by sudden increase in load on distribution feeder and want to control those transient by charging/discharging the battery storage system. Our load has a high ramp rate and high magnitude which could cause these transients in the distribution grid voltage profile.

Regards