Mimo simulation in Control Design & simulation toolbox

Hi,
I am running is simulation with MIMO system represented as state space in control design and simulation toolkit. I see that I am not able to give vector with 2 inputs to the MIMO model. By default state space is represented by a SISO model. Can anybody guide how can one give two inputs to the state space model and run it as a MIMO system.
Thanks and best regards,
Amit Kalyani

You should be able to double click on the State-Space VI which will bring up State-Space Configuration Dialog Window. You will be able to use the drop down Polymorphic instance to selec a MIMO system. Or another way of doing this is to change the parameter source to Terminal, then wire in your MIMO model directly.
Andy Chang
National Instruments
LabVIEW Control Design and Simulation

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Control design & simulation

Hi,
How do I use LabVIEW Control Design & Simulation to run a DLL-file on a RT-target(CompactRIO)? It would also be great to know how much MB RAM it is required on the RT-target.
Thanks in advance

One more bit of advice. You should really avoid using the feedback node on a simulation diagram. The feedback node will probably not behave like you want. The feedback node is fine outside the world of simulation. Use the memory block or the delay block from the simulation palette instead.
Here's a brief explanation of why it's bad. The feedback node maintains its own state that the simulation knows nothing about. In your case, you are using the RK4 solver. The RK4 solver takes three minor steps and then a major step. This means the diagram is executed four times per major step. If you were using the feedback node to increment by 0.1 on each step, you'd be quite surprised to find the feeback node outputing 0.4 instead of 0.1 after the first step. Also, with variable step solvers like RK23, the solver may reject a step and start over from the last step. The built in simulation functions work with the solver to roll their state back. However, the feedback node cannot do this as it was not built to be used within a simulation. Its own internal state is already committed and cannot be rolled back if a step is rejected in the simulation.

Control & Design Simulation Collector Problem

i had attempt to work out a collector in control & design simulation loop but i found that there is some problem
1. The data i collect is in horizontal form, how to change the data from horizontal to vertical?
2. The data i collect is not moving for the actual speed, did i collect data from wrong wire? Please correct me if i put wrong.
Thankyou very much
Solved!
Go to Solution.
Attachments:
1.xls ‏7 KB
DC motor control 3.vi ‏403 KB

Hi barp
Thanks for your reply, Erm for the second question, please take a look on the picture below. When the setpoint, desired speed is 500, the Actual Speed suppose osillating at 500 for instance (501, 502, 499), but in this case the actual speed is exactly 500, which is not the actual speed but is the desired speed.
My question is from the block diagram above, am i place the correct wire in the right way in order to collect the actual speed data?
and the solver is Runga-Kutta 1(Euler) is that same with Runga Kutta 1(RK1)?
Thankyou very much.

(Control Design & Simulation) State-Space block doesn't give output

I've tried and tried but can't get the State-Space block module to give me a graph / output.
I have no idea what the problem is and hope that somebody can help me. The numbers and calculations work in Matlab (Simulink) but i can't get it to simulate in labview.
Anybody got any ideas?
Solved!
Go to Solution.
Attachments:
Cavities.vi ‏30 KB
Matrixes.vi ‏27 KB

The problem is that you are assuming that LabVIEW executes left to right. Dataflow doesn't work this way. Your code as this:
does not tell LabVIEW that it has to execute everything from left to right. What is happening is that he is executing the 3 'island' of code in parallel and, in this case, it will have 'empty' values. You have to remove the local variables to make this work and dataflow paradigm will execute your code from left to right, as you want. here is the code:
Also, one more thing. Your input to the "CD Linear Simulation" is all zero. That means that you are trying to input zero input to a linear system, which will give you a zero output to the response. You probably do not want that since zero as input doesn't give you any more information. If you want to see how to system goes to zero after initial conditions, you should use "CD Initial Response". Or you should modify the input signal to the system. Please study this shipping example to understand how to use Linear Simulation and Initial Response:
C:\Program Files (x86)\National Instruments\LabVIEW 2012\examples\Control and Simulation\Control Design\Time Analysis\CDEx Time Domain Analysis.vi
Hope this helps...
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Instalacion de control design simulation module

He instalado el modulo de control design and simulation, pero en el progrma la paleta me sigue apareciendo vacia. Alguien sabria decirme por que no me aparecen las herramientas?
En el licence manager he comprobado que el modulo esta instalado correctamente.
Saludos.

duplicate
LabVIEW Champion . Do more with less code and in less time .

How can I use the Control Design & Simulation module in the Mobile (PDA) modul?

Hi everyone!
I have to create Bode and Nyquist plot from Transfer function on a PDA, but I can't use CD&S Modul when I'm opening a new Mobile project.
Thank you for your answer!
Sincerely yours,
Jenő Kocsis

Jenő Kocsis wrote:
Hi everyone!
I have to create Bode and Nyquist plot from Transfer function on a PDA, but I can't use CD&S Modul when I'm opening a new Mobile project.
Thank you for your answer!
Sincerely yours,
Jenő Kocsis
Does it have to any transfer function? Or is it some limitations
Besides which, my opinion is that Express VIs Carthage must be destroyed deleted
(Sorry no Labview "brag list" so far)

Control, design and simulation

Hello everybody,
I am trying to run a simulation in Control Design and Simulation module. My simulation consists of various simulation systems. The subsystems are working as desired when run as separate units, but when I run the complete system, the subsystems fail to produce the output values.
I have not used any local variables or any discrete function vi inside a subsystem.
Where am I wrong ? Any help would be much appreciated.

I mean the indicators connected to various subsystems are inactive and don't produce any output values. I tried to find the error using the Error Cluster, but it didn't show any error. I am using LabVIEW 2011. I have attached the complete system including the subsystems. The individual systems are working fine. I changed the solver too, but the problem persisted. Please try to identify the error.
Barp wrote:
When you say: Fail to produce a output, what do you mean?
On the right side of the Control and Simulation loop you have the 'Error Out' cluster. Create a control from it and see if you have an error. Also, which version of LabVIEW are you using?
If this is not producing an error, then try to change the solver you are using. It would help if you could post your code (or at least pictures) of it.
Attachments:
Wind Turbine Integrated.7z ‏2240 KB

Control Design and Simulation and DAQ

I'm learning Control Design and Simulations. I have some questions about it.
1. For System Identification use, we can find the transfer function/model of the system by feeding data measurement from the system. But, how long data do we need to be sufficent for Identification System to estimate the model? Until the get saturated value (steady state)? or any other intervals? What if the system is unstable? How will Identification System Toolkit estimate that case?
2. For connecting to hardware, we just connect the clock in the simulation loop to the hardware? And the simulation loop will simulate the blocks inside once it got the trigger/data from the DAQ? what about the step time and solver? Do they follow the timing from hardware? or they will run on their own supplied values/clock?if we use USB DAQ, we can't have any clock from it (as far as I know it's because USB connection is not that stable for clocking since it might be any jitters or delays.) So, how do we configure the timing parameter for USB DAQ?
3. There is possibility to convert model in transfer function to state space, how do we know the states inside that conversion?
Any helps would be great...
Thanks in advance...

Dear Chin ho,
After going through your questions I found some documentation which will be useful for you. But I you still have more questions, you can reply me any time.
1- About the data and amount of it I couldn't find any info but maybe you can use the new functions in LV version 2009 and find your answer.
Estimating States of Nonlinear Stochastic State-Space Models with Extended Kalman Filters
In previous versions of the LabVIEW Control Design and Simulation Module, you can use the Discrete Kalman Filter function and the Continuous Kalman Filter function to estimate the states of a linear discrete or linear continuous stochastic state-space model, respectively. In the LabVIEW 2009 Control Design and Simulation Module, you can use the Continuous Extended Kalman Filter function and the Discrete Extended Kalman Filter function to estimate the states of a nonlinear continuous or a nonlinear discrete stochastic state-space model, respectively.
The Continuous Extended Kalman Filter function and the Discrete Extended Kalman Filter function estimate model states of a partially observable plant based on noisy measurements. First, use the SIM Discrete Nonlinear Plant Model template VI or the SIM Continuous Nonlinear Plant Model template VI, located in the labview\templates\Control and Simulation directory, to define the system model. Then use the the Discrete Nonlinear Noisy Plant function or the Continuous Nonlinear Noisy Plant function to simulate the discrete or continuous nonlinear model, respectively, with the addition of noise. Finally, use the Continuous Extended Kalman Filter function or the Discrete Extended Kalman Filter function to estimate the states of your model.
The Continuous Extended Kalman Filter function and the Discrete Extended Kalman Filter function linearize the nonlinear system either by calculating a Jacobian matrix internally or by using an external Jacobian matrix that you define. Use the SIM Continuous Jacobians template VI or the SIM Discrete Jacobians template VI, located in the labview\templates\Control and Simulation directory, to define an external Jacobian matrix.
Refer to the LabVIEW Control Design User Manual, accessible by navigating to the labview\manuals directory and opening CD_User_Manual.pdf, for more information about estimating the states of nonlinear stochastic state-space models with extended Kalman filters.
2- I think that I found a pdf document about this part of your question which will be helpful. If you would like to give your email address, I can send it to you.
3- About this part you can check the help function in LabVIEW when you open the "CD Convert Transfer function To State-space" function in your front panel.
I pasted some info about the mathematic part below.
The LabVIEW Control Design and Simulation Module provides tools to study the dynamics of systems described by linear time-invariant (LTI) continuous and discrete models. You can create deterministic state-space, transfer function, and zero-pole-gain models. You also can create stochastic state-space models and the second-order statistics noise models. You can use these forms to describe both single-input single-output (SISO) and multiple-input multiple-output (MIMO) systems.
Continuous transfer function and zero-pole-gain models use the s variable to define time, whereas discrete transfer function and zero-pole-gain models use the z variable to define time. Continuous state-space models use the t variable to define time, whereas discrete state-space models use the k variable to define time.
Deterministic State-Space Model
Continuous
x(t) = Ax("t) + Bu(t)
y(t) = Cx(t) + Du(t)
Discrete
x(k + 1) = Ax(k) + Bu(k)
y(k) = Cx(k) + Du(k)
Stochastic State-Space Model
Continuous
x(t) = Ax(t) + Bu(t) + Gw(t)
y(t) = Cx(t) + Du(t) + Hw(t) + v(t)
Discrete
x(k + 1) = Ax(k) + Bu(k) + Gw(k)
y(k) = Cx(k) + Du(k) + Hw(k) + v(k)
Second-Order Statistics Noise Model
Q = E{w . wT} – E{w} . ET{w}
R = E{v . vT} – E{v} . ET{v}
N = E{w . vT} – E{w} . ET{v}
where
t is continuous time.
k is the model sampling time multiplied by the discrete time step, where the discrete time step equals 0, 1, 2, …
x is the model state vector.
u is the model input vector.
y is the model output vector.
w is the process noise vector.
v is the measurement noise vector.
A is an n × n state matrix of the given model.
B is an n × m input matrix of the given model.
C is an r × n output matrix of the given model.
D is an r × m direct transmission matrix of the given model.
n is the number of model states.
m is the number of model inputs.
r is the number of model outputs.
G is a matrix relating w to the model states.
H is a matrix relating w to the model outputs.
Q is the auto-covariance matrix of w.
R is the auto-covariance matrix of v.
N is the cross-covariance matrix between w and v.
E{} denotes the expected value or the mean of the enclosed term(s).

How to make my waveform in control and design simulation run continuously?

Hi all, i m a begineer of Labview and have some question to ask.
I am using the Labview to design and implement a controller for FOPTD system, but i found that the waveform in the "control and simulation loop" is not running continuously. I mean it keep repeat in the same graph from 0 to 10second. Is there any approach to make it run continuously?
Thankyou very much.
Solved!
Go to Solution.
Attachments:
Project 1.png ‏12 KB
Project 2.png ‏18 KB

Well, my suggestion then is to do the following: change final time from Inf back to 10 s (or whatever number that capture the whole simulation) and do a while loop around the Control and Simulation Loop with a "wait until next ms" function to give you time to react and change parameters, like this below. This would make LabVIEW to do the whole simulation, wait for 1000 ms and then, run the simulation again with new parameters. If you need more time, just need to change the constant wired to the "wait until next milisecond".
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Control design and simulation module

Hi,
I am new to Labview and i am trying to work on Control System design. I have downloaded and installed the Evaluation Module of Control Design and Simulation Module. The problem I am facing witht this is its not showing any control fuctions in functions Palette. While installing it said its installing only control design and simulation assistant. Please, can anyone help with this.
I am actually looking at this module to implement Sliding mode control for non linear systems. I would like to know if there are any examples to implement this??
Thank You.

Hello
The problem is the following. The version of LabVIEW that you are using does not match the version of the evaluation version of LabVIEW Control Design and Simulation Module (CD&SIM). If that happens, the installer will not select the support files for your LabVIEW. If you download LabVIEW 2011, then you must install CD&SIM 2011.
Now, the module in the current version does not have an example with sliding mode control. But using this module, you can easily implement the algorithms and simulation its result using the Control and Simulation Loop.
Hope this helps.
Barp - Control and Simulation Group - LabVIEW R&D - National Instruments

Control design and simulation palette

Hi all
I've recently installed LV 8.2 professional edition on my PC.
Watching the function palette i've seen the sub-palette 'Control design and simulation' empty... Is it normal? Do i need some toolkit to see something in it?
King regards
I love the smell of napalm in the morning

alij wrote:
its because the main labview is install in c:\program files , but when you install the module it will install in programfiles(x86) ,that because the **bleep**ing bug in the installation and programmers , plz fixx this , i think you have to copy paste files into the main NI labview which is in program files not program files (x86)...
If LabVIEW is installed in "c:\program files", it means that you installed LabVIEW 64bit. You should install LabVIEW 32bit, which will go to "c:\program files(x86)" and will be compatible with your toolkit.
There is nothing wrong with the installer. You simply picked the wrong product.
Do NOT copy files between the two mentioned folders. One is for 32bit applications and one is for 64bit applications (assuming you have a 64bit OS).
The toolkit is not compatible with 64bit LabVIEW (Details).
LabVIEW Champion . Do more with less code and in less time .

Control Design and Simulation Tutorial

Hi
I'm starting off with a coursework which requires use of the Control Design and Simulation functions. Before I ask any silly questions i'd like to see the hand on tutorial, it's referenced in this white paper.
http://www.ni.com/white-paper/5855/en/
However the ftp link to the tutorial doesn't work, does anyone else have an alternative link, or could supply the tutorial directly.
I appreciate any assistance.
Kind Regards
Danny
Solved!
Go to Solution.

Hmm, thanks. It must've been the proxy server in the office. Disabled and it downloaded it via the wifi.
Thanks

Control Design and Simulation palette doesn't appear

I'm using LabVIEW 2009 in Professional License. I've installed Control Design and Simulation Module with its all other required Toolkits. The problem is that Control Design and Simulation palette doesn't appear in the Functions Palette in any VI. Please help me with that.
Adeel Amin
NED University of Engineering & Technology
Solved!
Go to Solution.

If you run NI License Manager, Expand LabVIEW2009>Modules>Control Design and Simulation.Can you verify that you have that directory and what is the color of the cube right next to it?
Andy Chang
National Instruments
LabVIEW Control Design and Simulation

Design control and simulation palette

After hitting Next bottoms and succesfully installation for Design control and simulation toolkit , when I launchำก Labview programme there is nothing in this function and the palette is blank. Anyone knows what happen. I use Labview 2013 student edition 64 bit(free 6 months version). Thanks in advance+++
Solved!
Go to Solution.

Do you truely have the 64bit version of LabVIEw installed?
If you do, then you will not be able to use this module.
It is only valid for 32bit LabVIEW.
You can see the system requirements here:
http://www.ni.com/labview/requirements/#cds
You can try to install 32bit version of LabVIEW and then install the module.

No lo puedo instalar labview 2011 Control Design and Simulation

no e podido encontrar la verision para instalarlo agradezco si alguien me puede ayudar y guiar en la instalacion

Hola, [email protected]
Gracias por utilizar los foros de discusión, en el siguiente link puedes descargar el módulo LabVIEW Control Design and Simulation 2011.
www.ni.com/download/labview-control-design-and-simulation-module-2011/2554/en/
¡Saludos!
David P.
National Instruments
Ingeniería de Aplicaciones
www.ni.com/soporte
David P.
National Instruments
Applications Engineer
www.ni.com/soporte

Mimo simulation in Control Design & simulation toolbox

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