System identification miso models

Hi,
I want to know is it possible to identify the MISO and MIMO models using system identification toolkit?
I m using fieldpoint 2010. The program is running very slow inside the fieldpoint. so is it possible to divide the program in such a way that few compuations(which are less critical) run inside the computer and few inside the fieldpoint?
Regards,
Sai

Hi Ruser,
LabVIEW System Identification toolkit provides SI Convert to Models of CDT VI to convert a model you created in the LabVIEW System Identification Toolkit into a transfer function, zero-pole-gain, or state-space model that you can use with the LabVIEW Control Design and Simulation Module.

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Nonlinear system identification using neural network (black box model)

Hello, my thesis work is based on "suface EMG- angular acceleration modeling using different system identification techniques"......can anyone help me in doing nonlinear system identification using neural network...

Well, look at that. I actually had this problem before--and SOLVED it before! [facepalm] I'd forgotten all about it....
https://bbs.archlinux.org/viewtopic.php?id=140151
I just added "vmalloc=256" to my linux line, and X started right up!
[edit] Well, mythtv had the solution, as well: http://www.mythtv.org/wiki/Common_Probl … _too_small
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System identification for open loop unstable plant?

Hello,
I have been trying to use system identification on labview. My problem is that my plant is open loop unstable and none of the tutorials or examples I have found seem to cover this so I cannot get it to work. Does anyone have any suggestions as to how I should go about it? My plant has an RC servo so it needs a PWM signal to stimulate it.
Thanks
Adam

adamkse wrote:
I want to control my plant with lead/lag control but I do not know the plant model which makes this very difficult. I cannot theoretically calculate it because the information I need to obtain a numerical transfer function or state space model is unavailable.
I have it controlled with PID at the moment but this is not ideal.
I am trying to use the system identification toolkit to obtain a transfer function but I do not know what to do because the examples do not work for open loop unstable plants.
Adam
Ok Open loop unstable functions cannot be predictably controlled (hence the terms; open loop and unstable,) Not being able to model the actions is a bit of a problem too.
Somehow, someway you need to get some kind of model or some kind of feedback to either provide stability in the plant or close the loop.
Adding hardware (sensors) is the most likely solution.
tell me more about the plant, I do this kind of thing for a living, so I could offer some ideas.
Jeff

System Identification Assistant Signal Generator

Hello,
I am using a GW Instek power source to heat a graphite rod within a vacuum chamber. I am detecting the temperature with a K type thermocouple connected to a thermocouple input module. I have written a labview program with a PID and have everything running, yet i force tuned the PID. I would like to use the signal identification tools labview provides to identify the transfer function and model the process. I have used the system identification assitant in attempting to send a step signal and acquire a response, yet I have been running into difficulties. The only way I can perform a step function is to manually generate an output of a specified power and then measure the response, as the signal generator within the system identification software is not identifying the GW Instek PSW 30-108 power source. With manual input and importing both input and output data i am able to get a parametric model, yet the transfer function provide me PID values which are 5 orders of magnitude greater then the ones i am currently using. Ideally i would like to use the software to generate the signal and measure the response continuously rather then using data i collect through my program. If possible, I would also be interested in perhaps directly integrating VI's to perform signal analysis directly into my process program.
Problems and what I have done:
I have the drivers for the power source and my process program recognizes the device yet system ident assist cannot find the hardware. I have attempted to creat a task in NI-MAX yet the hardware is also non-identifiable.
Port module input works with VISA and this is how my VI is communicating with the power source.
Goals:
I would like to use the system ident assist to generate power ouput and collect temperature input, and generate a process model, so that I may tune my PID more accuratly.
Also, I may be interested in integrating VI's directly into my process program, yet I am new to the LV language...
I have attached my Labview program below. I would like to thank you in advance for your time and look forward to responses.
Cheers
Attachments:
Test1_RT.vi ‏186 KB

Double post, for further Information see http://forums.ni.com/t5/LabVIEW/System-Identification-Assistant-w-o-NI-Signal-Generator/m-p/3014731#...

System identification error 41263

hi...
can somebody please explain why i am getting an error "41263-The System Identification Toolkit cannot retrieve the data in system model because the model type you wire in is incompatible with the system model requirements. " while using model simulation vi to simulate an arx model i created using estimate arx model vi?

Hi ajaleelp,
Sorry for the delayed response on this, but I have a few questions for you. Are you just receiving this error at run-time? Meaning you have no broken wires or anything, but the VI stopsat the model simulation VI?
Also, have you tried our example for model simulation? You can find it here:
C\program files\national instruments\labview [version]\examples\System Identification\Getting
Started\General.llb
This actually uses the estimate arx and model simulation VIs. So, you should be able to see if that works, and then compare it to your system.
Hope this helps!
Chris Van Horn
Applications Engineer

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i have successfully implemented the RLS algorithm in labview, but i am having alot of trouble generating an input. at first i used a ptbypt sine input and wired it to my FIR Filter (win coeff ptbypt) and to my data queue (ptbypt) to generate U(n). When i plot the adjusted weights they give a perfect Sinc Function.
So, after this i add in a gaussian White noise VI (ptbypt) and add it's output with the output of the sine wave VI (ptbypt) and like before wire the output of the summation to the FIR Filter and the data queue point by point. The problem that is occurring is that my tap weights after becoming constant do not change. they are the same for when i enter the sine wave alone and when i enter the sine wave with the gaussina white noise, tap weights are same. they only change when i change the low cutoff of the FIR FIlter.
its would be very much appreciated if someone may help me solve this problem i am having. I made the RLS (for system identification) as Final Year Engineering Project.

the input is a sine wave , the sine wave passes through a system which incorporates a noise in it (we say the noise incorporated by the system is the Gaussian white noise) the corrupted input enters the system , the filter weights are adjusted by the algo, and a sine waveform is extracted filtering the noise.
what kind of LTI system. Can you please elaborate? and i cant switch to LMS my project is RLS.

System identification for power converter

Dear All,
i am working on system identification for the buck converter . for this i generated variable duty cycle with 20KHz switching frequency on analog output AO1 of usb 6221, now i want to introduce perturbation PRBS in steady state. now my problem is to add perturbation on analog output. please suggest me how to do this on analog output.
thanks
with regards
gurpreet singh

Do you want to mix some signal to your PWM signals? You can use normal add function to add your AO PWM signals with the PBRS perturbation signal.

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Hello,
can i install mountain lion operating system in Macpro 2014 model?
and currently operating system is mavrick.

Yes, if you've a DVD of mountain lion you can install it else download it and you can make a DVD...
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This question was solved.
View Solution.

neveo wrote:
I need to replace the system of my HP Pavillion dv9500 t laptop. the service manual provides two possible part numbers viz. one for a board "with 256MB of videp system memory for laptops with discrete video system memory" and a second where the 256MB is replaced by 128MB. I have a 512MB Nvidia GeFore8600M GS graphics card. So, which one is right for my system the part number with "256MB" of video system memory" or the the one with "128MB". System information tell me tha the board manufacturer is Quanta, system ID is 30CB and version is 79.2E
You need the 8P PM Intel system board. It is the
(14) With 256 MB of video system memory for use with computer models
with discrete video system memory HP p/n 447983-001
Best regards,
erico
****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer

Changing Default logical system names of a model.

Hi
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Hi shah kond,
you can change rfc destinations of model in 2 differnet ways.
firs one: right clcik on project
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Naidu

Ho to change the mapped System object to the Model to another System object

Hi All,
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Now i have created one more system object pointing to Otherclient. in R3. How make use of the same model pointing this new System object for working properly with out doing the complete development of that model.
I just want to map the existing model to new system object. Can any body tell me how to achieve this.
Regards
Vijay

Hi Vijay,
therefore you can use the Alias Manager (see attachment). There you can replace all other system aliases.
Best Regards,
Marcel

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Hello onfish,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that you are looking for the product and serial number to register your computer, and I would be happy to guide you towards a resolution!
To find your product, model, and serial number for your desktop, please take a look at this YouTube video:
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MechPilot
I work on behalf of HP
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System identifica​tion miso models

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System identification miso models