Nonlinear state space model representation
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Hello everyone,
I would like to compute a continous-time nonlinear model using the state-space related blocks in Simulink (and NOT by using integrator blocks). The difficulties I've encountered were regarding setting up the state matrices: the state matrices (A,B,C) contained functions of the state variables, which I cannot define in the state space Simulink block, but are generated automatically.
I would appreciate very much any suggestions. Thanks.
Best regards, Cosmin
2 Comments
Stefan Raab
on 18 Apr 2016
Hello,
I'm afraid that the "State-Space" block does not support nonlinear matrix functions as the help says "Implement linear state-space system". So most likely you have to implement the nonlinear functions manually. Could you tell me why you don't want to use Integrator blocks? Maybe I can help you then.
Kind regards, Stefan
Answers (1)
Firas Omran
on 7 Oct 2017
Hello, Can you please tell me how you solved your problem because i am trying to build a nonlinear state space model with some random state space (rss command) and I cannot combine them together in one system.
Thanks Firas
2 Comments
Luis Martinez
on 27 Mar 2021
Ok so my system is reasonably complex (w/o linearizing it) , so my plan was to express my matrix A (in state space) as the jacobian matrix without evaluating at the operating point, since my feedback control desing will be in ss so basically i will design in linear and then add the feedback gain to the nonlinear simulink model , thats why i think the jaccobian is the right approach because i need to have a matrix A with the same dimensions as my feedback design. I am think of using "MATLAB function" to implement my A nonlinar jacobian matrix but im not sure on how to do this.
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