open loop response for nonlinear system

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ojonugwa adukwu
ojonugwa adukwu 2019-8-14
评论： ojonugwa adukwu 2019-8-15
Good day everyone. How do I simulate nonlinear system in open loop in matlab? I have this nonlinear system and I want to observe the response before applying controller. How do I do that? Please help with the code. Thanks.

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Jon
Jon 2019-8-14
Basically you need to define the set of ODE's (ordinary differential equations) that define your system and then solve them. MATLAB has many routines for solving ODE's, Please see the documentation at https://www.mathworks.com/help/matlab/ordinary-differential-equations.html?s_tid=CRUX_lftnav
After you have attempted to code up a solution, if you are still having problems, please attach your code and explain the specific problems you are encountering.
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ojonugwa adukwu
ojonugwa adukwu 2019-8-14
Oh Great! Let me try that now. I will get back when I have made headway.
Many thanks
Jon
Jon 2019-8-14
编辑：Jon 2019-8-14
It is little bit tricky to apply your input vector to the system of equations. One approach is explained in https://www.mathworks.com/help/matlab/ref/ode45.html in the example ODE with Time-Dependent Terms
I assume you do not have Simulink. In Simulink you can do everything with block diagrams and it is very straight forward to drive your blocks with a known input vector.

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ojonugwa adukwu
ojonugwa adukwu 2019-8-15
Good day. Sorry this is coming late. I have been able to use ode45 to simulate the open loop response of my system.
Many thanks for your expalnation. It was helpful.
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Jon
Jon 2019-8-15
Thank you, good luck with your project

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