How do I find out the ODE function that the solver in Simulink uses?

2015 8 13
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更新时间：2015 8 18
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I would like to find out the ODE function that the "ode45 (Dormand-Prince)" solver in Simulink uses. When I call the MATLAB function "ode45", the input argument requests for a ODE function that describes the system.
However in Simulink, it doesn't tell me the ODE function it uses. Is there any way to find out?

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Sainath Varikuti
Sainath Varikuti 2015-8-17

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Hi Lin,
In Simulink a dynamic system is represented as states. Therefore, it is not possible to get the mathematical representation of ODE function directly. However, you can obtain the state-space representation of Simulink model using Simulink Control Design as discussed here . The state-space object will give us the system dynamics.
Regards,
Sainath.

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ml Lin
ml Lin 2015-8-18
Hi Sainath,
Thanks for the reply. I see. But how does Simulink compute the states during every iteration without knowing the mathematical representation of the ODE?
What I don't understand is that, for Simulink to obtain the state space representation, wouldn't it need to know the system dynamics first?
Or is there some technique involve that I am not aware of?
Regards, Lin

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2015-8-13

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