How to speed up simulink simulation including a simscape model ?

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lady bird 2018-11-6

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回答： Steve Miller 2019-4-1

Hello all;

How to change simulation frequency in a simulink model that includes a simscape multibody structure ?

Currently, i'm using variable-step solver ; with ODE 45. Relative tolerance 1e-3 time tolerance 10*128*eps algorithm adaptive

Because two slow i cannot see the motion in the mechanics explorer

Thank you Sincerely yours

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Nicolas Schmit 2018-12-12

I would suggest you first use the solver profiler to look for potential causes of slow simulation.

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Answer 1

Steve Miller 2019-4-1

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The solver profiler is a good option. It is very difficult to give general guidance as all models are different and have their own needs. Look at this video:

https://www.mathworks.com/videos/finding-causes-of-slow-simulations-73445.html

Settings you can try:

Try solver ode23t
Set your Zero-Crossing Algorithm back to non-adaptive and pay close attention to the diagnostics. If you need Adaptive for a Simscape Multibody model, you likely have some redundant zero-crossings that are making the step size quite small.

--Steve