How to speed up simulink simulation including a simscape model ?

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

[Nicolas Schmit]

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

Answer 1

[Steve Miller]

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:

1. Try solver ode23t
2. 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