Problem with double derivative

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Lucas Maiß 2018-7-2

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https://ww2.mathworks.cn/matlabcentral/answers/408350-problem-with-double-derivative

评论： Ameer Hamza 2018-7-3

Hello, I have a simulink model where a signal is integrated twice, then some calculations are done and the output is derivated twice and fed back into the integrator. Now I got an error at the first integrator, that the signal is not finite. With only one derivative block it has no problem, therefore I think the second one produces a very high peak. With a delay block it is also working but I am not sure if that is the right way to do it. So do you have ideas how to solve this problem ? Greetings Lucas

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Ameer Hamza 2018-7-3

@Lucas Maiß's answer moved here

What I do is that I have a clutch and I use the angular position and subtract the portion that is caused by the stiffness of the clutch. Afterwards I use my position to calculate the friction and inertia an subtract it from the input of the first integrator.

Ameer Hamza 2018-7-3

I don't completely understand the issue, because the simulation run fine even if I make the delay equal to 0, but removing delay block brings a singularity in the model. You might want to look at this answer: https://www.mathworks.com/matlabcentral/answers/99084-why-am-i-receiving-error-messages-about-singularities-in-my-simulink-model.

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