How can fix that error in this simulation?

Question

Merve Ala 2023-4-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1949608-how-can-fix-that-error-in-this-simulation

回答： Walter Roberson 2023-4-19

I am working on this simulation and it gives me this error. What can I do?

An error occurred while running the simulation and the simulation was terminated

Caused by:

Derivative of state '1' in block 'hwmid/Aerodynamic_Data/total forces/Subsystem/Integrator' at time 0.0 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)

Component:Simulink | Category:Block error

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Answer 1

Walter Roberson 2023-4-19

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https://ww2.mathworks.cn/matlabcentral/answers/1949608-how-can-fix-that-error-in-this-simulation#answer_1218663

Derivatives not being finite at time zero are typically mistakes in initialization -- in particular, forgetting that input signals that are updated by a feedback model need to be initialized

But it is also not uncommon to have a model that effectively has a division by t (time) and forgetting that at time 0 that means a division by 0.

https://www.mathworks.com/help/simulink/slref/integrator.html#f7-890704_sep_f7-1513452