Simscape Integration leads to an error

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muhammed said parlak 2021-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/1451729-simscape-integration-leads-to-an-error

回答： Dallas Perkins 2023-10-13

Hello guys,

I have modelled a mechanical system on SimScape to run an analyze in time domain and obtain the frequency response of it. I'd like to represent ground acceleration and since there is only ideal source for velocity I integrate the acceleration series. But unfortunately it results in wrong velocity series which starts from "0". When I change the initial condition, velocity series result in correct form but this time displacements of the mass get wrong. How can solve this problem?

g=0.5:0.001:1.5;
mdmax=nan(size(g));ddmax=nan(size(g));
for i=1:size(g,2)
    freq    =g (i);
    amp     = 1/-freq; b%initial condition parameter for the velocity time series.
    data    = sim('tmdmodel.slx');
    data1   = flip(data.massdisp.Data);
    data2   = flip(data.dampdisp.Data);
    data3   = flip(data.gdisp.Data);
    mdmax(i)= max(abs(data1(2:round(end/2))));
    ddmax(i)= max(abs(data2(2:round(end/2))));
end

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Answer 1

Dallas Perkins 2023-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/1451729-simscape-integration-leads-to-an-error#answer_1332719

Hi Muhammed,

Correct, if you are integrating an acceleration input to get velocity you can set the "initial condition" parameter on the integrator block to control initial velocity.

Can you clarify how the resulting displacement is wrong? Generally this will be a function of the mass/spring/damper coefficients so you might need to vary those to get your expected displacement result.