Issues with Block by Block analytic Linearization algorithm

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Alexandre 2015-7-30

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https://ww2.mathworks.cn/matlabcentral/answers/231812-issues-with-block-by-block-analytic-linearization-algorithm

Hello,

I'm having a unexpected issue trying to linearize my Tandem Helicopter non-linear simulink model. I'm using the L.A.T (Linear Analysis Tool), but I have the same issue with linmod. The trimming processed is done using the L.A.T.

Here is the issue, the algorithm apparently modifies one of the model's sub-systems parameter input (a normally static 1 or 0) which triggers a error. I also tried specifying the linear analysis points explicitly.

I tried using the numerical perturbation algorithm but the resulting state-space is incorrect.

I would greatly appreciate any help.

Thanks