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From: Denis on 25 Mar 2010 12:23

We have an element in our system that can be modeled as a damped low-pass filter with a cutoff frequency of x combined with a unity gain high-pass filter with a cutoff frequency of y where y>x.

I can set this up very easily in Simulink using a pair of 'Transfer Fcn' control blocks and I get a frequency response that matches very well with our system measurements for a given operating condition (i.e. given power).

However, the physical system response is such that as the power changes, so does the cutoff frequencies of the combined high-pass and low-pass responses. Therefore, to complete the model, I would like to somehow get the numerator and denominator expressions in the 'Transfer Fcn' control blocks to change dynamically during the simulation as the power conditions change.

Is there a way to do this?

Apologies if this is a dumb question - I'm still quite new to MATLAB and SimuLink.

Thanks,
Denis
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