Using (and interpolating) characteristic from Matlab in Simulink

Hi

I am currently creating model in Simulink for simulating dynamical behaviour of multibody system for my assignment.

For spring elements I would like to apply my own characteristic F(x) (where F is Force and x elongation) defined in m-file instead of proportional characteristic with k (or c) coefficient.

I was trying to use a User defined Matlab function block but I could not find out how to get characteristic from "compiled" M-file.

I do not know whether it would be the best solution, maybe I am missing something.

Whole idea is to get a force based on given elongation which is defined by my own characteristic with ability to interpolate between points, for example characteristic is defined for every 1cm but when x is given with greater precision it should linearly interpolate between points.

Waiting for any suggestions.

Thank You in advance

[Krzysztof BiaduD]

I would really appreciate any information regarding reading characteristic from Matlab to Simulink.

Thanks

Answer 1

[K E]

If you want to interpolate between (x, F) points and F only depends on x, use a Lookup table and supply pre-calculated x and F vectors. Simulink will interpolate between the values.