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parameter estimation with recursive least square estimator in simulink

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Anil Shrestha
Anil Shrestha 2019-5-21
I have this equation of a quarter car model mx''+dx'+cx=0.I am comparing this Quarter car model with real car data. As a comparision between model and real car i took the x'' (acceleration) of my car body.I used RLS estimator in simulink to estimate the parameter d (damping coefficient) so that the acceleration of my car model is equal to the real car. I need the parameter to be in positve axis only but i get parameter changes in positve and negative axis. Im not sure i used the correct equation for the Regressor.

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