Linearizing "Recursive Least Squares Estimator" Block

Hi everybody,

I am using the Recursive Least Squares Estimator block in simulink to estimate 3 parameters. Everything works well, and the controller that is using these parameters is doing its job. At least in the non-linear time domain simulation.

However when I linearize the entire system using Linear Analysis Tool, I am getting an unstable system. Could it be that the RLS estimator block is not being properly linearized? I am not getting any errors from the Linear Analysis tool.

Thank you and best regards,

Radu

Answer 1

[Arkadiy Turevskiy]

Why are you linearizing Recursive Least Squares Estimator block? This block outputs parameters and error, and takes output and regressors as inputs. What are you trying to do? What linearization path are you interested in?

[Radu]

Hi Arkadiy,

Thank you for your reply.

I am using the RLSE block to estimate the parameters of oscillations (average value, amplitude). I use this information to create a control loop that damps the oscillations. It is working in the non-linear time domain simulations. I also need to be able to linearize the system around a stable operating point in order to look at the pole/zero map. However, I am not sure if the block is linearized correctly or if I am doing something else wrong. That is why I am asking if this block can in fact be linearized by simulink.

Thank you and best regards, Radu