HOW TO AVERAGE TRANSFER FUNCTIONS

Hi, I am exciting a structure with white noise to get its transfer function. The function I am using is tfestimate. Suppose I use a longer excitation signal: I was wondering if I can split it, calculate more transfer functions and then average them: how can I do this in MatLab? It is possible using tfestimate? Another thing what I was wondering is does the overlap influence the goodness of the transfer function? If so, how? Thanks in advance, Best regards

Answer 1

[Kanthaswamy Ganapathy]

Think of an approach where you could add all the transfer functions together resulting in a higher order model. Then perform the model order reduction using 'balred' for the order of choice as similar to the individual transfer functions. Final step plot & frequency plot should show the average transfer function lying between the boundary of all the other transfer functions.