How to understand the relationship between the character of frequency and nonparametric estimation of the system?

Hello:

I am on the show dealing with the identification of the system. The process is as below:

First of all, I use a sine sweep signal (bandwidth is 0 to 50 Hz) to stimulate the actuator;

Second, I use a low-pass filter (the cutoff frequency is 45 Hz) to filter the response signal, like the image below.


Tags: NI Software

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