Patent ID: 11921013
Assignee: UNIVERSITY OF MARYLAND, BALTIMORE
Field: Measurement (Instruments)
Classification: CPC G  F  Y | IPC F  G

Claim 0:
1. A method comprising:
measuring a response of a rotating structure subject to random excitation with a tracking continuous scanning laser Doppler vibrometer system;
determining a Fast Fourier Transform (FFT) of the response;
applying a bandpass filter to the response with a passband that includes a damped natural frequency of the rotating structure to create a filtered response;
determining a time interval between a minimum value and a maximum value of the filtered response;
multiplying the filtered response in the time interval by sinusoidal signals to create a plurality of processed responses; and
applying a lowpass filter to the plurality of processed responses to obtain an end-to-end undamped mode shape of the rotating structure.