Natural frequency from time domain and frequency domain plot

[kay10287]

Anyone have an idea to find a first and second natural frequency from time domain and frequency domain plot resulting from an accelerometer measuring the vibration in cantilever beam ?

Thanks very much :)

 

[cepheid]

Welcome to PF kay10287,

What have you done so far on this problem? Can you upload a plot of the frequency spectrum of the accelerometer measurement for us? I imagine that the first few resonant modes should be fairly obvious in a plot of the frequency spectrum.