Vibration Analysis: FFT, PSD, and Spectrogram Basics [Free ...
Jun 16, 2016· If vibration analysis is being done on a changing environment, a spectrogram can be a powerful tool to illustrate exactly how that spectrum of the vibration changes. PSD A power spectral density (PSD) takes the amplitude of the FFT, multiplies it by its complex conjugate and normalizes it to the frequency bin width.