Applications of Power Spectral Density [closed]

1. What are the applications of PSD?
2. Why is power spectral density used?
3. Why the power spectral density PSD is the gold standard of vibration analysis?
4. What is the difference between power spectrum and power spectral density?

What are the applications of PSD?

A PSD is typically used to characterize broadband random signals. The amplitude of the PSD is normalized by the spectral resolution employed to digitize the signal. For vibration data, a PSD has amplitude units of g2/Hz.

Why is power spectral density used?

1.2 Power spectral density features. PSD of a signal gives an analysis of the distribution of power over the entire frequency range. The main objective of using this method is to obtain the spectral density estimation from the given data.

Why the power spectral density PSD is the gold standard of vibration analysis?

The reason is that PSDs are normalized to the frequency bin width preventing the duration of the data set (and corresponding frequency step) from changing the amplitude of the result.

What is the difference between power spectrum and power spectral density?

These two terms are used interchangeably throughout the signal processing and mathematics communities; at a conceptual level, there is no difference between these two terms. The two terms both describe how the intensity of a time-varying signal is distributed in the frequency domain.