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The Power Spectral Density (PSD) is the distribution of signal power over frequencies.

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Can I see from the PSD if a system is a LTI system?

Yes, the PSD of a time signal can give you infos about the linearity of the system under study. For example, assume you are studying a symmetric duffing's oscillator described by the equation: $m \d …
Rhei's user avatar
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What assumptions should be used to invert spectrum into time domain data?

This is not a proper answer, but I am not yet allowed to leave comments. If you need to convert your PSD into time history I think you could find useful to visit this website http://www.vibrationdata …
Rhei's user avatar
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