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  5. Calculating damage and service life from Power Spectral Density (PSD)

Article | REF: BM5032 V1

Life-span of mechanical systems - Study of the impact of random solicitation

Authors: Raed KOUTA, Daniel PLAY

Publication date: April 10, 2008

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4. Calculating damage and service life from Power Spectral Density (PSD)

A mechanical system or component has a response to applied loads (DSP). This response can either be measured on a prototype subjected to qualification tests, or calculated from a global mechanical model.

The expression shows that the damage depends on the variance of the stress amplitudes. Relation (39) in § 3.1

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