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  • The Fatigue Damage Spectrum of a vibration is obtained by tracing the fatigue damage experienced by a linear Single Degree of Freedom System according to its natural frequency, for given damping ratio and for a given value of parameter b. Regardless of the vibratory signal studied; the FDS can be obtained directly from the time history signal. The method consists of : numerically calculating relative response displacement of the mass in relation to its support; establishing a peak histogram, giving the number ni of peaks according to their amplitude; using Miner’s damage accumulation law. In the case of stationary random vibration, the Power spectral density of the vibration can be directly used for the FDS calculation. Wikipedia