Spectral acceleration density ( english Acceleration Spectral Density (ASD), and Power Spectral Density (PSD)) is a term used in vibration - Measurement .
The spectral acceleration density is the root mean square value (over the frequency range ) of an acceleration signal that has passed a narrow- band filter of a certain frequency range, divided by the bandwidth of the filter. This normalizes the signal. The spectral acceleration density is the value for the borderline case in which the bandwidth approaches zero and the averaging duration approaches infinity.
It is defined somewhat differently in DIN EN 60068-2-64: 2009-04 than in DIN EN ISO 2041. MIL-STD-810H defines the ASD as a function using a Gaussian curve .
Applications are e.g. B. Vibration tests of mechanical systems that are exposed to random shocks .