Frequency Response Analysis can be used to calculate the response of a system in the frequency domain. This analysis is conducted in the Motion Postprocessor. Before the analysis, the input and output channels must be defined in the Frequency Response and Eigenvalue Analysis must be carried out. This analysis is carried out by using the eigenvalue and eigenvector from the eigenvalue analysis as follows.

(9–17)

where   and   are the input and output in the frequency domain. The output is reported in decibels as follows.

(9–18)