The ABRAVIBE example ForcedResponse is illustrating the power of the digital
filter forced response method for computing forced response developed by
Kjell Ahlin and published in, among other references, “Noise and
Vibration Analysis: Signal Analysis and Experimental Procedures,” by
Anders Brandt. The method uses a modal superposition formulation using
a ramp invariant transform to formulate the forced response of each mode.
Also see inside the ABRAVIBE command timefresp for references to original

The example produces time data simulating a measurement of 35
displacement responses on a Plexiglass plate, when it is excited with
four forces in the corners of the plate. Mode shapes and eigenfrequencies
from a finite element model are used as a model for the plate.

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