Patent ID: 7299698

Claim:
A vibration test module that is operational in a vibrating system to produce vibrations at a predetermined set of frequencies, said vibration test module comprises: enclosure means, directly connected to said vibrating system at a predetermined location, for vibrating in response to vibration of said vibrating system, comprising: a housing of predetermined geometric share, a plurality of walls, located within said housing and arranged in a predetermined orientation with respect to each other; wall flexibility means; and mass means enclosed in a volume created by said pluralitv of walls, for impacting said walls when said vibrating system imparts vibrations to said vibration test module wherein said wall flexibility means shape a vibration spectrum of said impact and wherein said wall flexibility means comprises: means for adjusting a spectral response of said vibration test module, comprising at least one of: a spring means interconnecting at least one of said walls with said housing, or a wall position adjustment means for adjusting a spacing among said walls.