FREQUENCY AND SPATIAL SHAPING OF INPUTS FOR MULTIAXIS SHAKER TESTING

Controlled amplitude and phase relationships between multiaxial shaker inputs (i.e., spatial shaping) provides for more realistic simulation of a service environment than does conventional frequency shaping alo ne. Spatial shaping is described in terms of a basic mathematical mode l relating test article response (absolute and relative motions) to ex citation by the shaker. Advantages and objectives are viewed through s pectral relationships. The objective of simulating dynamic responses a s in service is shown to be the duplication of the resultant cross-mod al response for all important modes, even if the sources of excitation in service are unknown. (C) 1996 John Wiley & Sons, Inc.