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Shock and Vibration
Volume 3, Issue 6, Pages 393-401

Frequency and Spatial Shaping of Inputs for Multiaxis Shaker Testing

Craig C. Smith1 and Forrest L. Staffanson2

1Department of Mechanical Engineering, Brigham Young University, Provo, UT 84602-4102, USA
2Ogden Engineering Laboratory, TRW Strategic Systems Division, Ogden, UT 84403-2400, USA

Received 26 September 1995; Accepted 15 April 1996

Copyright © 1996 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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 alone. Spatial shaping is described in terms of a basic mathematical model relating test article response (absolute and relative motions) to excitation by the shaker. Advantages and objectives are viewed through spectral relationships. The objective of simulating dynamic responses as in service is shown to be the duplication of the resultant cross-modal response for all important modes, even if the sources of excitation in service are unknown.