Multi-Shaker Random Mode Testing.
Final rept. Jan-Jun 82,
AEROSPACE CORP EL SEGUNDO CA ENGINEERING GROUP
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A mode survey test procedure that combines multi-shaker correlated broad-band random excitation of the test article with the mode isolation features of multiple shaker excitation. The procedure takes advantage of multiple shaker excitation to best isolate the target mode response from all other modes. Mode parameters are then established from direct observation of frequency response functions. The proposed test procedure derives from the recognition that response data of a structure, excited at multiple locations by proportional randomly varying forces, can be analyzed such that the results are equivalent to those obtained had the excitation been harmonic. The test procedure is described in detail and demonstrated by analytical simulation. Author
- Numerical Mathematics