Abstract
There are several significant modal testing challenges to overcome when striving for the goal of an “adequate linear estimate” of the structural dynamics model. Shaker excitation often has an advantage over impact excitation in meeting this goal. In many cases, shaker testing can reduce the effects of nonlinear response, provide better signal to noise ratio, eliminate overload problems associated with out-of-band force input, provide more consistent data, and provide faster testing by utilizing MIMO acquisition. There are tradeoffs between FRF linearization, FRF distortion, signal to noise ratio, and testing time depending on the shaker forcing function. Some of the major tradeoffs have been addressed for random, pseudorandom, periodic random, burst random, chirp, and stepped sine testing. Shaker mounting and fixturing requires special considerations to mitigate undesirable frequency and damping effects of the shaker and its hardware upon the test article and to minimize side loads and moments on the force gage. Certain steps can be taken to ensure the shaker fixturing is adequate, and many diagnostics are available to ensure the goal of obtaining an “adequate linear estimate” of the structural dynamics model.
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