Experimental identification of modal momentum coefficients and modalidentity parameters

The identification from laboratory test data of modal momentum coefficients, modal identity parameters, and conventional modal parameters (frequencies, damping factors, mode shapes, and modal normalization constants) is successfully demonstrated using recently developed theoretical procedures that are based on driven-base and portable exciter modal tests. The tests and demonstration employ a cantilever beam with unidirectional driven-base excitation. The use of experiment-de rived modal parameters with modal identities to obtain a measurement-based assessment of relative modal momenta and completeness of the modal determination also is demonstrated. The results of three independent sets of data are compared with each other and with corresponding theoretical results for an undamped uniform cantilever beam.