Abstract
Experimental modal analysis is widely used as a basic technology obtaining dynamic characteristic for mechanical systems design. In experimental modal analysis, input and output signals are measured. However, it is difficult to measure exiting force of mechanical structures because of a given boundary condition. Moreover, Operational Modal Analysis has been used on a field test, and the test structure is excited by the ambient force. When the input signals are unknown, the scaled mode shapes cannot be obtained. In this study, an estimation procedure for the scaling factors of normalized modal shapes is proposed. Furthermore, the real natural frequencies which excluded the effect of additional mass are identified by the mass change method.
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