Feasibility of Using Modal Analysis Techniques for Nonlinear Multidegree of Freedom Systems,
OHIO STATE UNIV COLUMBUS DEPT OF MECHANICAL ENGINEERING
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Experimental modal analysis systems are now widely available and used extensively for system identification, diagnostics and mathematical model development. A typical user treats the system as a black box and generally relies on the commercial software. Moreover, he may not be aware of the underlying assumptions and the limitations associated with modal extraction and synthesis. Thus there is a potential for misusing the technique which could lead to incorrect results and conclusions. This is especially true when the structure is inherently nonlinear or when vibratory amplitudes are no longer small. The focus of this paper is to examine the feasibility of using conventional modal analysis techniques for such cases.