The latest generation of FFT Analyzers contain still more and better features for excitation, measurement and recording of frequency response functions (FRF's) from mechanical structures. As measurement quality continues to improve, a larger variety of curve fitting methods are being developed to handle a set of FRF measurements in a global fashion. These approaches can potentially yield more consistent modal parameter values than curve fitting individual measurements independently. In this paper, a new formulation of the Rational Fraction Polynomial method is given which can globally curve fit a set of FRF measurements. The pros and cons of this approach are discussed, and an example is included to compare the results of this method with a local curve fitting method.
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