Research on Modal Analysis : 4th Report, Multi Reference Curve Fitting-(Part 1)

概要

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In determination of the model parameters of a mechanical structure, many kinds of curve fit techniques have been developed, using the theory of experimental model analysis. In the present paper, six methods of multi station multi degree of freedom curve fit techniques, by which multiple eigen values of multiple transfer functions are identified, are compared with one another. First, the model parameters of a mass spring system of five degrees of freedom are determined by the above six methods. Thereby, the input data of the transfer functions are disturbed by adding white noise to them. Thus, the toughness of the above six methods against the noise is checked and compared individually. Next, as an example of the application of these six methods to a complex structure, the model parameters of a white body of an actual automobile are determined by these methods, using the transfer functions measured by the vibration test as the input data. The accuracy and the calculating time of these six methods are compared with each other.
一般社団法人日本機械学会の論文