Abstract
In determination of the modal parameters of a mechanical structure, many kinds of curve fit techniques have been developed, using the theory of experimental modal 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 modal parameters of a mass spring system of the five degrees of freedom are determined by the above six methods. At this time, 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 are checked and compared individually. Next, as an example of the application of these six methods to a complex structure, the modal 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.
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