Abstract
A new, convenient and accurate method is introduced for curve fitting of a frequency spectrum of a transfer function with light damping. Using this method, both the building block approach and the extracting block approach are tried to analyze the vibration of a simple model structure. Transfer functions necessary for these two approaches are obtained in the following two ways, namely in experiment by the harmonic exciting test and in numerical calculation by the reduced impedance method the authors proposed before. The above two approaches are performed under the following three combinations of transfer functions, namely, experiment : experiment, experiment : calculation and calculation : calculation. The analytical resuits agree well with the experimental ones in all cases. Combination of the above two approaches and the reduced impedance method makes it possible to foresee the vibration of mechanical structures only by calculation in design stage.
