外部モニタによる歯車装置の内部の振動挙動の把握 : 第2報, 伝達関数の推定法について

The previous report had shown that the vibration of gears can be estimated from the vibration of a pedestal with the transfer function. In this paper, the coherence function between the vibration of gears and a pedestal, which is obtained under operation, is examined. As a result, it is found that the frequency with high coherence, where the transfer function could be determined clearly, changes according with the rotating speed. Thus the pseudo-transfer function is defined as a collection of each transfer function having highest coherence at each frequency. Furthermore, various transfer functions by impact excitation in static state are compared with the proposed pseudo-transfer function for the possible way to obtain realistic transfer function, and optimal excitation method is discussed.