エンジン部品の非線形振動

摘要

The vibration problems concerning engine parts can be almost explained by using the linear vibration analysis method. The nonlinear vibration system in which spring stiffness changes with the spring elongation causes interesting phenomena such as the resonance suddenly stopping at a certain frequency and the resonance suddenly reappearing at another frequency. This paper describes characteristic phenomena, generation mechanisms and control methods for nonlinear vibrations through discussion of the results of engine testing, rig testing and calculations.%エンジン部品の振動問題は線形振動の解析手法を用いrnてほぼ解明できるが，エンジン部品においても非線形振rn動が稀に発生する．ばね定数が変位とともに変化する非rn線形振動では，ある周波数で突然共振が止み，別の周波rn数で再度共振が発生するといった興味深い現象が起こる．