Eigenvalue Analysis of the torsional vibration of rotors system with CPVA

Abstract

Torsional vibration of engine occurs because the driving torque of engine changes periodically. Recently, noise caused from this torsional vibration is getting serious problem. A centrifugal pendulum vibration absorber (CPVA) is one of the vibration suppression devices for this kind of torsional vibration of engines. In this study, vibration suppression mechanism of CPVA was investigated for 1DOF rotor system. First, a numerical simulation for the nonlinear model of CPVA was demonstrated, and its vibration suppression effect was confirmed, numerically. Then, the natural frequency analysis was demonstrated and the vibration suppression mechanism of CPVA was explained by it. Furthermore, super-harmonic resonances caused by the influence of CPVA’s nonlinearity were also explained.