DESIGN AND NONLINEAR ANALYSIS OF 2-BODY CENTRIFUGAL PENDULUM VIBRATION ABSORBER FOR SUPPRESSION OF MULTIPLE HARMONIC FREQUENCIES IN TORSIONAL VIBRATION OF ROTOR SYSTEM

The centrifugal pendulum vibration absorber (CPVA) is widely used as an effective vibration suppression device. Most of the CPVAs that have been studied so far are composed of a single mass point or a rigid body (1-body CPVA). They are effective in reducing the vibration of a single-order component. This property makes them highly suitable for using in gasoline-powered vehicles. The development of electric vehicles (EVs) and hybrid electric vehicles ( HEVs) has introduced complex torsional vibrations to the vehicle's rotational shaft. As a result, it has become necessary to suppress vibrations of different order components simultaneously. Therefore, in this study, a rigid body model for a 2-body CPVA is proposed to suppress rotor system vibrations with multiple order components. A multi-body dynamics (MBD) analysis model is constructed to analyze a rotor system equipped with the 2-body CPVA. Furthermore, tuning equations for the 2-body CPVA to suppress multiple order components are derived, and the shape of the 2-body CPVA is investigated to further enhance its effectiveness. The designed 2body CPVAs are installed on the rotor system, and numerical analysis is performed using the direct integration method and shooting method. Subsequently, it is confirmed that the 2-body CPVA is effective in reducing torsional vibrations with two-order components. Furthermore, it demonstrated the superiority of one 2-body CPVA in suppressing vibrations of multiple order components compared to two different 1-body CPVAs.