准零刚度扭转隔振器振动传递特性研究

A torsional isolator with negative stiffness structures is proposed and the quasi-zero stiffness characteristic is got by analyzing the design parameters of this isolation system. The two-degree freedoms dynamic model is built and the harmonic balance method is employed to solve for the dynamic response of the system. Considering the influence of amplitude, damping, and rotational inertia of the isolation system, the torque transmission and vibration power flow characteristics are investigated to examine the performance of this nonlinear isolator. The results show that this torsional isolator has good low-frequency isolation performance and hardening stiffness nonlinearity. From the analysis of the power flow behavior, the results show that there has a good correlation between input power flow, dissipated power flow and instantaneous transmitted power flow. Rotational inertia has great influence to the vibration performance of system in the low frequency away from the peak frequency regions. Finally, the vibration isolation characteristics of the torsional vibration isolator are tested. The experiment results show that the isolator has good isolation characteristics of low frequency vibration.