Simulation and Experiment of a Novel Vibration Reduction Unit Based on Piezoelectric Shunt Damping

In this paper, a novel micro-displacement piezoelectric vibration reduction unit is proposed; Meanwhile, the vibration control of the single degree of freedom system is performed by it. This vibration reduction unit is a component of a damping ring, which is uniformly installed inside the ring along the circumferential direction. The damping ring is installed between the bearing and the support seat, which can be used for vibration control of rotating machinery. This vibration reduction unit uses a piezoelectric stacked external RC resonant circuit as the basic component, and uses the piezoelectric shunt damping principle to achieve damping. The piezoelectric stack is surrounded by a metal structure. When excited by a radial force, the metal structure finally squeezes the piezoelectric stack along the polar axis, generates electrical energy and dissipates it through a damping circuit. Due to its unique structure, this unit has higher stiffness than traditional damping materials. In order to analyze and demonstrate the performance of the damping unit, the electromechanical coupling finite element model is established, and the stiffness of the damping unit is simulated. Then the parameter values of the damping circuit are determined, and the force transmission rate between the two ends of the damping unit is calculated. Finally, the simulation results and the performance of the damping unit are verified on the test bench. The experimental results show that the force transmissibility of the system is effectively reduced at the resonant frequency.