一种压电型变刚度动力吸振器原理与验证
Principle and Validation of a Novel Variable Stiffness Dynamic Vibration Absorber by using Piezoelectric Stack

为了拓宽传统动力吸振器的的控制带宽，设计了一种采用压电堆元件的变刚度动力吸振器，利用欧拉梁弯曲刚度受其预应力影响的力学原理，采用调节控制电压改变压电堆元件的输出力，进而实时改变作为吸振器弹簧元件的欧拉梁弯曲刚度。介绍了动力吸振器的工作原理，给出了欧拉梁弯曲刚度的计算方法，设计并加工了一种压电型变刚度动力吸振器原理样件，并开展试验验证。动力学特性试验测试结果表明，驱动电压为0~120 V时，吸振器的移频范围为71.5 Hz~75 Hz。
In order to expand the effective frequency band of a conventional dynamic vibration absorber (DVA), a novel variable stiffness DVA with piezoelectric stack is designed. Using Euler beam theory, a piezoelectric stack element is applied to generate preload on the beam which acts as a spring element in the DVA to tune its bending stiffness. The principle of this novel DVA is presented and the equation of the bending stiffness for an Euler beam was deduced. A prototype of this variable stiffness DVA is fabricated. The dynamic behavior of the DVA under different driven voltages is validated experimentally. There results show that the natural frequency of the DVA can be shifted from 75 Hz to 71.5 Hz when the driven voltage was tuned from 0 V to 120 V