Study on the Performance of a Quasi-Zero-Stiffness Isolator with Time Delay Control

含有时滞控制的准零刚度隔振器的隔振性能研究

Received: 15 September 2017

Abstract

A quasi-zero-stiffness vibration isolation consists of a pair of oblique springs and a vertical spring, aiming at widening the vibration isolation region, is studied in this paper. The time delay linear displacement feedback control strategy is introduced to improve the performance of the isolator. The characteristics of dynamical response under harmonically forcing excitation is obtained by using averaging method. The force transmissibility of the control isolator is presented in this paper. The influence of the time delay linear displacement control on the force transmissibility is studied theoretically. The results show that the performance of the vibration isolation with time-delay control is better than the equivalent linear isolator in either low or high frequency region and the performance of controlled system is better than uncontrolled system.

摘要

采用一对斜置弹簧作为负刚度元件，与垂直弹簧并联组成准零刚度非线性隔振器，从而增大系统的隔振频率范围。并引入线性位移时滞控制。通过平均法分析得到系统在简谐力激励下的响应特性。在此基础上，研究了该刚度系统在引入线性位移时滞控制时的力传递特性，给出了时滞控制对力传递率的影响规律和特点。结果表明，无论受控系统是在低频段还是高频段，该隔振器的隔振性能均比等效的线性隔振器要好，而受控系统的隔振性能优于不受控系统。