新型准零刚度振动位移传感系统研究

为解决工程实践中绝对振动位移难以直接测量的问题,提出了一种采用准零刚度技术的新型传感系统。分析了欧拉压杆和传感系统的静力学特性,得到了传感系统具有准零刚度特性的条件;建立了传感系统的动力学模型并对其求解,讨论了传感系统的等效阻尼、欧拉压杆负刚度与弹簧的刚度比和被测信号幅值对测量精度的影响;研究了传感系统在不同激励信号下的动态测量效果。研究结果表明,传感系统可以直接对微幅振动位移进行准确、实时的测量。该新型准零刚度振动位移传感系统可以为全状态反馈振动控制等问题提供一种可行或者更优的测量方案。

Research on a novel quasi-zero-stiffness sensor system for vibration measurement

In order to solve the problem that the absolute vibration displacement is difficult to directly measure in many engineering practices,a novel quasi-zero-stiffness-based sensor system is proposed.Firstly,the static characteristics of the Euler beam and the sensor system are analyzed and the condition of the quasi-zero-stiffness characteristic of the sensor system at equilibrium position is obtained.Secondly,the dynamic model of sensor system is established and solved,and then the effects of equivalent damping,stiffness ratio of compressed Euler beam and spring,the amplitude of measured signal on the measurement accuracy are discussed.Thirdly,the time-domain responses under different excitation signals are studied.The results show that the sensor system can be used to measure the absolute micro-vibration displacement directly,accurately and real-timely.The novel quasi-zero-stiffness sensor system should be a feasible or better measurement scheme for various vibration control with full system states feedback.