Theoretical analysis of vibration pickups with quasi-zero-stiffness characteristic

Abstract

The use of quasi-zero-stiffness isolators in vibration pickups is investigated in this study. For this purpose, a quasi-zero-stiffness mechanism is first investigated to extract optimal values of parameters guaranteeing these conditions. The frequency response of this type of pickups is then obtained and compared with their equivalent linear pickup to investigate the effects of damping and oscillation amplitude measured by the pickup on the pickup performance. To study the phase distortion, the phase difference between the oscillations exerted on the pickup and those measured by the pickup for various excitation frequencies are measured at quasi-zero-stiffness and their equivalent linear pickups. In this way, the effects of the pickup design parameters on the pickup performance are investigated, and the response of this type of pickups to a sum of two harmonic excitations is studied. Finally, the effects of uncertainties such as friction, noise, etc., on experimental results are investigated.