Design and simulation of shear-tension spring-type quasi-zero stiffness isolator

Abstract

By connecting the linear compression spring (positive stiffness mechanism) in parallel with the tension spring (negative stiffness mechanism) and using the shear lever mechanism to amplify the motion of the negative stiffness mechanism, a shear-tension spring type quasi-zero stiffness isolation system is constructed, which is suitable for low-frequency and ultra-low-frequency vibration isolation, especially for small-amplitude, low-frequency vibration isolation. In addition, the vibration isolation system has adjustable function. When the mass of the isolated object changes, it is needed to adjust the linear bearing at the bottom of the vertical spring to change the length of the spring, so as to keep the isolation system in the equilibrium position of the quasi-zero state. The results show that the isolator has excellent performance in isolation of low frequency vibration with small and micro amplitude.

A Variable Parameter Ambient Vibration Control Method Based on Quasi-Zero Stiffness in Robotic Drilling Systems

“…Cheng et al found that the changes in load and excitation amplitude had impacts on vibration control performance [19]. A quasi-zero stiffness vibration isolator based on a shear lever mechanism was presented in [20], which cannot only guarantee the function of quasi-zero stiffness, but also has an adjustable capacity to adapt to a variation of load. A cam-roller vibration control system based on a quasi-zero stiffness mechanism was proposed in [21].…”