Tunable negative stiffness spring using maxwell normal stress

A vibration isolator based on a tunable negative stiffness mechanism combines the advantages of high-staticlow-dynamic stiffness (HSLDS) isolators to expand the isolation frequency band and variable stiffness isolators to suppress resonance. In this paper, a novel tunable negative stiffness spring using Maxwell normal stress (SMNS) is proposed. The stiffness tunable range and energy utilization efficiency are greatly improved due to the newly designed magnetic circuit. Moreover, the electromagnetic negative stiffness device has the advantages of no friction, no backlash, compact structure and easy control. An analytical model of the electromagnetic force is built based on magnetic circuit analysis, and the parameter analysis is performed. An HSLDS isolator is constructed by connecting the SMNS in parallel with a linear isolator. The stiffness and vibration isolation performance are measured. The experimental results show that the SMNS produces an online tunable negative stiffness, which expands the isolation bandwidth and significantly improves the vibration isolation performance.

Automated summary

This paper proposes a vibration isolator based on a tunable negative stiffness mechanism, which combines the advantages of high-static low-dynamic stiffness isolators and variable stiffness isolators. The use of a novel tunable negative stiffness spring using Maxwell normal stress results in significantly improved stiffness tunable range and energy utilization efficiency due to the newly designed magnetic circuit. Experimental results demonstrate that the device can produce online tunable negative stiffness, expanding the isolation bandwidth and significantly improving vibration isolation performance.