2022 Volume 2022 Issue 67 Pages 35-42
This study aims to design vibration isolators, using two types of coil springs with different hysteresis, and evaluate the vibration isolation performance of each design. Vibration isolation is achieved through nonlinear spring characteristics of the isolators using an origami-inspired foldable structure attached to the coil spring, which have quasi-zero spring stiffness. However, the two vibration isolators exhibited different load-displacement curves between expansion and contraction processes. Due to the hysteresis of the spring characteristics of the vibration isolators, the quasi-zero stiffness was not exactly obtained. As a result of the excitation experiment, it was found that the vibration isolator with small load difference had low resonance frequency. This fact indicates that the magnitude of load difference affects the vibration isolation performance, and it is important to select a coil spring with small load difference in order to improve the performance.
