Two-Stage Origami-Based Vibration Isolators with High-Static-Low-Dynamic-Stiffness Characteristics

This paper focuses on the structure, dynamics, and isolation performance of the proposed two-stage high-static-low-dynamic-stiffness (HSLDS) vibration isolator consisting of two Tachi-Miura origami units in series. Torsion springs are placed at creases to introduce elastic effect into the origami-based vibration isolator. Employing the nonlinear stiffness properties of Tachi-Miura origami, the HSLDS characteristics of the isolator unit are achieved by adjusting the stiffness coefficient of the spring at the creases. Moreover, an equivalent dynamic model of the coupled origami-based isolator is established; the analytical steady-state behavior is obtained. The force trans-missibility results and comparative analysis demonstrate the effectiveness of the presented two-stage origami-based isolator in low-frequency vibration isolation.