Design and characteristics of a novel QZS vibration isolation system with origami-inspired corrector

Abstract

A new class of quasi-zero-stiffness (QZS) vibration isolation systems, inspired by the origami metamaterial, is proposed to achieve high-performance vibration suppression in this paper. According to the mechanical characteristics of Tachi-Miura origami (TMO) with single degree-of-freedom, the nonlinear geometric relationship is developed with the folding angle as the master variable. By utilizing equivalent transformation and virtual work principle, the static model is established, the in uence of structural parameters on stiffness is investigated, and the negative stiffness mechanism of origami mechanism is revealed. By adding a linear spring with positive stiffness to the origami in parallel, the Tachi-Miura origami vibration isolator (TMOriVi) is obtained. Subsequently, the governing equation is presented by means of the harmonic balance method. Two types of instability situations, jump phenomenon and unbounded response, are studied, and their analytic criteria and relationship are derived. Finally, through the parametric in uence analysis and a series of comparative studies, the effectiveness and superiority of the proposed isolator are veri ed. The proposed vibration isolation system with great design exibility exhibits a signi cant potential in the eld of low-frequency vibration isolation.

Design and Development of Structural Parameter Identification Software for Nonlinear Vibration Isolators

“…A QZS system generally consists of parallelly connected positive and negative elastic structures, where the positive elastic part bears the static preload, such as weight. Typical designs can be seen in figure 1, including (a) three spring structure, (b) Euler pressure bar structure, (c) roller cam structure, (d) spring connecting rod structure, (e) magnetic structure, and (f) air spring structure [10]. Although the structures displayed in figure 1 are different, their motion can be generally described as…”

Modeling, analysis, and simulation of X-shape quasi-zero-stiffness-roller vibration isolators

“…Yan et al [89] developed the QZS isolator for bistable region, and provided the guidelines for the design, analysis, and optimization. The origami is also a distinct mechanism for the QZS isolator [90][91][92] . Now, QZS isolators have been successfully used in floating rafts of engines [93] , one-dimensional structures [94][95][96] , and bridges [97] .…”

A negative stiffness inertial nonlinear energy sink

“…Vibration is a physical phenomenon that is common in daily life and industrial production. It has some beneficial uses, but most vibrations are harmful [1][2][3][4][5]. For example, the resonance of the 1940 Tecumseh Bridge caused by high winds led to the breakage of the bridge [6].…”