Open AccessQuasi-zero stiffness isolator based on bistable structures with variable cross-section
Author(s) -
Zhongwen Zhang,
Fenglan Shi,
Chuang Yang,
ZhaoDong Xu
Publication year - 2021
Publication title -
journal of low frequency noise, vibration and active control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.419
H-Index - 25
eISSN - 2048-4046
pISSN - 1461-3484
DOI - 10.1177/14613484211038404
Subject(s) - bistability , isolator , stiffness , nonlinear system , structural engineering , variable (mathematics) , materials science , mechanics , physics , mathematics , engineering , mathematical analysis , electronic engineering , optoelectronics , quantum mechanics
Simple and light-weighted quasi-zero stiffness (QZS) isolators can be designed based on nonlinear and negative stiffness generated by the snap-through effect of bistable structures. Traditionally, the snap-through force of the bistable structure is limited which makes the weight which can be isolated based on this mechanism very low. This paper investigates increasing loading capacity of this kind of isolator by using an optimized and varying sectional profile. Numerical models were derived for the bistable structures with variable sectional distributions. Optimized sections’ alignment of the bistable beam was derived based on the numerical model which was consequently validated by experimental results. Influences of the bistable beams with a variable section on nonlinear stiffness characteristics and performance of the isolator were at last investigated with the harmonic balance method.