Dynamic performance analysis of a mixed‐connected inerter‐based quasi‐zero stiffness vibration isolator

Abstract

Summary An inerter‐based quasi‐zero stiffness (IQZS) vibration isolator is proposed to further enhance the dynamic performance of the QZS one. It combines the superior nonlinear stiffness characteristic of the QZS vibration isolator and the beneficial mass magnification effect of the inerter. The diamond‐shaped structure is used as the negative stiffness structure; an additional spring is added together with the inerter and damper to construct a novel IQZS vibration isolator, which the inerter and damper are first parallel connected and then series connected with the additional spring; it is a mixed‐connected (MC) type and termed as MC‐IQZS vibration isolator. The dynamic response of MC‐IQZS vibration isolator is acquired via harmonic balance method (HBM), and the isolation performance is evaluated using four performance criteria. The effects of the inerter and additional spring on its dynamic response and isolation performance are examined. The results show that the MC‐IQZS vibration isolator could have smaller displacement amplitude and force transmissibility peaks, wider isolation frequency band, and faster high‐frequency force transmissibility attenuation rate than the QZS one, and it can improve the four performance criteria simultaneously. Its isolation performance is further compared with another two typical types of IQZS vibration isolators where the inerter and damper are in parallel‐connected (PC) and series‐connected (SC), respectively, and they are denoted as PC‐IQZS and SC‐IQZS vibration isolators, respectively. The results demonstrate that the proposed MC‐IQZS vibration isolator could achieve the best isolation performance among the three IQZS ones, which offers an effective option for excellent vibration suppression in practical engineering.

Parameter optimization of vibration control system for adjacent building structures based on negative stiffness inerter damper

“…A tuned inerter damper has a larger control force in a narrower frequency range, and can effectively reduce the peak response of the system 11 . The combination of inerter and QZS system gives full play to the advantages of both devices, while mixed-connected type vibration isolators show the best vibration isolation performance 12 , 13 . The introduction of tuned mass negative stiffness inerter damper in base-isolated structures can significantly reduce the seismic response 14 .…”

Modeling and characteristics study of double-diamond bionic vibration isolation system with inerter

“…Double-diamond bionic kangaroo leg structure. (Zhang et al, 2019a(Zhang et al, , 2019bChen et al, 2020;Wang et al, 2021;Cao et al, 2022;Liu et al, 2022), which provides a good idea for the research of this paper.…”

“…To suppress the sway vibration of the aircraft landing gear, Li Y et al added the inerter to the sway vibration suppression device and achieved good results (Li et al, 2017). Moreover, some investigators combined inerter with the NES or the X-shaped structure to reduce the overall mass of system and achieve better vibration reduction/isolation effect (Zhang et al, 2019a, 2019b; Chen et al, 2020; Wang et al, 2021; Cao et al, 2022; Liu et al, 2022), which provides a good idea for the research of this paper.…”

Design and Analysis of a Novel Quasi-Zero Stiffness Isolator under Variable Loads

“…Subsequently, the cam-rollerspring mechanism [13][14][15] was further studied. Recently, Wang et al [16,17] combined the diamond-shaped negative stiffness structure and inertial dampers to design a new type of inertial-based QZS isolator, which has good nonlinear stiffness characteristics and mass amplification effects and can achieve superior vibration isolation performance. In the past decade, magnets have gradually become the focus of research topics due to their noncontact and nonfriction characteristics [18][19][20][21].…”