Design and analysis of semi-active quasi-zero stiffness vibration isolator based on magnetorheological damper and halbach array magnetic spring

作者：Xudong Xing, Zhaobo Chen, Yuechen Liu, Jiaxi Jin · 发表于：Mechanics of Advanced Materials and Structures · 年份：2025 · DOI：10.1080/15376494.2025.2471957 · 被引用次数：6 · 研究领域：Vibration Control and Rheological Fluids、Geophysics and Sensor Technology、Structural Engineering and Vibration Analysis

Traditional linear vibration isolation systems often fail to simultaneously provide high load-bearing capacity and effective low-frequency isolation. To overcome these limitations, this paper introduces a semi-active quasi-zero stiffness (QZS) vibration isolator featuring adjustable damping. The proposed system integrates a magnetorheological (MR) damper, a Halbach permanent magnet array, and coil springs. Damping is modulated by varying the applied current, while the Halbach array enhances the magnetic force without increasing system size. A magnetic force model is developed for both axially and radially magnetized permanent magnets and validated experimentally. Parametric studies examine the influence of magnet thickness, width, and air gap on the magnetic force. Furthermore, a nonlinear dynamic analysis employing the harmonic balance method investigates how excitation amplitude, damping, and nonlinear stiffness affect isolation performance. The fourth-order Runge-Kutta method simulates the responses of both the QZS and linear isolators under various excitation frequencies. Results indicate that the QZS system reduces the root mean square displacement by 63.3%, 92.8%, and 62.5% in the low-frequency, resonance, and high-frequency regions, respectively. Experimental tests verify that the QZS isolator broadens the isolation frequency range while maintaining load-bearing capacity. Therefore, the proposed design offers an exceptionally compact, high-performance solution for prac...