Analytical Study on a Quasi-Zero-Stiffness Vibration Isolator Based on Magnetic Rings and Disc Springs

Abstract

A suitable quasi-zero-stiffness (QZS) vibration isolator system was developed for confined installation spaces. The system achieves close-to-zero stiffness through the parallel combination of magnetic rings and disc springs. First, the Halbach magnetization method was proposed for the positive stiffness mechanism owing to its advantages in the field of non-contact transmission. Furthermore, the negative stiffness mechanism was designed based on the nonlinear stiffness characteristics of disc springs. Next, the proposed QZS vibrator isolator was structurally optimized by focusing on the interaction between the positive and negative stiffness mechanisms. Thereafter, the effects of key structural and operating parameters on its dynamic characteristics (e.g., resonance frequency and force transmissibility (T_e)) were analyzed to validate the accuracy of the theoretical model. Finally, comparative experiments were conducted using a magnetic bearing testing platform to evaluate T_e through the QZS vibration isolator and its equivalent linear isolator under identical excitation. The results demonstrated that the QZS vibration isolator exhibited superior low-frequency vibration isolation performance. This study offered a basis for prototype manufacturing, future experimental validations, and broadening engineering implementation.

Keywords

Halbach / Quasi-zero-stiffness vibration isolator / Nonlinear dynamics / Low-frequency vibration control / Adjustable operating condition

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Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature

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