On the displacement transferability of variable stiffness multi-directional low frequency vibration isolation joint

In this paper, the proposed variable stiffness vibration isolation joint (VSJ) is refined, and the effects of structural damping and friction are considered and systematically investi-gated. The VSJ is provided with positive stiffness by the disk spring and negative stiff-ness by a combination of opposing buckled Euler beams with adjustable lengths to form a quasi-zero stiffness vibration isolation system. The force balance equations of VSJ in hori-zontal and vertical directions are presented, and the stiffness regulation capability of the structure is discussed. The vibration equations of VSJ are established and the vibration transmission rate under displacement excitation is determined using Taylor expansion and harmonic balance method. Parametric analysis shows that the reasonable configuration of slider position, spring size and stacking form can ensure the low-frequency vibration iso-lation capability of VSJ under heavy load, and has the ability to adjust the stiffness for different working conditions and loads. The excellent load-bearing capacity, small space footprint, and high customizability and flexibility of the performance of the VSJ give it the potential for a wide range of applications in engineering. We have investigated its ad-justable stiffness and vibration isolation performance in the vertical direction by conduct-ing experiments on the prototype to verify the correctness of the theoretical model. (c) 2022 Elsevier Inc. All rights reserved.

Automated summary

This paper presents the design and structure of the proposed variable stiffness vibration isolation joint (VSJ), discussing its potential applications in engineering. Experimental results verify the effectiveness of its adjustable stiffness and vibration isolation performance in the vertical direction.