A bistable mechanism with linear negative stiffness and large in-plane lateral stiffness: design, modeling and case studies

Zhou, Zhanfeng; Gao, Yongzhuo; Sun, Lining; Dong, Wei; Du, Zhijiang

To overcome the limitations of conventional bistable mechanisms, this paper proposes a novel type of bistable mechanism with linear negative stiffness and large in-plane lateral stiffness. By connecting the novel negative-stiffness mechanism in parallel with a positive-stiffness mechanism, a novel quasi-zero stiffness compliant mechanism is developed, which has good axial guidance capability and in-plane lateral anti-interference capability. Analytical models based on a comprehensive elliptic integral solution of bistable mechanism are established and then the stiffness curves of both conventional and novel bistable mechanisms are analyzed. The quasi-zero stiffness characteristic and High-Static-Low-Dynamic-Stiffness characteristic of the novel compliant mechanism are investigated and its application in constant-force mechanism and vibration isolator is discussed. A prototype with adjustable load-carrying capacity is designed and fabricated for experimental study. In the two experiments, the effectiveness of the proposed quasi-zero stiffness mechanism used in the field of constant-force output and vibration isolation is tested.

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Zhou, Zhanfeng / Gao, Yongzhuo / Sun, Lining / et al: A bistable mechanism with linear negative stiffness and large in-plane lateral stiffness: design, modeling and case studies. 2020. Copernicus Publications.

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