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Analysis and design of a novel and compact X-structured vibration isolation mount (X-Mount) with wider quasi-zero-stiffness range

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Abstract

Passive vibration isolation is always preferable in most engineering practices. To this aim, a novel, compact and passive vibration isolation mount is studied in this paper, which is designed by using the X-shaped structure with a much smaller size. The novel mount is adjustable to different payloads due to a special oblique and tunable spring mechanism, and of high vibration isolation performance with a wider quasi-zero-stiffness range due to the deliberate employment of negative stiffness of the X-shaped structure. The X-shaped structure has been well studied recently due to its excellent nonlinear stiffness and damping properties. In this study, it is for the first time to explore the utilization of the negative stiffness property within the X-shaped structure such that the resulting design, the X-structured mount (X-mount), can have an obviously larger vibration displacement range which maintains the quasi-zero-stiffness property. A special oblique spring is thus introduced such that the overall equivalent stiffness of the X-mount can be much easily adjusted according to different payloads. Systematic parametric study is conducted to reveal the critical design parameters and their relationship with vibration isolation performance. A prototype and experimental validations are implemented to validate the theoretical results. It is believed that the X-mount would provide an innovative technical upgrade to many existing vibration isolation mounts in various engineering practices and it could also be the first prototyped mount which can offer adjustable quasi-zero stiffness and adjustable loading capacity conveniently.

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Funding

The work is supported by a general research fund (GRF) of HK RGC (Ref. 15206717) and an innovation and technology fund (ITF) project of HK ITC (ITP/020/19AP)

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  1. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China

    Jing Bian & Xingjian Jing

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  1. Jing Bian
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Jing Bian did the simulation and analysis work under supervision of Dr. Xingjian Jing who also provided the research idea, organized the research work and rewrote the paper based on the draft from Jing Bian.

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Correspondence to Xingjian Jing.

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Bian, J., Jing, X. Analysis and design of a novel and compact X-structured vibration isolation mount (X-Mount) with wider quasi-zero-stiffness range. Nonlinear Dyn 101, 2195–2222 (2020). https://doi.org/10.1007/s11071-020-05878-y

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