Analysis and design of a novel and compact X-structured vibration isolation mount (X-Mount) with wider quasi-zero-stiffn
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ORIGINAL PAPER
Analysis and design of a novel and compact X-structured vibration isolation mount (X-Mount) with wider quasi-zerostiffness range Jing Bian . Xingjian Jing
Received: 22 February 2020 / Accepted: 3 August 2020 Ó Springer Nature B.V. 2020
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 J. Bian X. Jing (&) Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China e-mail: [email protected]
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. Keywords Vibration isolation Nonlinear stiffness Nonlinear damping X-shaped structure X-mount
1 Introduction Vibration generated by machines or other environmental factors is often troublesome and inevitable. However, vibration can be suppressed by a properly designed isolator or isolation platform. An isolation system attempts either to protect a delicate object from excessive vibration transmitted from its supporting structures or to prevent vibratory forces generated by machines from being transmitted to surroundings. Some recent advances of vibration isolation systems can be referred to [1, 2]. The equivalent stiffness and damping properties of a vibration isolation system are two key factors to determine the vibration transmissibility and thus the performance of the isolation system. Some interesting vibration isolation systems were developed recently in [3–7], in which the nonlinear stiffness and damping properties were
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