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Technical Brief

A Six Degrees-of-Freedom Vibration Isolation Platform Supported by a Hexapod of Quasi-Zero-Stiffness Struts

[+] Author and Article Information
Jiaxi Zhou

College of Mechanical and Vehicle Engineering,
Hunan University,
Changsha 410082, China
e-mail: jxizhou@hnu.edu.cn

Kai Wang

College of Mechanical and Vehicle Engineering,
Hunan University,
Changsha 410082, China
e-mail: wangkai@hnu.edu.cn

Daolin Xu

College of Mechanical and Vehicle Engineering;State Key Laboratory of Advanced Design and
Manufacturing for Vehicle Body,
Changsha 410082, China
e-mail: dlxu@hnu.edu.cn

Huajiang Ouyang

School of Engineering,
University of Liverpool,
Liverpool L69 3GH, UK
e-mail: h.ouyang@liverpool.ac.uk

Yingli Li

School of Traffic and Transportation Engineering,
Central South University,
Changsha 410082, China
e-mail: liyingli@hnu.edu.cn

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received July 23, 2016; final manuscript received January 3, 2017; published online April 18, 2017. Assoc. Editor: Patrick S. Keogh.

J. Vib. Acoust 139(3), 034502 (Apr 18, 2017) (5 pages) Paper No: VIB-16-1365; doi: 10.1115/1.4035715 History: Received July 23, 2016; Revised January 03, 2017

A platform supported by a hexapod of quasi-zero-stiffness (QZS) struts is proposed to provide a solution for low-frequency vibration isolation in six degrees-of-freedom (6DOFs). The QZS strut is developed by combining a pair of mutually repelling permanent magnets in parallel connection with a coil spring. Dynamic analysis of the 6DOFs QZS platform is carried out to obtain dynamic responses by using the harmonic balance method, and the vibration isolation performance in each DOF is evaluated in terms of force/moment transmissibility, which indicates that the QZS platform perform a good function of low-frequency vibration isolation within broad bandwidth, and has notable advantages over its linear counterpart in all 6DOFs.

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Figures

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Fig. 1

Schematic diagram of the 6DOFs-QZS vibration isolation platform. (a) three-dimensional model, (b) arrangement of connecting points and QZS struts, and (c) QZS strut at the equilibrium position.

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Fig. 2

(a) Force and (b) stiffness versus displacement relationships of the QZS strut

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Fig. 3

Transmissibility of the QZS platform compared with its linear counterpart: (a) TFx, (b) TFy, (c) TFz, (d) TMx, (e) TMy, and (f) TMz. Solid lines and dashed lines denote theoretical results of the QZS system (QZS-T) and its linear counterpart, respectively, and hollow cycles represent numerical results of the QZS system (QZS-N).

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Fig. 4

Effects of damping on transmissibility (a) TFz and (b) TMz, when η=1%. Dashed lines denote unstable solutions in the case of ζ=0.01.

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Fig. 5

Effects of excitation amplitude on transmissibility (a) TFx and (b) TMx, when ζ=0.01. Dashed lines denote unstable solutions.

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