A 6DOF passive vibration isolator using X-shape supporting structures

Zhijing Wu; Xingjian Jing; Bo Sun; Fengming Li

doi:10.1016/j.jsv.2016.06.004

A 6DOF passive vibration isolator using X-shape supporting structures

Zhijing Wu
, Xingjian Jing^*
, Bo Sun
, Fengming Li

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

173 Citations (Scopus)

Abstract

A novel 6 degree of freedom (6-DOF) passive vibration isolator is studied theoretically and validated with experiments. Based on the Stewart platform configuration, the 6-DOF isolator is constructed by 6 X-shape structures as legs, which can realize very good and tunable vibration isolation performance in all 6 directions with a passive manner. The mechanic model is established for static analysis of the working range, static stiffness and loading capacity. Thereafter, the equation of motion of the isolator is derived with the Hamilton principle. The equivalent stiffness and the displacement transmissibility in the six decoupled DOFs direction are then discussed with experimental results for validation. The results reveal that (a) by designing the structure parameters, the system can possess flexible stiffness such as negative, quasi-zero and positive stiffness, (b) due to the combination of the Stewart platform and the X-shape structure, the system can have very good vibration isolation performance in all the 6 directions and in a passive manner, and (c) compared with the simplified linear-stiffness legs, the nonlinearity of the X-shape structures enhance the passive isolator to have much better vibration isolation performance.

Original language	English
Pages (from-to)	90-111
Number of pages	22
Journal	Journal of Sound and Vibration
Volume	380
Online published	24 Jun 2016
DOIs	https://doi.org/10.1016/j.jsv.2016.06.004
Publication status	Published - 13 Oct 2016
Externally published	Yes

Funding

The authors would like to thank anonymous reviewers and handling editors for their useful comments and constructive suggestions, which do help improving the quality of this paper. The authors also gratefully acknowledge the support from the NSFC project (No. 61374041) of China, and the GRF project (No. 15206514) of the Hong Kong RGC.

Research Keywords

6-DOF isolator
Stewart platform
Passive vibration isolation
Nonlinearity
SYSTEM
STIFFNESS
DESIGN
SPACE

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title = "A 6DOF passive vibration isolator using X-shape supporting structures",

abstract = "A novel 6 degree of freedom (6-DOF) passive vibration isolator is studied theoretically and validated with experiments. Based on the Stewart platform configuration, the 6-DOF isolator is constructed by 6 X-shape structures as legs, which can realize very good and tunable vibration isolation performance in all 6 directions with a passive manner. The mechanic model is established for static analysis of the working range, static stiffness and loading capacity. Thereafter, the equation of motion of the isolator is derived with the Hamilton principle. The equivalent stiffness and the displacement transmissibility in the six decoupled DOFs direction are then discussed with experimental results for validation. The results reveal that (a) by designing the structure parameters, the system can possess flexible stiffness such as negative, quasi-zero and positive stiffness, (b) due to the combination of the Stewart platform and the X-shape structure, the system can have very good vibration isolation performance in all the 6 directions and in a passive manner, and (c) compared with the simplified linear-stiffness legs, the nonlinearity of the X-shape structures enhance the passive isolator to have much better vibration isolation performance.",

keywords = "6-DOF isolator, Stewart platform, Passive vibration isolation, Nonlinearity, SYSTEM, STIFFNESS, DESIGN, SPACE",

author = "Zhijing Wu and Xingjian Jing and Bo Sun and Fengming Li",

year = "2016",

month = oct,

day = "13",

doi = "10.1016/j.jsv.2016.06.004",

language = "English",

volume = "380",

pages = "90--111",

journal = "Journal of Sound and Vibration",

issn = "0022-460X",

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T1 - A 6DOF passive vibration isolator using X-shape supporting structures

AU - Wu, Zhijing

AU - Jing, Xingjian

AU - Sun, Bo

AU - Li, Fengming

PY - 2016/10/13

Y1 - 2016/10/13

N2 - A novel 6 degree of freedom (6-DOF) passive vibration isolator is studied theoretically and validated with experiments. Based on the Stewart platform configuration, the 6-DOF isolator is constructed by 6 X-shape structures as legs, which can realize very good and tunable vibration isolation performance in all 6 directions with a passive manner. The mechanic model is established for static analysis of the working range, static stiffness and loading capacity. Thereafter, the equation of motion of the isolator is derived with the Hamilton principle. The equivalent stiffness and the displacement transmissibility in the six decoupled DOFs direction are then discussed with experimental results for validation. The results reveal that (a) by designing the structure parameters, the system can possess flexible stiffness such as negative, quasi-zero and positive stiffness, (b) due to the combination of the Stewart platform and the X-shape structure, the system can have very good vibration isolation performance in all the 6 directions and in a passive manner, and (c) compared with the simplified linear-stiffness legs, the nonlinearity of the X-shape structures enhance the passive isolator to have much better vibration isolation performance.

AB - A novel 6 degree of freedom (6-DOF) passive vibration isolator is studied theoretically and validated with experiments. Based on the Stewart platform configuration, the 6-DOF isolator is constructed by 6 X-shape structures as legs, which can realize very good and tunable vibration isolation performance in all 6 directions with a passive manner. The mechanic model is established for static analysis of the working range, static stiffness and loading capacity. Thereafter, the equation of motion of the isolator is derived with the Hamilton principle. The equivalent stiffness and the displacement transmissibility in the six decoupled DOFs direction are then discussed with experimental results for validation. The results reveal that (a) by designing the structure parameters, the system can possess flexible stiffness such as negative, quasi-zero and positive stiffness, (b) due to the combination of the Stewart platform and the X-shape structure, the system can have very good vibration isolation performance in all the 6 directions and in a passive manner, and (c) compared with the simplified linear-stiffness legs, the nonlinearity of the X-shape structures enhance the passive isolator to have much better vibration isolation performance.

KW - 6-DOF isolator

KW - Stewart platform

KW - Passive vibration isolation

KW - Nonlinearity

KW - SYSTEM

KW - STIFFNESS

KW - DESIGN

KW - SPACE

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U2 - 10.1016/j.jsv.2016.06.004

DO - 10.1016/j.jsv.2016.06.004

M3 - RGC 21 - Publication in refereed journal

SN - 0022-460X

VL - 380

SP - 90

EP - 111

JO - Journal of Sound and Vibration

JF - Journal of Sound and Vibration

ER -

A 6DOF passive vibration isolator using X-shape supporting structures

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Research Keywords

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