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Research Papers

Optimal Design and Experimental Study of a Multidynamic Vibration Absorber for Multifrequency Excitation

[+] Author and Article Information
Xi Wang

Institute of Vibration, Shock and Noise,
State Key Laboratory of Mechanical System
and Vibration,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: wangxi028@foxmail.com

Bintang Yang

Institute of Vibration, Shock and Noise,
State Key Laboratory of Mechanical System
and Vibration,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: btyang@sjtu.edu.cn

Hu Yu

Institute of Vibration, Shock and Noise,
State Key Laboratory of Mechanical System
and Vibration,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: sj.yuhu@sjtu.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 June 20, 2016; final manuscript received January 6, 2017; published online April 24, 2017. Assoc. Editor: John Judge.

J. Vib. Acoust 139(3), 031011 (Apr 24, 2017) (7 pages) Paper No: VIB-16-1313; doi: 10.1115/1.4035781 History: Received June 20, 2016; Revised January 06, 2017

The inevitable manufacturing errors of rotational machineries cause vibration of multifrequency. This paper presents a multidynamic vibration absorber (MDVA) to suppress the vibration of multifrequency. The MDVA consists of two parts, and each part includes three dynamic vibration absorbers (DVAs) with equal mass but different stiffness values. In order to improve the robustness of the system, an optimization method to obtain the optimal damping values of each DVA is proposed based on dynamic response. The objective function of optimization aims to flatten the frequency response of the primary system with the changeable excitation and reduce the vibration level in a limited frequency bandwidth. The multifrequency vibration suppression is experimentally verified. To achieve the optimal damping values, the magnetic dampers are applied in the tests. The experimental results indicate that the sensitivity of the system is reduced and the robustness of the system is enhanced, which are coincident with the simulations.

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References

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Figures

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Fig. 1

Single-degree-of-freedom structure with MDVA

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Fig. 2

Frequency distribution of the MDVA

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Fig. 3

Frequency response of the primary system with the single-frequency excitation: (a) primary system with MDVA-1 or single DVA and (b) primary system with MDVA-2 or single DVA

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Fig. 4

Frequency response of the primary system with the multifrequency excitation: (a) before optimizing and (b) after optimizing

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Fig. 5

MDVA for experimental verification: (a) experimental setup of the MDVA and (b) schematic diagram of the experimental MDVA

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Fig. 6

Frequency response of the primary system

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Fig. 7

Time response of the primary system with the multifrequency excitation

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Fig. 8

Comparison of vibration suppression with different absorbers

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Fig. 9

Magnetic damper: (a) schematic diagram and (b) experimental setup

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Fig. 10

Experimental results of the parameters optimizing: (a) before optimizing and (b) after optimizing (the maximum vibration amplitude is decreased and flatted by the magnetic dampers)

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