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Research Papers

An Improvement to Holospectrum Based Field Balancing Method by Reselection of Balancing Object

[+] Author and Article Information
Yuhe Liao

State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. Chinayhliao@mailst.xjtu.edu.cn

Genfeng Lang

State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. Chinalalal2112@stu.xjtu.edu.cn

Fangji Wu

State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. Chinawfj_ridc@sohu.com

Liangsheng Qu

State Key Laboratory for Manufacturing Systems Engineering, School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, P.R. Chinalqu@mail.xjtu.edu.cn

J. Vib. Acoust 131(3), 031005 (Apr 21, 2009) (7 pages) doi:10.1115/1.3085880 History: Received January 06, 2008; Revised December 16, 2008; Published April 21, 2009

In this paper, the holospectrum technique based balancing method has been improved by reselection of the balancing object. Current holospectrum based balancing technique uses the initial phase vector (IPV) as the balancing object. Theoretical analysis of the precession behavior of an unbalanced rotor with anisotropic stiffness shows that, compared with the IPV, its forward precession component vector is much better in describing the rotor balance state and is more suitable to be used as the measurement of unbalance response. After the backward precession component is removed, the impact of probe orientation on the balancing analysis and calculation is completely eliminated and the computational procedure is greatly simplified without sacrificing the balancing precision. The experiments and field application cases verify the accuracy and effectiveness of this method.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

The shaft orbit and the detecting coordinates system

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Figure 2

Test rig layout and arrangement of the probes

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Figure 3

The trend of the precession components (r+: ○—— and r−:◻——) at (a) Sec. 1 and (b) Sec. 2

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Figure 4

The impact of the improvement of rotor balance on (a) IPV+ and (b) IPV−

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Figure 5

(a) The original vibration, (b) balancing effect using IPV+ scheme, (c) balancing effect using single X scheme, and (d) balancing effect using single Y scheme

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Figure 6

The sketch map of the 300 MW turbine generator set

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Figure 7

(a) The original vibration, (b) the comparison between the original vibration (thin line) and the final balancing effect (bold line), (c) the comparison between the original vibration (thin line) and the second trial run (bold line), and (d) the comparison between the original vibration (thin line) and the third trial run (bold line)

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