Research Papers

An Online Active Balancing Method Using Magnetorheological Effect of Magnetic Fluid

[+] Author and Article Information
Xining Zhang

State Key Laboratory for Manufacturing
System Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: zhangxining@mail.xjtu.edu.cn

Xinrui Xia

State Key Laboratory for Manufacturing
System Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: xiaxinrui2@gmail.com

Zhou Xiang

State Key Laboratory for Manufacturing
System Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: 530969941@qq.com

Yanan You

State Key Laboratory for Manufacturing
System Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: 1479394566@qq.com

Bing Li

State Key Laboratory for Manufacturing
System Engineering,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: lbtv.xjtu@stu.xjtu.edu.cn

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received October 20, 2017; final manuscript received June 22, 2018; published online August 13, 2018. Assoc. Editor: Costin Untaroiu.

J. Vib. Acoust 141(1), 011008 (Aug 13, 2018) (9 pages) Paper No: VIB-17-1465; doi: 10.1115/1.4040675 History: Received October 20, 2017; Revised June 22, 2018

The improvement of machining efficiency and precision puts forward new requirements for the balancing performance of machine tool spindle. Work piece quality can be effectively improved by implementing the active balance on the spindle. In this paper, a new active balancing method using magnetorheological (MR) effect of magnetic fluid is proposed. The mechanism of forming compensation mass by changing the distribution of magnetic fluid under local magnetic field is expounded. Experiments are carried out to verify the feasibility of the proposed method. Profile lines of magnetic fluid surface shape at different positions are measured with linear laser projection measurement method in experiments. Three-dimensional (3D) surface shape of the magnetic fluid is reconstructed by the synthesis of the measured profile lines. Experiments demonstrate that mass center of the magnetic fluid increases with the strength of magnetic field. Thus, the feasibility of the proposed method is verified experimentally. In order to weaken the vibration of machine tool spindle using this method, a balancing device is designed, which includes magnetic fluid chambers and three conjugated C-type electromagnets arranged at 120 deg intervals. For each electromagnet, the relationship among compensation mass (the corresponding balancing mass), excitation current, and rotation speed is established. Also, the performance of the balancing device is further proved in experiments conducted on the experimental platform. The imbalance vibration amplitude of the test spindle decreased by an average of 87.9% indicates that the proposed active balancing method in this paper is promising.

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Fig. 3

Block diagram of the balance system using magnetic fluid

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Fig. 4

The structure of balancing device. (a) Front view of whole structure, (b) Vertical view of whole structure, and (c) structure of the electromagnet.

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Fig. 2

Distribution of magnetic fluid in chambers of balancing device. (a) Mass distribution without local magnetic field and (b) mass distribution under local magnetic field.

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Fig. 1

Change of surface shape and distribution of magnetic fluid under local magnetic field

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Fig. 5

(a) Analysis of magnetic induction and (b) curve of magnetic induction intensity in air gap

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Fig. 6

Three-point synthesis strategy of compensation mass

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Fig. 7

Linear laser projection measurement method

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Fig. 9

Measured surface shape of magnetic fluid under different magnetic fields (a) one magnet, (b) two magnets, and (c) three magnets

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Fig. 10

(a) Compensation mass generated by each electromagnet and (b) difference of the results obtained from vector synthesis and experiments

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Fig. 11

Diagram of experiment bench

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Fig. 12

Flowchart of the balancing experiment



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