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TECHNICAL PAPERS

The Dynamics of a Ball-Type Balancer System Equipped with a Pair of Free-Moving Balancing Masses

[+] Author and Article Information
Jaan-Rong Kang, Chang-Po Chao

Department of Mechanical Engineering, Chung-Yuan Christian University, Chung-Li, Taiwan 32023

Chun-Lung Huang, Cheng-Kuo Sung

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 300

J. Vib. Acoust 123(4), 456-465 (Apr 01, 2001) (10 pages) doi:10.1115/1.1385203 History: Received October 01, 2000; Revised April 01, 2001
Copyright © 2001 by ASME
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References

Takashi, K., Yoshihiro, S., Yoshiaki, Y., Shozo, S., and Shigeki, M., 1998, “Disk Type Storage Device,” Japanese Patent 10,092,094.
Kiyoshi, M., Kazuhiro, M., Shuichi, Y., Michio, F., Tokuaki, U., and Masaaki, K., 1997, “Disk Drive Device,” Japanese Patent 10,038,622.
Takatoshi, Y., 1998, “Disk Drive Device,” Japanese Patent 10,188,465.
Masaaki, K., 1998, “Disk Device,” Japanese Patent 10,208,374.
Thearle,  E. L., 1950, “Automatic Dynamic Balancers (Part 1 Leblanc Balancer),” Mach. Des., 22, Sept., pp. 119–124.
Thearle,  E. L., 1950, “Automatic Dynamic Balancers (Part 2-Ring, Pendulum, Ball Balancers),” Mach. Des., 22, Oct., pp. 103–106.
Inoue,  J., Jinnouchi,  Y., and Kubo,  S., “Automatic Balancers,” 1979, Trans. Jpn. Soc. Mech. Eng., Ser. C, 49, pp. 2142–2148.
Bövik,  P., and Högfors,  C., 1986, “Autobalancing of Rotors,” J. Sound Vib., 111, pp. 429–440.
Jinnouchi,  Y., Araki,  Y., Inoue,  J., Ohtsuka,  Y., and Tan,  C., 1993, “Automatic Balancer (Static Balancing and Transient Response of a Multi-Ball Balancer),” Trans. Jpn. Soc. Mech. Eng., Ser. C, 59, pp. 79–84.
Tadeusz,  M., 1988, “Position Errors Occurrence in Self Balancers Used on Rigid Rotors of Rotating Machinery,” Mech. Mach. Theory, 23, pp. 71–78.
Rajalingham,  C., and Rakheja,  S., 1998, “Whirl Suppression in Hand-held Power Tool Rotors Using Guided Rolling Balancers,” J. Sound Vib., 217, pp. 453–466.
Chung,  J., and Ro,  D. S., 1999, “Dynami Analysis of an Automatic Dynamic Balancer for Rotating Mechanism,” J. Sound Vib., 228, pp. 1035–1056.
Huang, Wei-Yu, Kang, Jaan-Rong, Sung, Cheng-Kuo, and Chao, Chang-Po, 2001, “An Application of Ball-Type Balancers on Radial Vibration Reduction of High-Speed Optic Disk Drives,” to appear in J. Sound Vib. .

Figures

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(a) The balls are contained in a cap that is placed on the top of the disk (b) the balls are integrated into the spindle motor and located under the turntable
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The mathematical model of the rotor
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Actions of forces and accelerations on the balancing balls (a) free body diagram (b) equivalent free body diagram (c) accelerations
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An illustration of steady-state positions of balancing balls
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Stability diagram of scaling parameter ε versus speed ratio p for Type I solutions
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Combined stability diagram of scaling parameter ε versus speed ratio p for Type II solutions
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Combined stability diagram of scaling parameter ε versus speed ratio p for Type III solutions
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Levels of residual radial vibration for stable Type I and III solutions, A, versus speed ratio; low curve: Type III-1, high curve: Type III-2
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Theoretical and simulated levels of residual radial vibration, A, versus speed ratio p for stable Type I and III-1 solutions; solid lines: theoretical predictions stars: simulated results

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