This study is dedicated to evaluate the performance of an automatic ball-type balancer system (ABS) installed in optical disk drives (ODDs) with consideration of the relative torsional motion between the ODD case and the spindle-disk-ABS-turntable system, noting that the turntable is the supporting plate structure for disk, pickup, and spindle motor inside the ODD. To this end, a complete dynamic model of the ABS considering the torsional motion is established with assuming finite torsional stiffness of the damping washers, which provides suspension of the spindle-disk-ABS-turntable system to the ODD case. Considering the benchmark case of a pair of balancing balls in an ABS, the method of multiple scales is then applied to formulate a scaled model for finding all possible steady-state solutions of ball positions and analyzing corresponding stabilities. The results are used to predict the levels of residual vibration, with which the performance of the ABS can then be reevaluated. Numerical simulations are conducted to verify theoretical results. It is deduced from both analytical and numerical results that the spindle speed of an ODD could be operated above both primary translational and secondary torsional resonances in order to guarantee stabilization of the desired balanced solution for a substantial vibration reduction.
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e-mail: pchao@cycu.edu.tw
e-mail: cksung@pme.nthu.edu.tw
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November 2005
Technical Papers
Dynamic Analysis of the Optical Disk Drives Equipped with an Automatic Ball Balancer with Consideration of Torsional Motions
Paul C. P. Chao,
Paul C. P. Chao
Department of Mechanical Engineering,
e-mail: pchao@cycu.edu.tw
Chung-Yuan Christian University
, Chung-Li, Taiwan 320
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Cheng-Kuo Sung,
Cheng-Kuo Sung
Department of Power Mechanical Engineering,
e-mail: cksung@pme.nthu.edu.tw
National Tsing Hua University
, Hsinchu, Taiwan 300
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Chun-Chieh Wang
Chun-Chieh Wang
Department of Power Mechanical Engineering,
National Tsing Hua University
, Hsinchu, Taiwan 300
Search for other works by this author on:
Paul C. P. Chao
Department of Mechanical Engineering,
Chung-Yuan Christian University
, Chung-Li, Taiwan 320e-mail: pchao@cycu.edu.tw
Cheng-Kuo Sung
Department of Power Mechanical Engineering,
National Tsing Hua University
, Hsinchu, Taiwan 300e-mail: cksung@pme.nthu.edu.tw
Chun-Chieh Wang
Department of Power Mechanical Engineering,
National Tsing Hua University
, Hsinchu, Taiwan 300J. Appl. Mech. Nov 2005, 72(6): 826-842 (17 pages)
Published Online: March 24, 2005
Article history
Received:
May 23, 2003
Revised:
March 24, 2005
Citation
Chao, P. C. P., Sung, C., and Wang, C. (March 24, 2005). "Dynamic Analysis of the Optical Disk Drives Equipped with an Automatic Ball Balancer with Consideration of Torsional Motions." ASME. J. Appl. Mech. November 2005; 72(6): 826–842. https://doi.org/10.1115/1.2041659
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