| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 93 === When the optical disk drive operates at high rotation speed, the inherent imbalance of the optical disk may cause large vibrations and prohibit data transfer. Therefore, how to reduce the imbalance vibrations of optical disk drives has been an important research topic. Ball-type automatic balancers are employed widely in optical disk drive industry. Most of the theoretical models developed for the ball-type automatic balancer only consider the planar translational vibrations. However, in additional to the translational vibration modes, the experimental platform used has torsional vibration mode. Hence, the theoretical model can’t explain all the experimental results. In this thesis, we designed a dual-stage suspension system that can only move translationally in a single plane. The governing equations of this dual-stage platform were derived under suitable assumptions. We then determined the equilibrium positions and studied the stability of each equilibrium position. The vibrational signals of the dual-state platform equipped with a ball-type automatic balancer were measured. The experimental results were compared with the theoretical results. We also investigated the vibration reduction effects of the ball-type automatic balancers equipped with different suspension systems.
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