| Summary: | 碩士 === 大同大學 === 機械工程學系(所) === 95 === With development of information technology, high speed of CD-ROMs is manufactured. However, the issue of vibration and noise is focused with increase of the rotational speed. Therefore, to investigate the noise mechanism of CD-ROMs and to reduce the noise of CD-ROMs are important engineering issues. The optical storage device is changed dramatically: from CD-ROMs to DVD-ROMs and the latest blue DVDs with development of information industry. The new technology increases the storage capacity and read/write speed. The improvement of read/write speed not only depends on the new technologies and software, but also depends on the spindle motor, which is a key mechanical component. The rotation speed of spindle motor is limited to the maximum speed of 10,000RPM because high rotation speed may causes damage of CDs. There are two sources of the noises resulting from the CD-ROMs spinning at a high speed. The first source is the aerodynamic noise of the vibration of the disc due to the airflows of the high-speed spinning disc. The second source is the structural noise of the axle motor of the CD-ROMs vibrating with the joint base.
In order to reduce noise, the choice and location of absorption materials, and the gap between CDs and plates are considered in this research. Besides, Taghchi methods and MINITAB are used to identify the optimal designs, and the comparison between calculations and experiments is mentioned in this research.
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