The Effects of Disc-Vertical Deviation and Sound Absorbing Materials on Noise of DVD-ROMs

• Main Authors: Sheng-Tsung Chen, 陳聖宗
• Other Authors: Chao-Ming Wang
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/99792727351876823615

碩士 === 大同大學 === 機械工程學系(所) === 98 === Following by the development of information industry, the optical storage is changed dramatically. However, the issue of vibration and noise is largely increased with the progressing of the technology. Therefore, to find out the cause of noise of DVD-ROMs and to reduce the noise of DVD-ROMs are important engineering issues. There are two kinds of the noises generated when DVD-ROM running in high speed. The first one is aerodynamic noise and the cause is : the spindle motor drives disk rotating in high speed and the surrounded air would flow accordantly. Then the disk is vibrating due to the air flow which would cause noise. Another kind of noise is called structure vibration noise, which is generated by the vibration of DVD-ROM when spindle motor is running in high speed. In this paper will show the influence of the different Disc-Vertical Deviation of DVD-ROMs on noise under the various high speed of spindle motor. Moreover, noise absorptive foams are included in this study. The experiment included the following three conditions: without using noise absorptive foam, attached with high density noise absorptive foam, and low density noise absorptive foam. Finally, the optimal combination will be identified according to the result of this experiment.