- 學位論文
光碟機碟片間隙暨吸音泡棉對噪音影響之研究
The Effects of Disk-Tray Gap and Sound Absorbing Materials on Noise of CD-ROMs.
摘要
摘 要 隨著資訊產業的蓬勃發展，光儲存產品也隨其腳步一直變化。起先從CD-ROM，再來是DVD-ROM，到剛問世不久的藍光DVD。而新技術的產生，目的在於增加儲存容量和存寫速度。而存寫速度的提升，除了有賴軟體及新技術的發展外，還有另外一個重要的機械零件，那就是主軸馬達。 光碟機高速運轉產生的噪音，有兩種。一個是因為主軸馬達帶動光碟片高速運轉，使得週遭的氣流跟著流動，光碟片受到週遭氣流而造成擺動的現象，而產生噪音，稱空氣動力噪音。另一個是主軸馬達在高速轉動時，與光碟機產生的振動所引發的噪音，稱為結構振動噪音。 本論文藉由調整主軸馬達高度的方式，探討碟片與拖盤及上蓋的間隙對噪音的影響。另外加入吸音泡棉一起做探討研究，分別針對無泡棉貼附、高密度吸音泡棉及低密度吸音泡棉做實驗。最後搭配田口法找出最佳之搭配組合。
並列摘要
Abstract Following to the development of information industry, the optical storage device is changed dramatically; from CD-ROM to DVD-ROM and the latest blue DVD. The new technology increases the storage capacity and read/write speed. The improvement of read/write speed depends not only the new technologies and software, but also depends on the spindle motor, which is a key mechanical component. There are 2 kinds of noises generated when CD-ROM running in high speed. One is due to the spindle motor drives disk rotating in high speed, the surrounded air would flow accordantly. Disk is vibrating due to the air flow, which would cause noise and it is what so called aerodynamic noise. Another noise is called structure vibration noise, which is generated due to the vibration of CD-ROM when spindle motor is running in high speed. In this study, the space between disk and upper cover and between disk and bracket is discussed through adjusting the height of spindle motor in order to understand the impact respect to the noise level. Moreover, noise absorptive foams are included in this study. The experiment conditions include without using noise absorptive foam, attached with high density noise absorptive foam and low density noise absorptive foam. Finally, Taguchi method is used in order to identify the optimal combination.