- 學位論文
使用田口法與灰關聯分析於光碟機噪音減低之最佳化設計
Optimum Design of Noise Reduction on CD-ROMs by Using Taguchi Method and Grey Relational Analysis
摘要
光碟片（Compact Disk；CD）是利用光能來做記錄與讀取之儲存媒體，具有高記錄密度（容量大）、可任意抽換，其使用範圍相當廣泛，不僅已成為音樂、電影、遊戲之民生消費品，更成為今日電腦資訊最主要的儲存媒體。因此，光碟機與DVD-ROM的品質要求也會越來越嚴格，而如何降低光碟機的噪音與振動就成為目前最重要的課題。 光碟機在高速運轉下所產生的噪音，其來源有二。第一是因為光碟片本身高速運轉，使得週遭的氣流也跟著流動，光碟片受到週遭氣流而造成擺動的現象，因而產生噪音，稱為空氣動力噪音。第二是因為光碟機主軸馬達在高速轉動時，與聯接基座產生的振動所引發的噪音，稱為結構振動噪音。 本論文是探討當改變光碟機之外殼材質及利用避振墊調整光碟機與外蓋之間隙之情況下，進而減少氣流之流動來探討光碟機之噪音影響變化，另一探討不同之吸音材質貼附在光碟機之外殼上來求得之噪音變化影響，並配合田口式方法配合商用軟體MINITAB以及灰關聯分析之最佳化來求得光碟機吸音之最佳設計。
並列摘要
Video disc (Compact Disk; CD) is the storing media that make use of light energy to write and read, has the high density of record (capacity is large), can substitute wantonly, its scope of application is quite extensive, have not merely already become the people's livelihood consumer goods of music, film, game, become the main storing media in computer information area of today even more. So, the required of the laser disc machine and DVD-ROM will be more and more strictness, too. At present, it has become the most important subject how to reduce the noise level and vibration. The noise operating and emerging of the laser disc machine at a high speed, there are two kinds. One is because the main shaft motor drives all video discs to operate at a high speed, make the air current of the surrounding area flow accordingly, the mere video disc is caused the phenomenon swung by the air current of surrounding area, and produced the noise, call the air motive force noise. Another one is a main shaft motor while rotating at a high speed, with the noise caused of vibration emerging of the laser disc machine, called the structure vibration noise. In this thesis, probe into the difference of noise level when change shell material of laser disc and utilize anti-shaking cushion to adjust the gap between laser disc machine and outer cover to reduce air flow rate. Another discussion is to get the noise influence in different absorbing sound material sticks on the shell of laser disc machine, then cooperate with the method “field mouth type” and commercial software MINITAB and the best Grey Relational analysis to get the best design of absorbing sound in laser disc.