光碟机系统之模态分析  

Modal Analysis of the CD-ROM Drive System

作　　者：呂鴻猷(Hung-Yu Lu) 李志鴻(Chih-Hung Li) 黃致誠(Zhi-Cheng Huang) 

出　　处：《應用聲學與振動學刊》

摘　　要：为降低光碟机在高速回转下之振动，许多研究致力於减振技术之探讨。一般常见的避振器大都使用橡胶阻尼居多，其原因乃橡胶阻尼的避振效果良好，成本低廉且安装容易。本研究以上、下钢板结合橡胶阻尼建构成模拟光碟机系统，并分析其振动之模态与频率。文中以ANSYS有限元素软体为主要工具，藉由模态分析获得模拟光碟机系统之振动模态与相对应之频率。此外，应用雷射都卜勒振动仪为实验设备，量测模拟光碟机系统之共振频率，进而与分析结果相互验证。研究结果显示，ANSYS模态分析之频率响应值与雷射都卜勒振动仪所量测之共振频率极为接近，两者间之差异约在0.42%至4.08%之间。因此，本有限元素分析模型对相关系统之开发设计可提供实质的贡献。There are many vibration reduction techniques have been studied for reducing vibrations of CD-ROM drive under high speed of rotation. Due to good property of vibration absorption, low cost and easy installation, many rubber dampers are being used as the absorbers. In this paper, the frequency response of simulated CD-ROM drive system created by consisting upper and lower steel plates and rubber damper is studied. ANSYS is used as the main tool to carry out the model analysis of simulated CD-ROM drive system in order to find the mode shapes and the corresponding frequencies. In addition, Laser Doppler Vibrometer is used as the experimental instrument to measure the resonance frequency of simulated CD-ROM drive system. The measured results are then verified with the analyzed results from modal analysis. It shows that the frequency response obtained from modal analysis by using ANSYS are very close to the measured results from vibrometer, and the variation is in the small range of 0.42% to 4.08%. Therefore, the finite element analysis model can provide real contribution to the development and design of simulated CD-ROM drive system.

关 键 词：光碟機 橡膠阻尼 模態分析 雷射都卜勒振動儀