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研究生： 謝長虹
Xie, Chang-Hong
論文名稱： 揚聲器音圈動態溫度響應
Estimation of loudspeaker voice-coil dynamic temperature response
指導教授： 陳朝光
Chen, Chao-Kuang
學位類別： 碩士
Master
系所名稱： 工學院 - 機械工程學系
Department of Mechanical Engineering
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 50
中文關鍵詞： 揚聲器 、音圈熱效應 、功率壓縮 、渦流熱效應
外文關鍵詞： Loudspeaker, Voice coil temperature, Power compression, Eddy current heating effect
相關次數： 點閱：162  下載：3 
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    • 動圈揚聲器能量轉換效率低，只有5%的電能被轉換為聲能。揚聲器失效很多時候是由於音圈高溫。本文對揚聲器的電、機、聲特性和熱特性進行了闡述，分析了這些特性之間的相互影響。討論了渦流熱效應和強迫對流熱傳對音圈溫度的影響，並且採用有限元方法提出了耦合模型。

    The efficiency of moving coil loudspeaker is very low. Roughly around 5% of electricity energy is transformed to acoustic energy and loudspeaker failure is mainly due to high temperature of voice coil. In this thesis, loudspeaker's electric, mechanical, acoustical and thermal behaviors have been studied, and the relationships between them have been discussed. The thesis focuses on the influence of Eddy current heating effect and convection cooling effect to the voice coil temperature. A conjugated FEM model is also raised.

    1. Introduction 1 1.1. Motivation 1 1.2. Background and existing paper 1 1.3. Thesis organization 2 1.4. Structural details 3 1.5. Power compression 5 2. Electro-mechanical model 7 2.1. Gyrator 7 2.2. Voice coil part 9 2.3. Mechanical part 12 2.4. Mechanic-acoustic transducer 14 2.5. Acoustic part 15 2.6. Summary analysis 17 3. Thermal model 20 3.1. Heat source 20 3.2. Heat transfer mechanisms 22 3.3. Thermal lumped-element circuit model 23 3.4. Measurements of temperature and thermal parameters 28 3.5. Summary of linear thermal model 30 3.6. Nonlinear model 31 4. FEM Model 35 4.1. COMSOL Multiphysics 35 4.2. Model construction 35 4.3. Temperature dependent Electro-mechanical model 38 4.4. Initial and boundary conditions of thermal model 39 4.5. FEM Thermal model 40 4.6. FEM Electro-mechanical model 43 4.7. Conjugated model results 46 5. Conclusion and future work 47 References 48

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