臺灣博碩士論文加值系統

隨著科技的進步，聆聽音樂變得不再是貴族才享有的權利，已成為人們生活中不可或缺的休閒娛樂；受到聆聽者的感覺影響，音響的種類越來越多，每一種類之音箱類型均有其獨特性。音箱的箱體與結構，均會對聲場以及頻率響應有所影響，以同一顆揚聲器單體而言，雖然放置於相同容積的音箱內，但其體積及結構若有所不同，則著實大大影響了音響聲音特性及聲場。
本文針對在反射式音箱中揚聲器與導音孔位置、相距的距離及導音孔大小，對聲音特性及聲場之影響，透過有限元素法電腦輔助分析軟體COMSOL Multiphysics模擬分析改變導音孔與各發燒友設計之音箱，了解不同設計之導音孔與音箱之關係和相同容積下結構不同而造成的影響。由分析結果可知，導音孔位置與揚聲器同側和置於揚聲器之後方效果較好；音箱結構體複雜擁有較好的聲音特性及聲場表現。

With the development of sciences and techniques, listening to music is not only the right of aristocracy . It’s already become a kind of indispensable recreation in our normal life. There are many kinds of loudspeaker box, each species has its uniqueness. Different types of the loudspeaker box will effect on the frequency response and sound field.
This thesis will focus on the characteristics when put the speaker and sound hole’s at different position, change the distance from the speaker to sound hole or the different sound hole diameter of the vector loudspeaker box . Through the COMSOL Multiphysics simulation software to simulate, in order to understand the relation between sound hole and loudspeaker box, and with same box volume but different structure’s effect. As the result, when the speaker and sound hole’s position at the same side, or the sound hole’s position behind the speaker is better. If the loudspeaker box’s structures is more complex the characteristics will be better.

第一章 緒論
1-1前言
1-2研究動機與目的
1-3 文獻回顧
1-4論文架構
第二章 應用原理
2-1 等效電路理論
2-1.1 等效電學元件
2-1.2 等效機械元件
2-1.3 等效聲學元件
2-1.4 轉換機制
2-2 基本聲學元件
2-2.1 聲學輻射阻抗
2-2.2 管之聲學阻抗
2-2.3 音箱內聲場
2-3 音箱的設計與介紹
2-3.1 音箱理論
2-3.2 密閉式音箱
2-3.3 反射式音箱
2-3.4 導音管
2-4 軟硬體之介紹
2-4.1 COMSOL Multiphysics 介紹
2-4-2 SoundCheck 介紹
2-4.3 KLIPPEL 介紹
第三章 反射式音箱的模擬
3-1 揚聲器的基本介紹
3-2 揚聲器SPL量測
3-3 揚聲器的T-S參數
3-4 MPM量測技術
3-5 音箱的幾何模型
3-6 網格測試
3-7 PML層收斂性
3-8 阻擋電阻抗(Blocked Electric Impedance；Zb)
3-9 模擬流程
3-10 密閉式音箱量測、模擬結果
3-11 反射式模擬結果
3-11.1 開孔在前面
3-11.2 開孔在後面
3-11.3 開孔在左邊
3-11.4 開孔在右邊
3-11.5 開孔在前且有導音管
3-11.6 開孔在後且有導音管
第四章 比較不同幾何形狀的音箱
4-1 音箱幾何模型介紹
4-2 音箱模擬
4-3 設計新的反射式音箱
第五章 結論
5-1 結論
5-2 未來展望
參考文獻

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