導音管風切音及音膜特性的理論分析與實驗量測

洪國彭

doi:10.6342/NTU201600627

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導音管風切音及音膜特性的理論分析與實驗量測

Theoretical Analysis and Experimental Measurements on the Characteristics for Diaphragm and the Noise of Port

洪國彭 , Masters　　Advisor：馬劍清　　

繁體中文 DOI： 10.6342/NTU201600627

夾具；邊界條件；音膜彎曲剛性；音膜阻尼比；導音管；低音反射式音箱；寬帶噪音；有限元素分析；駐波理論； fixture ； boundary condition ； stiffness of diaphragm ； damping ratio of diaphragm ； port ； bass-reflex ； broad-band noise ； finite element analysis ； theory of standing wave

Abstract │ Reference (36) │ Altmetrics

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With the continuous improvement and rapid development of technology, the demand for high quality of loudspeaker are increased. Electro-acoustic industry particularly focus on the development of speakers, to make products much smaller, thinner, and easy to carry. Though the working principle of speakers is considerably uncomplicated and the technology of speakers has been developed for a long time. However manufacturing a high-quality speaker with sweet-sounding voice and low distortion is still a difficult issue. Preference for voice is distinct for people, thus the task about designing a perfect speaker to satisfy different users is worthy of being discussed.
	The main purpose of this research focuses on theoretical analysis, numerical analysis and experimental measurements on the influence of dynamic characteristics for diaphragm, and port in loudspeaker system. The content of this thesis is divided into two parts. The content of this thesis is ranged into two parts. The first topic of this thesis is to
	The first topic of this thesis is to research the mechanical characteristics of materials for diaphragms by experimental measurement, and design fixtures to provide fine boundary condition. The stiffness of the diaphragm is measured by the Nano-indentation and air pressure pushing of the thin film for diaphragms. The damping ratio of the diaphragm in distinct exciting frequency is determined by measuring the dynamic signals of the different thickness and material of diaphragm on the basis of vibration theory by laser displacement sensor.
	The second topic of this thesis is to perform the analysis to appraise the characteristics of broad-band noise generated from small bass-reflex loudspeaker. To begin with, we find the Bandwidth with stronger noise from system to obtain exciting frequencies. The noise strength of different diameter and length for port by the finite element analysis, consequently we can get principal direction to design port. Furthermore, the correctness of simulation is verified by experiment. We compare resonant frequency of chuffing for different port by experiment, simulation and standing wave theory. Finally, we change the shape of port to attempt to reduce the noise strength.by above-mentioned step.

Reference ( 36 ) 〈TOP〉

[1] 林致達，劉興華, "微型喇叭聲學特性測試與模擬," 碩士論文, 車輛工程研究所, 臺北科技大學, 2006.
連結：
[2] 蔡長安，劉興華, "微型喇叭音箱及出音孔之設計與分析," 碩士論文, 車輛工程研究所, 臺北科技大學, 2007.
連結：
[8] 郭天立，王昭男, "揚聲器初步設計所需之參數研究," 碩士論文, 工程科學及海洋工程研究所, 臺灣大學, 2014.
連結：
[10] 趙浚瑜，馬劍清, "超磁致伸縮材料、層狀壓電壓磁複合材料及磁場動圈式揚聲器動態特性之分析與量測," 碩士論文, 機械工程研究所, 臺灣大學, 2014.
連結：
[11] 吳柍蓁，馬劍清, "振膜、導音管及調音布對於揚聲器系統動態特性的影響分析與量測," 碩士論文, 機械工程研究所, 臺灣大學, 2015
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