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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 李世光 | |
dc.contributor.author | Hsu-Ching Liao | en |
dc.contributor.author | 廖旭清 | zh_TW |
dc.date.accessioned | 2021-06-17T00:01:44Z | - |
dc.date.available | 2017-07-18 | |
dc.date.copyright | 2012-07-18 | |
dc.date.issued | 2012 | |
dc.date.submitted | 2012-07-15 | |
dc.identifier.citation | [1] http://www.pcstore.com.tw/589/M01023043.htm
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Rychkov, et al., 'Electret properties of polyethylene and polytetrafluoroethylene films with chemically modified surface,' IEEE Transactions on Dielectrics and Electrical Insulation, vol. 18, pp. 8-14, 2011. [18] W. C. Ko, et al., 'Charge storage and mechanical properties of porous PTFE and composite PTFE/COC electret,' e-polymers, 2010. [19] L. S. McCarty, and G. M. Whitesides, 'Electrostatic charging due to separation of ions at interfaces: Contact electrification of ionic electrets,' Angewandte Chemie-International Edition, vol. 47, pp. 2188-2207, 2008. [20] G. M. Sessler, 'Electrets: recent developments,' Journal of Electrostatics, vol. 51-52, pp. 137-145, 2001. [21] J. A. Giacometti, and O. N. Oliveira, Jr., 'Corona charging of polymers,' IEEE Transactions on Electrical Insulation, vol. 27, pp. 924-943, 1992. [22] S. Zhukov, and H. von Seggern, 'Breakdown-induced light emission and poling dynamics of porous fluoropolymers,' Journal of Applied Physics, Vol. 101, 2007. [23] Z. 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[34] http://www.laba.in/html/hangye/33.html [35] 顧泊廣,平板振膜揚聲器的崛起,視聽世界第 11 期,pp. 10-12,2003。 [36] http://ieplepwqysys.web-62.com/a/a/2012/0306/36.html [37] http://www.h-wit.com/school.asp?selectclassid=006001&id=214 [38] An Introduction to NXTR DML Technology, http://www.missionprofessional.com [39] http://140.127.6.133/lab/movie/ii.pdf [40] 莊啟正,複合材料積層板之振動模態分析,國立交通大學機械工程學系碩士 論文,pp. 22-51,2000。 [41] 戴建郎,平板受橢圓激震器激震之振動研究,國立交通大學機械工程學系碩 士論文,pp. 33-36,2005。 [42] J. N. Butters, and J. A .Leendertz, 'Holographic and Video Techniques Applied to Engineering Measurement', Journal of Measurement and Control, Vol. 4, pp. 349-354, 1971. [43] A. R. Ganesan, P. Meinlschmidt, and K. D. Hinsch, 'Vibrationmodeseparation using comparative Electronic Speckle Pattern Interferometry (ESPI) ', Optics and Lasers in Engineering, Vol. 107, pp. 28-31, 1994. [44] http://wwwme.nchu.edu.tw/~holo/Lab_introduction/espi.htm [45] R. 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Ko, et al., 'Use of 2-(6-mercaptohexyl) malonic acid to adjust the morphology andelectret properties of cyclic olefin copolymer and its application to flexible loudspeakers,' Smart Mater. Struct., vol. 19, 2010. [55] 曾建凱,可撓式駐極體揚聲器的研製:創新駐極體材料的開發與應用,國立 臺灣大學工程科學及海洋工程學系碩士論文,pp. 13-48,2010。 [56] Y. C. Chen, et al., 'Design and Experimental Verification of Cell Actuators in a FlexibleElectret-based Loudspeaker System,' in 21st International Conference on Adaptive Structuresand Technologies, Pennsylvania, 2010. [57] M. Abdel-Salam, et al., 'Electric fields and corona currents in needle-to-meshed plate gaps,' Journal of Applied Physics D: Applied Physics, vol. 40, Nub. 11, 2007. [58] http://www.kystech.com.tw/ep.htm [59] http://www.iea.com.tw/front/bin/home.phtml [60] http://www.docin.com/p-199845648.html [61] Brian Joyal, 'Constrained-Layer Systems Provide Weight-Efficient, High-level Damping,' E-A-R Specialty Composites, Aearo Company. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/65725 | - |
dc.description.abstract | 近年來,可撓的駐極體靜電式制動器被廣泛的討論,它具有輕薄可撓、低耗能、可任意剪裁及極佳的聲音品質…等特性,非常符合未來之應用趨勢,因此也發展出了駐極體揚聲器,然而駐極體揚聲器在低頻的表現卻不甚理想,其受到材料選用和結構設計所影響。
本論文將針對結構設計方面來作低頻響應的改進,駐極體揚聲器天生為陣列的小單體結構,使其有較佳的指向性並在中高頻率範圍有非常好的表現,但薄膜極小的振幅無法提供足夠的衝程來產生低頻的聲音。因此我們透過一個複合式的結構設計來補償低頻的不足,將一制動器放置於固有的背板上,藉由驅動制動器來推動板振動,進而得到較大的振幅來發出低頻的聲音,駐極體揚聲器黏貼於背板上負責中高頻段的聲音,如此即可形成一寬頻域的平面揚聲器。 在複合式揚聲器的設計上,將探討不同懸邊長度的振動板、不同的驅動位置以及振動板之材料等對頻率響應的影響,藉由有限元素分析軟體COMSOL進行板振動分析,並量測其聲壓位準(SPL)與頻率的關係來評判該設計的優劣。 最後,本論文成功研發出複合式平面揚聲器,從中了解結構、驅動位置和頻率響應的關係,材料特性對聲阻匹配與阻尼的關係,並利用等化器的調整,得到相當平滑的頻率響應曲線,於180 Hz達66 dB,在1 kHz至20 kHz平均有75 dB以上的表現。 | zh_TW |
dc.description.abstract | Recently, the development of flexible electret based electrostatic actuator has been widely discussed. The device was known to be light weight, flexible, energy saving, can be cut to any shape and have high sound quality. These characteristics were in line with many potential future applications, which propel the development of electret loudspeakers. However, the performance of the electret loudspeaker in low frequency is poor due to material selection and structure design.
In the thesis, the structure design was used to improve the response in low frequency. Electret loudspeakers inherently are array of cell structure, so they have excellent directivity and good responses in mid to high frequency range. Nevertheless, the vibration amplitude of electret film is too small to supply enough strokes to generate the sound in low frequency. The design of composite structure was used to compensate for the lack of low frequency response. We added an actuator on the back plate to drive the plate to enhance the audible frequency range performance. That is, it is expected that the integration of the low frequency sound generated by the plate vibration and the mid to high frequency sound radiated by electret loudspeakers can lead to high performance wide-band flat loudspeaker. In this paper, the choice of the driving position, different length of suspension and material of vibration plate were discussed. By using finite element analysis software COMSOL, the vibration of the plate was simulated and analyzed. Then, sound pressure level (SPL) was used to evaluate the performance of loudspeakers. Finally, the composite flat loudspeaker was developed in this thesis. We learned about the relationship among the driving positions, the structure relationship and the frequency response. The relationship among the material, impedance matching and damping were also explored. Using the equalizer, smooth frequency response curve can be obtained. The sound pressure of 66 dB was achieved at 180 Hz and the average sound pressure was maintained at higher than 75 dB from 1 kHz to 20 kHz. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T00:01:44Z (GMT). No. of bitstreams: 1 ntu-101-R99525014-1.pdf: 6587991 bytes, checksum: 2dbc7448ff08675889b1e767228d95e1 (MD5) Previous issue date: 2012 | en |
dc.description.tableofcontents | 中文摘要 ii
ABSTRACT iii 目錄 v 圖目錄 vii 表目錄 xi 第 1 章 緒論 1 1.1 前言 1 1.2 揚聲器介紹 2 1.3 研究動機與目的 5 1.4 文獻回顧 6 1.5 論文架構 13 第 2 章 理論推導與介紹 14 2.1 揚聲器驅動原理 14 2.1.1 靜電揚聲器驅動原理 14 2.1.2 駐極體揚聲器驅動原理 17 2.2 平板力學理論 19 2.2.1 位移與應變關係 19 2.2.2 應力與應變關係 20 2.3 壓電力學理論 23 2.3.1 壓電本構方程式 23 2.3.2 雙壓電式樑振動 25 2.3.3 壓電與彈性板振動 28 2.4 聲學理論 31 2.4.1 聲壓波動方程式 31 2.4.2 聲壓位準 33 2.4.3 音程 34 第 3 章 駐極體揚聲器的研製與量測架設 36 3.1 駐極體揚聲器的製程 36 3.2 駐極體極化系統架設 41 3.2.1 電暈放電介紹 41 3.2.2 電暈放電系統 43 3.3 靜電量測系統架設 46 3.4 聲學量測系統架設 49 3.5 駐極體揚聲器實驗結果 51 3.5.1 駐極體揚聲器之聲學特性 51 3.5.2 駐極體駐電均勻性 52 3.5.3 駐極體揚聲器的可剪裁性 53 第 4 章 柔性結構板設計分析與結果討論 54 4.1 位移放大機構介紹 55 4.1.1 內部位移放大機構 55 4.1.2 外部位移放大機構 57 4.2 COMSOL有限元素分析 59 4.3 實驗量測架設 61 4.3.1 ESPI模態量測 61 4.3.2 聲學特性量測 63 4.4 振動板設計分析與實驗結果 64 4.4.1 懸邊長度對柔性結構板之影響 64 4.4.2 不同驅動位置對結構板之影響 70 4.4.3 振動板材料之影響 85 4.4.4 駐極體揚聲器與振動板的結合 95 第 5 章 結論與未來展望 100 5.1 結論 100 5.2 未來展望 101 參考文獻 102 | |
dc.language.iso | zh-TW | |
dc.title | 補償駐極體揚聲器低頻響應之柔性結構板設計與分析 | zh_TW |
dc.title | Enhancing Low-Frequency Response of the Electret Loudspeaker by Flexible Structure Plate Design and Analysis | en |
dc.type | Thesis | |
dc.date.schoolyear | 100-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 吳政忠,吳文中,謝志文,柯文清 | |
dc.subject.keyword | 駐極體,平面揚聲器,複合結構,柔性結構板,致動器, | zh_TW |
dc.subject.keyword | electret,flat loudspeaker,composite structure,flexible structure plate,actuator, | en |
dc.relation.page | 105 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2012-07-16 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
顯示於系所單位: | 工程科學及海洋工程學系 |
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