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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 | JEN-HSUAN HO | en |
dc.contributor.author | 賀仁萱 | zh_TW |
dc.date.accessioned | 2021-06-14T16:50:11Z | - |
dc.date.available | 2013-08-04 | |
dc.date.copyright | 2008-08-04 | |
dc.date.issued | 2008 | |
dc.date.submitted | 2008-07-30 | |
dc.identifier.citation | [1] M. Colloms, High Performance Loudspeakers, 6th ed., John Wiley & Sons, UK, 2005.
[2] 馬大猷、沈豪,聲學手冊,北京,科學出版社,1984。 [3] 吳朗,電子陶瓷:壓電陶瓷,全新資訊圖書股份有限公司,民國八十三年十二月。 [4] 王以真,實用揚聲器工藝手冊,國防工業出版社,北京, 2005。 [5] G, Bank, “The distributed mode loudspeaker”, in Loudspeaker and Headphone Handbook (Borwick J Ed), 3rd ed., Focal Press, 2001. [6] H. Azima, ‘‘NXT, Up Against Wall,’’ Audio Magazine, September, pp.34–41, 1998. [7] http://www.nxtsound.com/index.php?id=367 [8] H. F. Azima, M. Colloms, and Neil John Harris, “Acoustic Device,” U. S. Patent 6,332,029, December 18, 2001. [9] H. F. Tiersten, Linear piezoelectric plate vibrations, Plenum press, New York, 1969. [10] J. F. Nye, Physical Properties of Crystals: Their Representation by Tensors and Matrices, Oxford University Press, 1985. [11] Y. Wada and R. Hayakawa, “Piezoelectricity and Pyroelectricity of Polymers,” Jpn, J. Appl. Phys., Vol. 15, No. 11, pp. 2041-2057, November 1976. [12] H. W. Katz, “Solid State Magnetic and Dielectric Devices,” Wiley, New York, pp. 94-126, 1959. [13] ANSI/IEEE Standard 176, Piezoelectricity, The Institute of Electrical and Electronics Engineers, Inc. September 1987. [14] C.K. Lee, “Piezoelectric Laminates for Torsion and Bending Modal Control: Theory and Experiment,” Ph.D. Dissertation, Department of Theoretical and Applied Mechanics, Cornell University, 1987. [15] H. -T. Hu, Theory of Plates, Taiwan. 2001. [16] http://en.wikipedia.org/wiki/Bessel_function [17] C. R. Wylie, and L. C. Barrett, Advanced Engineering Mathematic, 6th ed., McGraw-Hill, New York, 1995. [18] J. Yang, The Mechanics of Piezoelectric Structures, World Scientific, USA, 2005. [19] J. S. Yang and J. D. Yu, “Equations for a laminated piezoelectric plate,” Archive of Applied Mechanics, Vol. 45, pp.653-664, 1993. [20] J. S. Yang, X. M. Yang and J. A. Turner, “Amplification of acoustic waves in laminated piezoelectric semiconductor plates,” Archive of Applied Mechanics, Vol. 74, pp. 288-298, 2004. [21] A. H. Meitzler, H. F. Tiersten, A. W. Warner, D. Berlincourt, G. A. Couqin and F. S. Welsh, III, IEEE Standard on Piezoelectricity, IEEE, New York, 1988. [22] L. E. Kinsler, A. R. Frey, A. B.Coppens, and J. V. Sanders, Fundamentals of Acoustics, 4th ed., John Wiley & Sons, USA, 2000. [23] P. M. Morse, and K. U. Ingard, Theoretical Acoustics, McGraw-Hill, London, 1968. [24] S. Temkin, Elements of Acoustics, John Wiley & Sons, 1981. [25] 馬劍清,壓電元件於不同介質中的動態特性研究與實驗量測,國立台灣大學機械工程學研究所博士論文,2004。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/40524 | - |
dc.description.abstract | 本文將提出一種以結構設計的方式來改變壓電式喇叭的振動行為進而優化其音頻響應。一般來說,壓電喇叭具有高Q值的特性,使得其頻率響應在共振頻附近會有非常地尖銳的起伏,這種特性限制了壓電喇叭的應用範圍。本文所做的探討將不侷限於一般喇叭研發僅針對其剛體運動部分的改善,而是更完整地分析振動板的所有振動模態與其產生聲壓之關聯性,並以優化其音頻響應為目的以結構設計方式對振動模態作被動式的控制。此方式能抑制過高聲壓的振動幅度並破壞因對稱相消性而使聲壓低弱的對稱型模態,使其能有效改善壓電喇叭的音頻響應。此外,一種針對壓電式喇叭的陣列組合模式也將在本文提出。設計過程中並以有限元素分析法來作為輔助工具,透過結合結構改善與陣列組合設計,能有效改善陣列式壓電喇叭的音頻響應,未來將能使此種具體積輕薄與高效率之喇叭廣泛應用在各類視聽產品上。 | zh_TW |
dc.description.abstract | An effective structural design for a piezoelectric loudspeaker with improved frequency response is proposed in this thesis. Typically, piezoelectric loudspeakers possess a high quality factor Q and are characterized by sharp peaks near the resonance. However, the sharp resonant peaks limit the wider applicability of piezoelectric-based loudspeakers. We analyzed the relationship between all mode shapes of vibrating plate and sound pressure level instead of most design which only discussed rigid motion. According to Raleigh’s integral for sound radiation, not all the resonant modes of a vibrating plate can produce an effective sound pressure response in far field. One of the methods to get around this limitation is to excite multiple positions at the vibrating plate. In this thesis, we adopted a passive control to vary the vibrating behavior. In our setup, we used structural design to remove and to restrain certain mode shapes that could produce a much lower or higher sound pressure than the average. Furthermore, a combinative method for piezoelectric loudspeaker is brought up to improve the performance of piezoelectric loudspeaker. By choosing an effective structural design and appropriate combination by using Finite Element Method, we can obtain an ideal frequency response curve of the piezoelectric loudspeaker which can be flattened to satisfy the requirements for a loudspeaker. The applications of this high potential and miniaturizable piezoelectric loudspeaker can be extended through this improvement. | en |
dc.description.provenance | Made available in DSpace on 2021-06-14T16:50:11Z (GMT). No. of bitstreams: 1 ntu-97-R95525022-1.pdf: 5324482 bytes, checksum: 9a503466cc86fbffc8285ce6c4a54d15 (MD5) Previous issue date: 2008 | en |
dc.description.tableofcontents | 口試委員會審定書 i
謝誌 ii 中文摘要 iv ABSTRACT v CONTENTS vi LIST OF FIGURES ix LIST OF TABLES xiv Symbols xvi Chapter 1 Introduction 1 1.1 Motivation 1 1.2 Literature review 2 1.3 Research method 3 1.4 Thesis organization 4 Chapter 2 Theory 5 2.1 Piezoelectric: The basic properties of piezoelectricity 5 2.2 Plate vibration 9 2.3 Elastic plates with piezoelectric actuators 16 2.4 Acoustics 22 2.4.1 Far-field sound pressure of the vibrating plate 22 2.4.2 Decibel scales 24 Chapter 3 Experimental Setup and Instrumentation 25 3.1 Experimental setup 25 3.1.1 Production of piezoelectric vibrating plate 25 3.1.2 Observation of mode shape 26 3.1.3 Measurement of sound pressure response 27 3.2 Instrumentation 28 3.2.1 Instrument control software LabVIEW 28 3.2.2 DAQ NI-6251 30 3.2.3 Function generator GW- GFG-3015 31 3.2.4 Power amplifier NF- HSA4052 32 3.2.5 Standard microphone & condition amplifier 32 Chapter 4 Simulation and Experimental results 35 4.1 COMSOL model construction and analysis 35 4.2 Mode shapes and frequency response of piezoelectric loudspeaker 37 4.2.1 Reasons for the valleys of acoustic frequency response curve 37 4.2.2 Type of mode shapes for effective sound pressures 38 4.2.3 Verifying mode shapes for effective sound pressures in different dimension ratios of PZT to steel plate 41 4.2.4 Verifying mode shapes for effective sound pressures in different materials of vibrating plates 46 4.3 Using restrained bars to smooth the frequency response 60 4.3.1 Effects of different materials of restrained bars 65 4.3.2 Effects of different numbers of restrained bars 66 4.3.3 Effects of different materials of vibrating plates 74 4.3.4 Effects of different dimensions of vibrating plates 83 4.3.5 Effects of different boundary conditions 86 4.4 Array design of piezoelectric loudspeakers 88 4.4.1 Selection of each loudspeaker’s dimension 88 4.4.2 Improvement of array loudspeakers 90 Chapter 5 Conclusions and Future Work 93 REFERENCE 95 | |
dc.language.iso | en | |
dc.title | 以結構設計優化壓電式喇叭音頻響應的研發 | zh_TW |
dc.title | Optimizing Acoustic Frequency Response of Piezoelectric Loudspeakers Based on Structural Design | en |
dc.type | Thesis | |
dc.date.schoolyear | 96-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 吳文中,陳俊杉 | |
dc.subject.keyword | 壓電喇叭,模態,頻率響應,結構設計, | zh_TW |
dc.subject.keyword | piezoelectric loudspeaker,mode shape,frequency response,structural design, | en |
dc.relation.page | 96 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2008-07-31 | |
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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