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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 王昭男(Chao-Nan Wang) | |
dc.contributor.author | Che-Hung Lee | en |
dc.contributor.author | 李哲宏 | zh_TW |
dc.date.accessioned | 2021-06-15T14:02:08Z | - |
dc.date.available | 2023-04-07 | |
dc.date.copyright | 2020-08-20 | |
dc.date.issued | 2020 | |
dc.date.submitted | 2020-08-11 | |
dc.identifier.citation | [1] Christensen, Ove and Bo B. Vistisen, 'Simple model for low-frequency guitar function', The Journal of the Acoustical Society of America, 68(3), 758-766, 1980. [2] Firth, I. M., 'Physics of the guitar at the helmholtz and first top-plate resonances', The Journal of the Acoustical Society of America, 61, 1976. [3] Popp, John E, 'Four mass coupled oscillator guitar model', Acoustical Society of America, 131, 829, 2012. [4] Sumi, Takeshi and Teruaki Ono, 'Classical guitar top board design by finite element method modal analysis based on acoustic measurements of guitars of different quality', The Acoustical Society of Japan, 29, 6, 2008. [5] Gorrostieta-Hurtado, E., et al., 'Vibration analysis in the design and construction of an acoustic guitar', International Journal of Physical Sciences, 7(13), 1986-1997, 2012. [6] Castaldo, G., “Experimental analysis and fem simulation of vibrating plates and acoustic guitar soundboard”, Mechanical Engineering, Politecnico Di Torino, Master Thesis, 2018. [7] Inta, R., “The acoustics of the steel string guitar”, School of Physics, University of New South Wales Sydney, Australia, Doctor Thesis, 2007. [8] Abaeian, N., 'Finite Element Design and Manufacturing of a Nylon-String Guitar Soundboard from Sandwich-Structured Composites”, McGill University Montreal Department of Music Research Master’s Thesis, Canada, 2017. [9] M. J. Elejabarrieta, A. Ezcurra, and C. Santamaria, “Coupled modes of the resonance box of the guitar”, The Journal of the Acoustical Society of America, Vol. 111, 2283-2292, 2002. [10] Torres, J. A. and R. R. Boullosa. 'Influence of the bridge on the vibrations of the top plate of a classical guitar', Applied Acoustics 70, 2009. [11] Ono, T., 'Frequency responses of wood for musical instruments in relation to the vibrational properties', The Journal of the Acoustical Society of Japan, 17, 4, 1996. [12] Kretschmann, David E, 'Mechanical Properties of Wood', General Technical Report FPL-GTR-190, 1999. [13] S. Hurlebaus, 'Nondestructive evaluation of composite laminates', the Journal of Nondestructive Testing Ultrasonics Testing, 4, 3, 1999. [14] 卓志隆、葉小雲 (2006),'低分子量酚甲醛樹脂處理對雲杉平板振動性質之影響',林產工業,25,2006。 [15] ASTM international, 'Standard test method for dynamic young’s modulus, shear modulus, and poisson’s ratio by impulse excitation of vibration', ASTM E 1876, 2007. [16] Lucas Barcelos Otani, et al, 'Elastic moduli characterization of wood and wood products using the impulse excitation technique', ATCP Physical Engineering, 2017. [17] N. H. Fletcher and T. D. Rossing, “The physic of musical instruments”, 2nd ed., New York: Springer Science, 1998. [18] Lee, C.H., “Measuring guitar soundboards material parameters by impulse excitation technique”, Proceedings of the 32nd annual meeting of Taiwan Acoustical Association, Taipei, Taiwan, 2019. [19] Mamou-Mani, A., “Pre-stress effects on the eigenfrequencies of the soundboards: Experimental results on a simplified string instrument”, The Journal of the Acoustical Society of America, 131, 872, 2012. [20] Dumond, P. and Baddour N., “A structured method for the design-for-frequency of a brace-soundboard system using a scalloped brace”. Applied Acoustics, 88, 96, 2015. [21] Bretos, J., Santamaria, C. and Moral, J. A., 'Vibrational patterns and frequency responses of the free plate and box of a violin obtained by finite element analysis', The Journal of the Acoustical Society of America, Vol. 105, No. 3, pp. 1942-1950, 1999. [22] Wright, H., “The acoustic and psychoacoustic of the guitar”, Department of Physics and Astronomy, University of Wales, College of Cardiff, Doctor Thesis, 1996. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/51998 | - |
dc.description.abstract | 本研究針對吉他面板設計三階段的實驗量測模擬,以了解吉他面板之振動與聲學特性。首先,本文以脈衝激振量測法結合有限元素法計算材料楊氏係數與剪力模數,俾利後續吉他建構模擬等相關使用。接著,本研究以有限元素法建構吉他面板模型,利用模態分析、預應力分析與簡諧響應分析等模擬方式,探討吉他力木結構、腔體大小等面板結構改變對吉他振動與聲學性質之影響。最後,本研究設計實驗量測吉他面板模型之頻率響應,並與前模擬結果趨勢進行比較及討論。 面板為吉他之主要發聲部位,故其之於吉他聲學特性影響顯著。然而吉他面板因其多變之材料性質、面板形狀與力木分布型態,增加面板振動特性之複雜與困難度。此特殊結構設計使有限元素模擬分析成為適合預測面板特性之方法,得以輔助吉他面板結構設計提升效率,亦減少實體測試之時間及成本。 本研究分析發現,不同吉他面板結構改變將對面板振動特性造成不同方式與程度之變化。力木X-brace切削將使低階模態下降,增進吉他之低頻響應;而Tone-brace切削之影響則集中於吉他較高頻率範圍。力木過量的切削,具有大幅減少面板結構強度之趨勢,然而亦有特殊切削組合將減少應力集中進而增進面板結構穩定性之情況,值得深入探討。最後,將面板組裝於吉他後腔體後,腔體耦合空氣將使吉他產生共振增進低頻,不同腔體大小亦對其共振與吉他低階特徵模態頻率造成不同程度影響。結合上述不同現象表徵,本文將提供吉他製琴時較明確之方向,達到輔助吉他調音過程之效果。 | zh_TW |
dc.description.abstract | The study design three different simulations and experiments to understand the vibrational and acoustical properties of a guitar soundboard. First, the study presents a method using IMT (Impulse Excitation Technique) and FEM (Finite Element Method) to estimate Young's modulus and Shear modulus of wooden material for the guitar soundboard, and the results would employ in further analytical investigations for guitar construction. Next, the study shows a numerical method utilizing FEM to predict acoustic guitar characteristics through model analysis, structural analysis, and frequency response. By modifies the structure design of guitar bracing and body's volume, the study understands how will different soundboard structures influence the guitar soundboard acoustical characteristic. Last, the study designs an experiment to measure the frequency response of a real guitar soundboard model and compares the measurements with previous simulation results. As the primary sounding section of a guitar, soundboard considerably influences guitars acoustic feature. However, the variation among its materials, shapes, and bracing patterns increases the complexity to have a clear understanding of the instrument. The complex designed structure makes FEM be a perfect way to predict the behavior of the soundboard, which will help the soundboard designing process more efficient and reduce the time and cost for experiments. The research discovered that different kinds of structural modifications affect the soundboard vibrational behavior in various ways. X-brace scalloping decreases the frequencies of lower modes, which benefits the lower frequency range response, and tone-brace scalloping is quite the opposite that mainly influences the higher frequency response range. However, overly scallops the guitar bracing may reduce the structural durability of the soundboard, though the study still found some particular cases which will increase the structural stability by spreading the stress more evenly, which is worth the efforts for further studies. Last, joining the side and back to the soundboard of the guitar will not only produce new air resonance to improve low-frequency response but also affect the lower mode frequencies in different degrees depends on its size. This study expects to provide a clearer designing dereliction for guitar making and tuning by employing these discoveries. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T14:02:08Z (GMT). No. of bitstreams: 1 U0001-0708202016584600.pdf: 9439156 bytes, checksum: aab35e5bb3436605dddbde723effdd6c (MD5) Previous issue date: 2020 | en |
dc.description.tableofcontents | 致謝 I 摘要 II Abstract III 目錄 IV 圖目錄 VII 表目錄 第一章 緒論 1 1.1 研究動機與目的 1 1.2 文獻回顧 2 1.3 論文架構 3 第二章 理論分析與實驗方法 4 2.1吉他物理學簡介 4 2.1.1吉他之構造 5 2.1.2吉他之振動與發聲原理 5 2.2面板材料特性及量測 10 2.2.1木材性質與結構 10 2.2.2彈性材料參數 11 2.2.3脈衝激振量測法 13 2.3有限元素法 15 2.3.1模態分析 15 2.3.2預應力分析 16 2.3.3簡諧響應分析 16 第三章 有限元素模擬建立與實驗架構 17 3.1實驗設備及校正 17 3.1.1全無響室 17 3.1.2 PCB麥克風與放大器 18 3.1.3衝擊鎚 18 3.1.4 NI信號擷取裝置 19 3.1.5麥克風校正 19 3.2材料參數量測實驗 20 3.2.1脈衝激振量測法 21 3.2.2有限元素迭代反算法 23 3.3吉他琴體模型建構與模擬 26 3.3.1面板與力木模型 26 3.3.2琴橋模型 30 3.3.3腔體模型 31 3.3.3材料參數與座標設定 32 3.3.5實驗模擬之邊界條件 34 3.4吉他面板量測實驗 37 3.4.1面板模型建構 37 3.4.1吉他面板頻率響應量測實驗 41 第四章 實驗數據與模擬結果 43 4.1材料參數量測數據與結果 43 4.1.1特徵頻率量測 43 4.1.2材料參數計算 44 4.2吉他面板模擬結果 46 4.2.1特徵頻率與模態 47 4.2.2預應力分析 58 4.2.3頻率響應 63 4.3吉吉他面板實驗量測結果 68 4.3.1特徵模態 68 4.3.2頻率響應實驗與模擬值比較 70 4.3.3力木切削對頻率響應之影響 72 4.3.4誤差討論 74 第五章 結論 76 5.1結論 76 5.2未來展望 78 參考文獻 79 | |
dc.language.iso | zh-TW | |
dc.title | 吉他面板之建構與模擬 | zh_TW |
dc.title | Constructions and simulations of acoustic guitar soundboard | en |
dc.type | Thesis | |
dc.date.schoolyear | 108-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 謝傳璋(Chuan-Zhang Xie),湯耀期(Yao-Chi Tang),宋家驥(Chia-Chi Sung) | |
dc.subject.keyword | 吉他面板,力木切削,有限元素法,模態分析,結構設計分析, | zh_TW |
dc.subject.keyword | guitar soundboard,brace scalloping,finite element simulations,model analysis,structural design analysis, | en |
dc.relation.page | 82 | |
dc.identifier.doi | 10.6342/NTU202002655 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2020-08-11 | |
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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