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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳俊杉(Chuin-Shan Chen) | |
dc.contributor.author | Nien-Ti Tsou | en |
dc.contributor.author | 鄒年棣 | zh_TW |
dc.date.accessioned | 2021-06-13T04:33:14Z | - |
dc.date.available | 2008-07-25 | |
dc.date.copyright | 2006-07-25 | |
dc.date.issued | 2006 | |
dc.date.submitted | 2006-07-19 | |
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(2001), Dynamics of structures: theory and applications to earthquake engineering, 2nd Ed., Prentice Hall, New York. Clarke, R. L. (1995), “Modification of intensity distributions from large aperture ultrasound sources,” Ultrasound Med. Biol., vol. 21, no. 3, pp.353-363. Damle, R. V. (1994), “New criterion for measurement of stiffness constants c44, c55, c66, and c33 of lithium niobate and quartz,” J. Phys. D: Appl. Phys., 27, 1933-1937. Fry, F. J., N. T. Sanghvi, R. F. Morris, S. Smithson, L. Atkinson, K. Dines, T. D. Franklin, and J. Hasting (1986), ”A focused ultrasound system for tissue volume ablation in deep seated brain sites,” in IEEE Ultrasonics Symp., pp. 1001-1004. Gill, P. E., W. Murrary, and M. H. Wright, M. H (1991). Numerical Linear Algebra and Optimization, vol. 1, Addison-Wesley, Redwood City, California. González, A. M., and C. Alemany (1996), “Determination of the frequency dependence of characteristic constants in lossy poezoelectric materials,” J. Phys. D: Appl. Phys., 29, 2476-2482. Gounaris, G. D. and N. K. Anifantis (1999), “Structural damping determination by finite element approach,” Comput. Struct., 73[1-5], 445-452. Gresham, I., A. Jenkins, R. Egri, C. Eswarappa, N. Kinayman, N. Jain, R. Anderson, F. Kolak, R. Wohlert, S. P. Bawell, J. Bennett, J.-P. Lanteri (2004), “Ultra-wideband radar sensors for short-range vehicular applications,” IEEE Trans. On Microwave Theory and Techniques, 52 (9), pp. 2105-2122. Guo, N., P. Cawley, and D. Hitchings (1992), “The finite element analysis of the vibration characteristics of piezoelectric discs,” J. Sound Vib., 159[1], 115-138. Häerdtl, K. H. (1982), “Electrical and mechanical losses in ferroelectric ceramics,” Ceram. Int., 8[4], 121-127. Hill, C. R. (1994), “Optimum acoustic frequency for focused ultrasound surgery,” Ultrasound Med. Biol., vol. 20, no. 3, pp.271-277. Holland, R. (1967), “Representation of dielectric, elastic, and piezoelectric losses by complex coefficients,” IEEE Trans. Sonics Ultrason, [14], 18-20. “IEEE Standard on Piezoelectricity,” ANSI/IEEE Standard 176-1987 (1987), American National Standards Institute/Institute of Electrical and Electronics Engineers, New York. Kelly, J., A. Ballato, and A. Safari (1996), “Characterization of loss mechanisms in piezoelectric ceramic microresonators,” IEEE Ultrasonics Symposium, 539-542. Kinsler, E. L. et. Al (1982)., Fundamentals of Acoustics, John Wiley and Sons, New York pp. 98-123. Lerch, R. (1990), “Simulation of piezoelectric devices by two- and three-dimensional finite elements,” IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 37[2], 233-247. Lethiecq, M., L. P. Tran-Huu-Hue, P. Frederick, and L. Pourcelot, L. (1993), “Measurement of losses in five piezoelectric ceramics between 2 and 50 MHz,” IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 40[3], 232-237. Li, Shih-Hsiung (2002), US6370086, United States Patent. Matsuo, Kenji, Kanazawa, Junshi Ota, Ishikawa-gun, (2006), US7009326, United States Patent. NITS (2002), National Intelligent Transportation Systems Program Plan: A Ten-Year Vision by the Intelligent Transportation Society of America. Norton, M. P., and R. Greenhalgh, R (1986). “On the estimation of loss factors in lightly damped pipeline systems: some measurement techniques and their limitations,” J. Sound Vib., 105[3], 397-423. Rapps, P., Karlsruhe, Peter Knoll, Ettlingen, Franz Pachner et al. (1995), US5446332, United States Patent. Rivens, I. H., R. L. Clarke, and Grail R. ter Haar (1996). ”Design of focused ultrasound surgery transducers.” IEEE Trans. Ultrason. Ferroelectr. Freq. Control, vol. 43, no. 6. Sasaki, Y., S. Takahashi, and S. Hirose (1997), “Relationship between mechanical loss and phases of physical constants in Lead-Zirconate-Titanate ceramics,” Jpn. J. Appl. Phys., Part 1, 36[9B], 6058-6061. Seip, R., W. Chen, J. Tavakkoli, L. A. Frizzell, and N. T. Sanghvi. (2003).“High-intensity focused ultrasound phased arrays: recent developments in transrectal transducers and driving electronic design” Proc. 3th International Symposium on Therapeutic Utrasound. Sherrit, S., and B. K. Mukherjee (1998), “The use of complex material constants to model the dynamic response of piezoelectric materials,” Proceedings of the IEEE Ultrasonics Symposium, 1, pp. 633-640. Tran-Huu-Hue, L. P., F. Levassort, N. Felix, D. Damjanovic, W. Wolny, and M. Lethiecq (2000), “Comparison of several methods to characterize the high frequency behaviour of piezoelectric ceramics for transducer applications,” Ultrasonics, 38, 219-223. Uchino, K., and S. Hirose (2001), “Loss mechanisms in piezielectrics: how to measure different losses separately,” IEEE Trans. Ultrason. Ferroelectr. Freq. Control, 48[1], 307-321. 池田拓郎(1985),陳世春譯。基本壓力材料學,復漢出版社。 鄭世裕(1999),壓電陶瓷,陶瓷技術手冊,汪建明主編,修訂版,全華科技圖書股份有限公司,台灣。 欒桂冬,張金鋒與王仁乾編著(1990),壓電換能器和換能器陣,修訂版,北京大學出版社。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/33294 | - |
dc.description.abstract | 本論文透過有限元素法對壓電元件進行模擬與設計分析。主要應用於三方面:壓電元件的導納模擬、距離感測器指向性模擬與醫用高功率燒灼器模擬。
在壓電元件的導納模擬方面,本論文提出一個新的方法以有限元素法來模擬壓電元件的機械能量耗損。其中機械能量耗損可藉由迭代法所求出之複數材料參數被考慮進壓電元件中。並利用QR分解法將欲求之任意形狀元件的能量耗損分析成9種基本模態。且因為這些基本模態的能量耗損因子已知,故可將其轉換成總體等效黏滯阻尼比,如此即可直接被一般的有限元素動力分析考慮進模擬系統中。本文並利用實驗與理論公式驗證此數值方法之結果,證實此方法的確可提供準確的機械能量損失因子,並模擬出相當精準的導納頻率響應曲線。 在距離感測器指向性模擬方面,本文針對感測器發波面的結構邊界條件對音波半衰角的影響進行分析。一般車用距離感測器的要求為垂直面半衰角小,水平面半衰角大的不對稱指向特性。由結果可知發波面邊界條件類似為固定端的狀況下半衰角最大;鉸支承次之;自由端半衰角最小。利用以上結果,本文將市售距離感測元件的垂直方向外殼挖洞,使發波面結構邊界條件更類似於一個自由端,由模擬結果看來,此舉可使元件指向性的不對稱約增加50%。但邊界條件過度趨近於自由端,卻會使音波能量降低,減少感測距離。為了顧及感測範圍。本文進一步透過改變洞長參數,求得最佳洞長約為0.4倍之元件直徑。 在醫用高功率燒灼器模擬方面。一般醫用燒灼器的需求為-3dB壓力值所圍的面積長寬比必須大,因此本文建製燒灼器元件之模型,瞭解其振動模態與共振頻率,再以實驗證實數值模擬的正確性。並進一步針對相同元件面積下,探討改變曲率半徑及張角對於燒灼面積的影響。由結果得知,曲率半徑愈小張角愈大會導致燒灼面積減小、長寬比增加以及壓力主峰值的提高。 本論文成功地透過有限元素法精準模擬壓電元件的能量耗損,並找出距離感測元件設計最佳解,以及預測醫療燒灼器幾何變化所造成的影響。不僅如此,研究中模擬的結果能在壓電元件實作之前,即提供一定程度的分析與預測能力。在未來研究中更可進一步探討壓電片在元件中的配置與效率間的關係,以及超音波在不同介質中傳遞的行為,拓展模擬輔助設計之功能性。 | zh_TW |
dc.description.abstract | In this thesis, we analyze and design the piezoelectric device by finite element simulation. The modeling and simulation have been applied in three subjects: admittance of piezoelectric device, directivity of distance sensor, and high intensity focused ultrasound( HIFU).
For admittance of piezoelectric device, a methodology to model mechanical losses of piezoelectric devices by the finite element analysis is presented. Complex parts of the material constants are extracted using an iterative method. Mechanical losses of piezoelectric devices are taken into account through these complex constants. A scheme using the QR factorization is developed to decompose mechanical losses of an arbitrary-shaped device into fundamental modes. These losses are then transformed into an equivalent viscous damping ratio in a standard finite element dynamics analysis. The proposed method enables us to obtain a reliable mechanical loss factor. Numerical results demonstrate that the proposed method can predict measured admittance spectra reasonably well. For directivity of distance sensor, we analyze the effect of different boundary conditions to the half decay angle. The goal for vehicle short-range sensing is that the half decay angle in the vertical direction has to be less than that in horizontal. Our simulation reveals that the half decay angle of free end boundary condition is much less than that of simple-supported and fixed ends. With such design criterion in mind, we further improve the distance sensor device by cutting a square hole in the vertical direction to mimic the free-end boundary condition. This procedure can improve the asymmetry of directivity up to 50%. However, it shortens the detect region. Therefore, we change the length of cave and obtain an optimized value, 0.4 times of device diameter, for the directivity and detect region. The HIFU application requires the length to width ratio of -3dB focal area to reach a maximum value. To this end, we construct the HIFU simulation model to find out the relations between the modal shape and resonance frequency, and compare the numerical result with experimental measurements. Furthermore, we change geometric focal length and angle in the same active area to explore the effect of -3dB focal area. The result reveals that small geometric focal length and large angle may decrease the -3dB focal area, and increase length to width ratio and the pressure magnitude of main lobe. In conclusion, we have successfully shown the feasibility of using finite element simulation to analyze the behavior of piezoelectric devices. Through the aforementioned simulation, we can predict the energy loss of piezoelectric material and provide a guideline for design of distance sensor and HIFU. | en |
dc.description.provenance | Made available in DSpace on 2021-06-13T04:33:14Z (GMT). No. of bitstreams: 1 ntu-95-R93521604-1.pdf: 3474186 bytes, checksum: 39fed8f58e94bc90b0e9ac35c8f6b559 (MD5) Previous issue date: 2006 | en |
dc.description.tableofcontents | 致謝 i
摘要 v Abstract vii 目錄 ix 圖目錄 xiii 表目錄 xvii 第1章 緒論 1 1-1 簡介 1 1-2 研究目的 4 1-3 論文架構 5 第2章 壓電材料行為與量測 6 2-1 壓電效應 6 2-2 壓電材料簡介 7 2-3 壓電方程式 9 2-4 複數壓電材料係數量測方法 12 2-5 壓電有限元素理論 20 2-5-1 壓電元件之有限元素理論 20 2-5-2 壓電元件模態分析 23 2-5-3 壓電元件頻率域分析 27 第3章 壓電元件導納量測與模擬 30 3-1 研究背景 30 3-2 壓電材料之能量損失因子 32 3-3 任意形狀元件之能量損失因子 35 3-4 考慮能量損失之導納模擬 41 3-4-1 具有導納解析式之標準形狀 42 3-4-2 無導納解析式之形狀 48 3-5 結果討論 51 第4章 壓電元件應用於車用超音波距離感測器 52 4-1 研究背景 52 4-2 壓電元件指向性模擬相關理論 54 4-2-1 波傳理論 55 4-2-2 有限元素應用於流體與結構之耦合計算 57 4-2-3 超音波元件指向性與半衰角 59 4-3 超音波距離感測器量測與模擬 60 4-3-1 壓電元件指向性量測實驗 60 4-3-2 距離感測器與波傳系統模型建置與模擬 61 4-3-3 量測與模擬結果驗證討論 65 4-4 壓電元件設計與指向性分析 69 4-4-1 結構邊界條件與半衰角之關係 69 4-4-2 壓電元件設計改進與模擬 72 4-4-3 元件設計討論 76 4-5 結論 79 第5章 壓電元件應用於醫用高功率燒灼器 81 5-1 研究背景 81 5-2 醫用高功率燒灼器量測與模擬 82 5-2-1 燒灼器壓力量測實驗 82 5-2-2 燒灼器壓力模擬模型建製與模擬 84 5-2-3 量測與模擬結果驗證討論 88 5-3 定表面積下曲率半徑及張角之影響討論 89 5-4 結論 95 第6章 結論 96 6-1 研究成果與貢獻 96 6-2 未來研究方向 98 參考文獻 100 附錄一 105 附錄二 109 附錄三 113 作者簡歷 115 | |
dc.language.iso | zh-TW | |
dc.title | 應用有限元素法模擬壓電元件與超音波波傳 | zh_TW |
dc.title | Simulation of Piezoelectric Device and Ultrasonic Wave using Finite Element Analysis | en |
dc.type | Thesis | |
dc.date.schoolyear | 94-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 馬劍清(Chien-Ching Ma),謝宗霖(Tzong-Lin Shieh),吳文中 | |
dc.subject.keyword | 壓電,有限元素分析,能量損失因子,感測器,燒灼器, | zh_TW |
dc.subject.keyword | piezoelectricity,finite element analysis,loss factor,sensor,HIFU, | en |
dc.relation.page | 114 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2006-07-20 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 土木工程學研究所 | zh_TW |
顯示於系所單位: | 土木工程學系 |
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