(3.238.186.43) 您好!臺灣時間:2021/02/28 12:02
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果

詳目顯示:::

我願授權國圖
: 
twitterline
研究生:羅盛元
研究生(外文):Sheng-Yuan Lo
論文名稱:超音波導管應用於矩形槽之動態液位測量
論文名稱(外文):Ultrasonic Waveguide for Sloshing Liquid Level Measurement in Rectangular Tank
指導教授:宋家驥宋家驥引用關係
口試委員:黃翊鈞王昭男林益煌
口試日期:2019-07-17
學位類別:碩士
校院名稱:國立臺灣大學
系所名稱:工程科學及海洋工程學研究所
學門:工程學門
學類:綜合工程學類
論文種類:學術論文
論文出版年:2019
畢業學年度:107
語文別:中文
論文頁數:44
中文關鍵詞:超音波液位測量導管晃動
DOI:10.6342/NTU201903282
相關次數:
  • 被引用被引用:0
  • 點閱點閱:34
  • 評分評分:系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔系統版面圖檔
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:1
本研究選用氣體作為超音波傳聲介質,由於使用的換能器屬於自發自收式,超音波在傳遞時,彼此之間會互相干擾,以至於在收取信號時波包會互相重疊,造成誤判,在沒有回波放大電路下,很難清楚的接收到回波,故使用多個壓克力導管作為屏蔽,引導自發自收之換能器各自測量液位高度,同時利用機構上的改變,使回波能量放大,以至於可接收到回波信號。在液面靜止下,可藉由壓克力導管機構量測液面的傾斜角度反推當下的液面位置,且液面在線性的晃動下,也可透過液面晃動歷程,量測出平均液面高度,精度達到±2.2%以內,於低成本下,可達更精確、更穩定的量測結果,長時間運作與更廣泛的應用。
This study uses gas as the ultrasonic sound transmission medium. Since the transducers used is pulse-echo, the ultrasonic waves interfere with each other when they are transmitted. So that when the signal is received, the wave packets will overlap each other, causing misjudgment. It is difficult to clearly receive echoes without an echo amplifier circuit. Therefore, multiple acrylic tubes are used as shields to guide the self-receiving transducers to measure the liquid level. At the same time, the change of the mechanism is utilized to amplify the echo energy so that the echo signal can be received. When the liquid level is stationary, the current liquid level position can be reversed by measuring the inclination angle of the liquid surface by the acrylic tube mechanism. If the liquid level is under linear shaking, the average liquid level can be calculated through the sloshing process of the liquid surface. The longitude can reach ±0.5cm or less, and the measurement result can be more accurate and stable at low cost. Operates with a wider range of applications.
口試委員會審定書 #
誌謝 i
中文摘要 ii
ABSTRACT iii
CONTENTS iv
LIST OF FIGURES vi
LIST OF TABLES viii
Chapter 1 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 1
1.2.1 常見之液位量測技術 2
1.2.2 接觸式液位計 4
1.2.3 非接觸式液位計 6
1.2.4 量測技術比較 9
1.3 論文架構 10
Chapter 2 背景理論 11
2.1 超音波理論 11
2.1.1 超音波反射與折射 11
2.2 超音波換能器 12
2.2.1 超音波換能器運作形式 12
2.2.2 超音波換能器聲場 14
2.3 超音波於有限空間中傳遞 15
2.3.1 相速度與群速度 16
2.4 液體於二維矩形槽中晃動理論 17
2.4.1 控制方程式及邊界條件 17
Chapter 3 實驗架構與研究方法 20
3.1 實驗設備 20
3.2 靜態液面量測 27
3.2.1 靜態矩形槽實驗架構 27
3.2.2 液面傾斜及高度 27
3.3 動態液面量測 29
3.3.1 晃動之液面共振基本頻率 29
3.3.2 動態實驗架構 30
3.3.3 數據採集 31
Chapter 4 實驗結果與討論 35
4.1 靜態矩形水槽 35
4.1.1 傾斜角度實驗結果 35
4.2 動態矩形水槽 37
4.2.1 不同水深受相同頻率之量測結果 37
4.2.2 相同水深受不同頻率之量測結果 38
Chapter 5 結論及未來工作 41
5.1 結論 41
5.2 未來工作 42
REFERENCE 43
[1]A. Carullo and M. Parvis, "An ultrasonic sensor for distance measurement in automotive applications," IEEE Sensors Journal, vol. 1, no. 2, p. 143, 2001.
[2]J. F. Figueroa and J. S. Lamancusa, "A method for accurate detection of time of arrival: Analysis and design of an ultrasonic ranging system," The Journal of the Acoustical Society of America, vol. 91, no. 1, pp. 486-494, 1992.
[3]H. Hao-hao, X. Jun-qiao, "A method of liquid level measurement based on ultrasonic echo characteristics," IEEE Transactions on Sonics and Ultrasonics, vol. 11, pp. V11-682-V11-684, 2010.
[4]P. Li et al., "An accurate detection for dynamic liquid level based on MIMO ultrasonic transducer array," IEEE Transactions on Sonics and Ultrasonics, vol. 64, no. 3, pp. 582-595, 2014.
[5]B. Shan, J. Zijian, W. Tong and L. Haozhe, "Application of online SVR on the dynamic liquid level soft sensing," IEEE Transactions on Sonics and Ultrasonics, pp. 3003-3007, 2013.
[6]G. Qiu, Z. Luo and G. Zhou, "Discussion and design of dynamic liquid level intelligent monitoring system," International Journal of Smart Home, vol. 9, no. 11, pp. 211-224, 2015.
[7]B. Xu, L. Yu and V. Giurgiutiu, "Advanced methods for time-of-flight estimation with application to Lamb wave structural health monitoring," International Workshop on SHM, pp. 1202-1209, 2009.
[8]N. Suzuki, A. Osumi and Y. Ito, "Transmission of high-intensity aerial ultrasonic waves by using a straight rigid tube for sound wave transmission," IEEE International Ultrasonics Symposium, pp. 1-3, 2017.
[9]J. Terzic, C.R. Nagarajah and M. Alamgir, "Fluid level measurement in dynamic environments using a single ultrasonic sensor and Support Vector Machine (SVM)," Sensors and Actuators A: Physical, vol. 161, no. 1-2, pp. 278-287, 2010.
[10]Z. Hu, X. Zhang, X. Li and Y. Li, "On natural frequencies of liquid sloshing in 2-D tanks using Boundary Element Method," Ocean Engineering, vol. 153, pp. 88-103, 2018.
[11]V. Armenio and M. La Rocca, "On the analysis of sloshing of water in rectangular containers: numerical study and experimental validation," Ocean Engineering, vol. 23, no. 8, pp. 705-739, 1996.
[12]J. H. Jung, H. S. Yoon and C. Y. Lee, "Effect of natural frequency modes on sloshing phenomenon in a rectangular tank," International Journal of Naval Architecture and Ocean Engineering, vol. 7, no. 3, pp. 580-594, 2015.
[13]A. S. Morris and R. Langari, "Instrument Types and Performance Characteristics," Measurement and Instrumentation (Second Edition), A. S. Morris and R. Langari, Eds. Boston: Academic Press, pp. 13-44, 2016.
[14]L. K. Baxter, Capacitive sensors, 1997.
[15]A. S. Morris, R. Langari, "Level Measurement," Measurement and Instrumentation (Second Edition), A. S. Morris and R. Langari, Eds. Boston: Academic Press, pp. 531-545, 2016.
[16]吳朗, 電子陶瓷: 壓電陶瓷, 全欣, 1994.
[17]L. E. Kinsler, A. R. Frey and A. B. Coppens. Fundamentals of acoustics, p. 560, 1999.
[18]冯若, 超声手册, ed: 南京: 南京大学出版社, 1999.
[19]A. H. Fitch, "Observation of Elastic‐Pulse Propagation in Axially Symmetric and Nonaxially Symmetric Longitudinal Modes of Hollow Cylinders," The Journal of the Acoustical Society of America, vol. 35, no. 5, pp. 706-708, 1963.
[20]J. L. Rose, Ultrasonic waves in solid media. Cambridge university press, 2004.
[21]葛家豪, 液體與結構互制作用理論及其在液體儲存槽及諧調液體阻尼器之應用硏究, 臺灣大學工程科學與海洋工程系博士學位論文, 2003.
[22]I. G. Currie and I. Currie, Fundamental mechanics of fluids. Crc Press, 2002.
[23]李萬源, 三維矩形槽內液體之振盪研究, 國立海洋大學造船工程學系碩士學位論文, 1994.
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top
系統版面圖檔 系統版面圖檔