Analysis of a straight tube Coriolis mass flowmeter

淡江大學機構典藏 > 工學院 > 航空太空工程學系暨研究所 > 學位論文 > Item 987654321/35562

請使用永久網址來引用或連結此文件: https://tkuir.lib.tku.edu.tw/dspace/handle/987654321/35562

題名:	Analysis of a straight tube Coriolis mass flowmeter
其他題名:	直型管科氏質量流率計之分析
作者:	吳季桓;Wu, Chi-huan
貢獻者:	淡江大學航空太空工程學系碩士班田豐;Tyan, Feng
關鍵詞:	科氏質量流計;有限元素法;Coriolis mass flowmeter;Finite Element Method
日期:	2007
上傳時間:	2010-01-11 06:46:55 (UTC+8)
摘要:	科氏流量計為一工業應用上相當精確的質量流量計, 其常被應用於測量飛行器燃油之消耗狀況.科氏流量計的數學模式可以藉由振動樑的理論來推導, 並以之分析管流的振動. 在流體為不可壓縮和非黏滯流的假設之下, 則該直管可視為是Timoshenko樑. 再藉由 Hamilton 的原理來推得控制方程式(governing equation). 為了更容易找出自然振動頻率, 本文將四個自由度的形狀函數(shape function)用三階多項式來表示, 再藉由Langrange 方程式推得樑的運動方程式. 由於經有此方式得到的運動方程式過於複雜, 因此本文採用有限元素法來求解運動方程式. 最後數值結果顯示ANSYS的mode shape很接近Matlab所求的, 也確認了相位差正比於質量流率. Coriolis mass flowmeter is an useful tool to measurement flowrate precisely, the purpose of the research is to analyze a Straight tube Coriolis mass flowmeter, it has been more than fifteen years since finite element method was implemented to the analysis of Coriolis flowmeter. The Coriolis mass flowmeter is modelled by using the theory of vibrating beams. We idealize the fluid as incompressible and inviscid, the tube is represented as Timoshenko beam. The governing equations were derived by Hamilton''s principle. In order to find out natural frequencies easily, we use a third order polynomial shape function for four degrees of freedom including two displacement and two slope and determine the weak form of equation of motion by Lagrange''s equation .The numerical results shows that the mode shape of Matlab is identical to ones of Ansys, and confirm the phase diffenence is proportional to the mass flowrate.
顯示於類別:	[航空太空工程學系暨研究所] 學位論文

文件中的檔案:

檔案	大小	格式	瀏覽次數
	0Kb	Unknown	808	檢視/開啟

在機構典藏中所有的資料項目都受到原著作權保護.

TAIR相關文章

資料載入中.....