管道液体流速对超声导波纵向模态传播的影响分析  

Analysis of the influence of liquid velocity in pipeline on ultrasonic guided wave longitudinal mode propagation

作　　者：刘增华[1] 宋振华 张易农 吴斌[1] 何存富[1] LIU Zeng-hua1 , SONG Zhen-hua1 , ZHANG Yi-nong2 , WU Bin1 , HE Cun-fu1(1. College of Mechanical Engineering and Applied Electronics Technology, Beijing University of Technology, Beijing 100124, China; 2. The Measurement Test Research Institute of Beijing, Beijing 100029, Chin)

机构地区：[1]北京工业大学机械工程与应用电子技术学院,北京100124 [2]北京市计量检测科学研究院,北京100029

出　　处：《实验力学》2018年第1期1-7,共7页Journal of Experimental Mechanics

基　　金：国家自然科学基金项目(51475012,11272021,11772014);北京市属高等学校高层次人才引进与培养计划项目(CIT&TCD201304048)

摘　　要：建立了充液管道中液体流动时超声导波纵向模态的群速度频散方程,研究了模态、激励频率对载流管道内超声导波传播的影响。在数值仿真的基础上,利用环形压电阵列在载流管道中激励接收频率305kHz的L（0,5）模态,对纵向模态在载流管道中的传播特性进行了实验研究。研究结果表明,载流管道内频率305kHz的L（0,5）模态的群速度与液体流速呈近似线性变化。实验结果与理论分析结果相符,该结论为载流管道流量在线测量提供了一种新方法,为超声导波流量计的研制打下了理论基础。In this paper,agroup velocity dispersion equation of ultrasonic guided wave longitudinal mode in liquid filled pipeline is established.The influence of mode and excitation frequency on propagation of ultrasonic guided wave in current carrying pipe was studied.Based on numerical simulation,L（0,5）mode excited by the circular piezoelectric array in current carrying pipeline was adopted to stimulate the received frequency 305 kHz.The propagation characteristics of longitudinal modes in the current carrying pipeline were experimentally investigated.Experimental results indicate that group velocity of the L（0,5）mode of 305 kHz frequency in current carrying pipe exhibits approximately linear variation with the flow velocity of liquid.Experimental results are in good agreement with theoretical analysis. This conclusion may provide a new method for on-line measurement of current carrying pipe flow,and lay a theoretical foundation for development of ultrasonic guided wave flowmeter.

关 键 词：纵向模态 载流管道 频散曲线 传播时间 流量测量 

分 类 号：TN249[电子电信—物理电子学] TB553[理学—物理]