刘增华*,宋振华,张易农,吴斌,何存富.管道液体流速对超声导波纵向模态传播的影响分析[J].实验力学,2018,33(1):1~7 |
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 |
投稿时间:2017-02-05 修订日期:2017-03-29 |
DOI:10.7520/1001-4888-17-018 |
中文关键词: 纵向模态 载流管道 频散曲线 传播时间 流量测量 |
英文关键词:longitudinal mode current carrying pipeline dispersion curve propagation time flow measurement |
基金项目:国家自然科学基金项目(51475012, 11272021, 11772014)和北京市属高等学校高层次人才引进与培养计划项目(CIT&TCD201304048) |
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中文摘要: |
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。 |
英文摘要: |
In this paper, a group 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 305kHz. 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 305kHz 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. |
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