| 非浸入式超声导波液位测量方法研究 |
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| 引用本文： | 徐鸿,郭鹏,田振华,邓博,张凯利.非浸入式超声导波液位测量方法研究[J].仪器仪表学报,2017,38(5):1150-1158. |
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| 作者姓名： | 徐鸿 郭鹏 田振华 邓博 张凯利 |
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| 作者单位： | 华北电力大学能源动力与机械工程学院北京102206,华北电力大学能源动力与机械工程学院北京102206,华北电力大学能源动力与机械工程学院北京102206,华北电力大学能源动力与机械工程学院北京102206,华北电力大学能源动力与机械工程学院北京102206 |
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| 基金项目： | 国家自然科学基金（51134016，11074073）、中央高校基本科研业务费专项资金（2016XS25）项目资助 |
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| 摘 要： | 从Navier运动方程出发,求解了自由平板和覆水平板中导波的特征方程,并绘制了其频散曲线。自由平板和覆水平板频散特性对比分析后,发现了覆水平板中导波模态较自由平板多了一种Quasi-Scholte模态导波。通过数值计算、有限元模拟和实验研究,分别对自由平板和覆水平板中导波的传播特性和模态进行验证。在低频区,A_0模态导波存在于自由平板中,而Quasi-Scholte模态导波只存在于覆水平板中。利用Quasi-Scholte模态和A_0模态导波的传播特性设计液位测量实验,采用一激一收压电传感器布置方式,频率130 k Hz的2.5周期汉宁窗调制正弦波作为检测信号,结果表明,液位与导波传播时间呈线性关系,能够用于容器内液位测量。
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| 关 键 词： | 超声导波 A0模态 Quasi Scholte模态 液位测量 |
Research on non immersive water level measurement method based on ultrasonic guided waves |
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| Xu Hong,Guo Peng,Tian Zhenhu,Deng Bo and Zhang Kaili.Research on non immersive water level measurement method based on ultrasonic guided waves[J].Chinese Journal of Scientific Instrument,2017,38(5):1150-1158. |
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| Authors: | Xu Hong Guo Peng Tian Zhenhu Deng Bo and Zhang Kaili |
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| Affiliation: | School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206,China,School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206,China,School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206,China,School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206,China and School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206,China |
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| Abstract: | The characteristic equations of the guided waves in free steel plate and water loaded steel plate are solved based on the Navier kinetic equation; then, the dispersion curves are drawn. After comparing and analyzing the dispersion characteristics of free plate and water loaded plate, it is found that a Quasi Scholte modal guided wave exists in water loaded steel plate, which does not exist in free steel plate. Through numerical calculation, finite element simulation and experiment, the propagation characteristics and modals of the guided waves in free plate and water loaded plate are verified respectively. In low frequency region, A0 modal exists in the guided waves in free plate, and Quasi Scholte modal only exists in the guided waves in water loaded plate. Using the propagation characteristics of the A0 modal and Quasi Scholte modal guided waves, a water level measurement experiment was designed, which adopts pitch catch PZT sensor deployment modal, and a 130Hz, 2.5 period Hanning window modulated sine wave signal is used as the test signal. The results show that the water level and the guided wave propagation time exhibit a linear relationship, which can be potentially used for the estimation of water level in a container. |
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| Keywords: | ultrasonic guided wave A0 modal Quasi Scholte modal water level measurement |
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