Torsional waves propagation along a waveguide of arbitrary cross section immersed in a perfect fluid
Torsional waves propagation along a waveguide of arbitrary cross section immersed in a perfect fluid
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DOI：
10.1121/1.2968677
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发表时间：
2008-10-01
影响因子：
2.4
通讯作者：
Bacon, C.
中科院分区：
文献类型：
--
作者：
Fan, Z.;Lowe, M. J. S.;Bacon, C.
非圆截面杆中的扭转导波被用来测量流体的密度。然而，由于非圆形截面形状的波的行为的复杂性，以前的理论只能提供一个近似的预测，从而测量的准确性已经妥协。本文提出了一种半解析有限元法，精确地模拟了导波在任意非圆截面浸没波导中沿着传播的速度和泄漏。通过测量扭转波速的变化，提供了一个精确的反演模型来测量流体的密度。在一系列流体中使用矩形棒获得的实验结果与理论预测非常一致。最后讨论了该模型在传感器优化中的应用前景。(C)2008年，美国声学学会。[DOI 10.1121/1.2968677]
Guided torsional waves in a bar with a noncircular cross section have been exploited by previous researchers to measure the density of fluids. However, due to the complexity of the wave behavior in the noncircular cross-sectional shape, the previous theory can only provide an approximate prediction; thus the accuracy of the measurement has been compromised. In this paper, a semianalytical finite element method is developed to model accurately the propagation velocity and leakage of guided waves along an immersed waveguide with arbitrary noncircular cross section. An accurate inverse model is then provided to measure the density of the fluid by measuring the change of the torsional wave speed. Experimental results obtained with a rectangular bar in a range of fluids show very good agreement with the theoretical predictions. Finally, the potentials to use the model for sensor optimization are discussed. (C) 2008 Acoustical Society of America. [DOI: 10.1121/1.2968677]