充液管道纵向导波在黏度测量中的应用研究
发布时间：2018-08-11 19:32
【摘要】：利用COMSOL仿真和实验,研究并证实了充液管道纵向导波测量液体黏度的可行性.有限元仿真采用声固耦合模块、特征值求解器来获得导波实波数、复频率和波结构,以及不同模态的位移和声压分布.实波数和频率实部构成群速度频散曲线,频率虚部和频率实部构成衰减频散曲线.计算和测试了不同充液属性时纵向导波的群速度和衰减频散曲线.黏度不影响导波群速度频散曲线,黏度增加时,衰减系数增大;密度增加时,导波群速度和频散区的衰减均变小,而非频散区的衰减不变;纵波速度增加时,群速度和衰减频散曲线均右移.
[Abstract]:The feasibility of liquid viscosity measurement by longitudinal guided wave in liquid-filled pipeline is studied and verified by COMSOL simulation and experiment. In the finite element simulation, acoustic coupling module and eigenvalue solver are used to obtain the real wave number, complex frequency and structure of guided wave, as well as the displacement and sound pressure distribution of different modes. The real wave number and the real part of the frequency constitute the dispersion curve of group velocity, and the imaginary part of frequency and the real part of frequency constitute the attenuation dispersion curve. The group velocities and attenuation dispersion curves of longitudinal guided waves with different liquid filling properties were calculated and measured. Viscosity does not affect the dispersion curve of guided wave group velocity. When viscosity increases, the attenuation coefficient increases. When density increases, the attenuation of guided wave group velocity and dispersion region becomes smaller, but the attenuation in non-dispersive region is not changed, and when the longitudinal wave velocity increases, the attenuation of guided wave group velocity and dispersion region becomes smaller. Both the group velocity and the attenuation dispersion curve are shifted to the right.
【作者单位】： 天津大学精密测试技术及仪器国家重点实验室;
【基金】：国家重大科学仪器设备开发专项资助项目(2013YQ03091503) 国家自然科学基金资助项目(51604192)~~
【分类号】：TE938
本文编号：2178024
[Abstract]:The feasibility of liquid viscosity measurement by longitudinal guided wave in liquid-filled pipeline is studied and verified by COMSOL simulation and experiment. In the finite element simulation, acoustic coupling module and eigenvalue solver are used to obtain the real wave number, complex frequency and structure of guided wave, as well as the displacement and sound pressure distribution of different modes. The real wave number and the real part of the frequency constitute the dispersion curve of group velocity, and the imaginary part of frequency and the real part of frequency constitute the attenuation dispersion curve. The group velocities and attenuation dispersion curves of longitudinal guided waves with different liquid filling properties were calculated and measured. Viscosity does not affect the dispersion curve of guided wave group velocity. When viscosity increases, the attenuation coefficient increases. When density increases, the attenuation of guided wave group velocity and dispersion region becomes smaller, but the attenuation in non-dispersive region is not changed, and when the longitudinal wave velocity increases, the attenuation of guided wave group velocity and dispersion region becomes smaller. Both the group velocity and the attenuation dispersion curve are shifted to the right.
【作者单位】： 天津大学精密测试技术及仪器国家重点实验室;
【基金】：国家重大科学仪器设备开发专项资助项目(2013YQ03091503) 国家自然科学基金资助项目(51604192)~~
【分类号】：TE938
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