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何存富 孙雅欣 吴斌 王秀彦 刘增华. 高频纵向导波在钢杆中传播特性的研究[J]. 力学学报, 2007, 23(4): 538-543. DOI: 10.6052/0459-1879-2007-4-2006-271
引用本文: 何存富 孙雅欣 吴斌 王秀彦 刘增华. 高频纵向导波在钢杆中传播特性的研究[J]. 力学学报, 2007, 23(4): 538-543. DOI: 10.6052/0459-1879-2007-4-2006-271
Cunfu He, Yaxin Sun, Bin Wu, Xiuyan Wang, Zenhua Liu. Propagation Characteristic of High Frequency Longitudinal Guided Waves in Steel Rod[J]. Chinese Journal of Theoretical and Applied Mechanics, 2007, 23(4): 538-543. DOI: 10.6052/0459-1879-2007-4-2006-271
Citation: Cunfu He, Yaxin Sun, Bin Wu, Xiuyan Wang, Zenhua Liu. Propagation Characteristic of High Frequency Longitudinal Guided Waves in Steel Rod[J]. Chinese Journal of Theoretical and Applied Mechanics, 2007, 23(4): 538-543. DOI: 10.6052/0459-1879-2007-4-2006-271

高频纵向导波在钢杆中传播特性的研究

Propagation Characteristic of High Frequency Longitudinal Guided Waves in Steel Rod

  • 摘要: 计算了钢杆中纵向轴对称导波模态的衰减频散曲线和群速度频散曲线. 分析了1~3MHz范围内高频纵向轴对称超声导波在钢杆中的传播特性. 理论分析表明,各高阶纵向模态都存在一个衰减最小值,在此衰减最小值所对应频率下的高阶模态能传播较远距离,可用于钢杆导波检测. 建立实验系统,采用轴对称同端激励接收的方法,根据第1次端面回波做出群速度和端面回波幅值随频率变化曲线,实验结果与理论分析基本吻合. 表明考虑材料衰减特性的钢杆频散曲线可以作为实验指导依据.

     

    Abstract: The attenuation dispersion curve and group velocitydispersion curve of ultrasonic guided waves in steel rod are calculatedwith consideration of the attenuation. Propagation characteristics of highfrequency longitudinal modes between 1MHz~3MHz in steel rod arestudied. In theory, there is one attenuation minimum in every high orderlongitudinal mode whose attenuation is the smallest in all modes at thespecial high frequency. The high order mode at this special frequency canpropagate a longer distance than other modes at the same frequency. Thisindicates that high frequency low attenuation longitudinal mode at thisspecial high frequency can be used for the inspection of steel rod. Theexperiments on steel rod of 22mm in diameter, 2m in length arecarried out usingultrasonic guided wave. Guided wave signals are excited andreceived by the same probe at the same end of the rod. The group velocityand amplitude curves of first endreflection against frequency are obtained. The experimental curves areconsistent with those dispersion curves of theory. This indicates that thedispersion curve of steel rod with consideration of attenuationcharacteristics can be a guidance to experiment.

     

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