充粘液管材中超声纵向导波的无损检测参数选择

基金项目:

国家自然科学基金(10074050)和上海市博士后科学基金资助项目

详细信息

Optimal parameters of ultrasonic guided waves non-destructive testing in viscous liquid-filled elastic pipes

摘要: 对超声纵向导波在充粘液管材中的传播特性进行了分析。在假设实频率和复波数的基础上,计算了导波的频散曲线,得到并分析了导波在系统中的位移分布曲线和衰减系数分布曲线,以此确定了用各模式检测管材中缺陷的最佳频厚积范围和检测的最佳位置。分析结果表明:频厚积在0.07MHz·mm以下,用L(0,1)模式检测较为理想,检测管内壁缺陷时更灵敏;在0.09~0.16MHz·mm之间用L(0,2)模式检测及在0.18~0.28MHz·mm之间用 L(0,3)模式检测时较为理想。

Abstract: Describes an investigation of the ultrasonic longitudinal guided waves propagation characteristics in viscous liquid-filled elastic pipes is gives. The dispersion characteristics were computed on the assumption that the frequency is real number and wavenumber is complex number. Then the displacement amplitude distributions and the attenuation distributions of guided waves were obtained and analyzed. Finally, the optimal location and frequency-thickness products of testing for pipes are chose by using them. The results shown that below 0.07 MHz-mm, using L(0,1) mode to detect the defect of the pipes filled with viscous liquid should be more effective, especially for the inner wall of pipes. The optimal detect ranges of frequency-thickness products of L(0, 2) and L(0,3) modes are 0.09-0.16 MHz-mm, 0.18-0.28 MHz-mm, respectively.