摘要
为指导基于超声导波的管道无损检测,计算并分析水平切变(shear horizontal,SH)导波在具有自由内表面、外表面的弹性各向同性管道周向波导中传播的频散和波结构特性,将这些特性与平板SH导波的对应特性进行对比分析。在周向SH导波的频散特性推导中引入了传播方向弧长的修正算法。研究结果表明,表征管道周向弯曲程度的内半径、外半径之比越大,则管道周向SH导波的频散和波结构特性越接近于平板SH导波的情况,并且较低频率下的平板SH导波的SH0模式和管道周向SH导波的CSH0模式较适合缺陷的检测。
SH guided wave dispersion characteristics and wave structure for free surface isotropic elastic pipe circumferential waveguide were calculated and analyzed to guide pipeline inspection, and these characteristics were compared with those of the plate SH（shear horizontal） guided wave. A new propagation direction arc calculation algorithm was proposed for pipe circumferential SH guided wave formulation. The study results show that the bigger the ratio of inner and outer radii, the more the pipe circumferential SH guided wave will resemble the plate SH guided wave in the dispersion characteristics and wave structure, and plate SH0 mode and pipe circumferential CSH0 mode are suitable for defect detection.
出处
《中国机械工程》
CAS
CSCD
北大核心
2009年第2期146-149,共4页
China Mechanical Engineering
基金
国家863高技术发展研究计划资助项目(2007AA06Z223)
关键词
管道周向SH导波
频散曲线
波结构
导波工作点选择
pipe circumferential SH guided wave
dispersion curve
wave structure
guided wave operating point selection
