Measurement of dispersion curve of flexural mode guided wave at low frequency in pipeline
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摘 要
将低频下管道的弯曲振动类比成梁的弯曲振动,采用经典梁理论计算其理论导波频散曲线;通过设置三对等间距布置的加速度传感器,测得振动信号,提取弯曲模态导波频散曲线,结果证明了该方法的有效性,且加速度传感器间的间距越大,效果更好。试验所得的频散曲线与理论频散曲线在低频段拟合较好,高频段有较大偏差,这表明经典梁理论在频率较高时误差较大。
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Abstract
Pipes bending at low frequency can be considered as bending beams, and thus the classic beam theory can be used to calculate the theoretical dispersion curves. By measuring the vibration along the pipe at three equally spaced locations, the dispersion curve of the flexural mode in pipes is extracted. It is also found that larger spaces show better performance. The experimental dispersion curve fits well at the low frequency, but shows a big deviation at high frequency, indicating that the classic beam theory validates at low frequency.
中图分类号 TG115.28 DOI 10.11973/wsjc202105002
所属栏目 试验研究
基金项目 国家自然科学基金项目(51709216);高性能舰船技术教育部重点实验室开放基金课题资助项目(gxnc19051803);中央高校基本科研业务费专项资金资助项目(2020Ⅲ007XZ)
收稿日期 2020/8/7
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备注杨志春(1982-),男,博士,工程师,主要研究方向为机械设备的无损检测
引用该论文: YANG Zhichun,WU Wenjun. Measurement of dispersion curve of flexural mode guided wave at low frequency in pipeline[J]. Nondestructive Testing, 2021, 43(5): 5~7
杨志春,伍文君. 管道低频弯曲模态导波频散曲线的测定[J]. 无损检测, 2021, 43(5): 5~7
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参考文献
【1】ROSE J L.Ultrasonic guided waves in solid media[M].Cambridge:Cambridge University Press,2014.
【2】郑祥明,赵玉珍,史耀武.兰姆波频散曲线的计算[J].无损检测,2003,25(2):66-68.
【3】STEFAN S,NICOLAE C,MIRCEA G,et al.Extraction of dispersion curves for waves propagating in free complex waveguides by standard finite element codes[J].Ultrasonics,2011,51:503-515.
【4】HAN J H, KIM Y J,KARKOUB M.Wave propagation modeling of fluid-filled pipes using hybrid analytical/two-dimensional finite element method[J].Wave Motion,2014,51:1193-1208.
【5】许西宁,余祖俊,朱力强,等.半解析有限元法分析兰姆波频散特性[J].仪器仪表学报,2013,34(2):247-253.
【2】郑祥明,赵玉珍,史耀武.兰姆波频散曲线的计算[J].无损检测,2003,25(2):66-68.
【3】STEFAN S,NICOLAE C,MIRCEA G,et al.Extraction of dispersion curves for waves propagating in free complex waveguides by standard finite element codes[J].Ultrasonics,2011,51:503-515.
【4】HAN J H, KIM Y J,KARKOUB M.Wave propagation modeling of fluid-filled pipes using hybrid analytical/two-dimensional finite element method[J].Wave Motion,2014,51:1193-1208.
【5】许西宁,余祖俊,朱力强,等.半解析有限元法分析兰姆波频散特性[J].仪器仪表学报,2013,34(2):247-253.
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