环境参数变化对管道结构健康检测的导波检测影响探究

摘要

The influence of ambient temperature and applied load on compressed pipes were theoretically analyzed and with the help of ANSYS finite element analysis software,the time reversal method was introduced to enhance the reflection energy at the defect's position,in addition,the corresponding relationship between the ambient parameters and the echo reflectivity was es-tablished,changing the defects type. The impact results were compared. Both theoretical analysis and simulation results show that,the effect of the change of the temperature and applied load parameters on the detection signal mainly reflect on the changes which is waveform of time shift and reflect wave amplitude,the delay of detection signal increases uniformly with the linear in-crease of compressed pipes internal pressure value,and the effect of the change of the environmental temperature on the detection signal varies with different types of defects,which provides the basis for guided wave inspection of pipes.%文中就周围环境温度和外加载荷对承压管道超声导波结构健康检测的影响进行理论分析,采用ANSYS有限元分析软件进行数值模拟;引入时间反转法增强激励信号在缺陷位置的反射能量,建立周围环境温度和外加载荷参数变化与缺陷回波反射率之间的对应关系,改变缺陷类型并对其影响结果进行比较;理论分析和仿真实验均表明温度和外加载荷参数的变化对检测信号的影响主要体现在波形的时移和反射回波波包幅值的变化上,检测信号的时延随承压管道内压值的线性增大均匀增加,而环境温度的变化对检测信号时移的影响随缺陷类型的不同而不同,为实际导波检测提供参考.