The Experiment Study On SH Wave Propagating Effectiveness Based On Waveguide

The operation of nuclear power equipment needs to carry high temperature,high pressure,radioactive medium,the damage caused by the operation of the pipeline leakage often cause catastrophic accidents.In this paper,a new type of on-line monitoring and wave excited device waveguide is introduced,and the related experimental study on ultrasonic coupling is designed for testing the effectiveness.This research is to provide the necessary reference for damage monitoring on the nuclear power plants pipeline,which is also to improve China’s nuclear power safety and economy.The main contributions of the thesis are summarized as follows:(1)Determine the approximate structure of bounded plate as line source excitation mode.In this paper,the basic characteristics of SH wave in free plate and the excitation mode of guided wave are studied.The SH mode guided wave is used as the detection source.In this paper,the theoretical and experimental results are presented to verify the optimal approximation of the guided waves in the SH plate by a bounded plate structure.(2)Design the structural dimensions of waveguide.Base on SH wave dispersion characteristics of line source structure in the free board,combined with high temperature environment,The design size of waveguide has been established.The method of simulation and experiment is to test the rationality of width design.(3)Study the coupling relationship between the guided wave and the measured work plate.Three kinds of coupling experiments of SH wave propagating is used for testing the effectiveness of waveguide,which is the dry coupling,copper powder coupling and weld coupling.The quantitative relation between the coupling effect and the pressure is established by introducing the parameters of reflection coefficient and transmission coefficient.The verification on copper powder coupling is the best way on coupling and calculating the best coupling press value.