Study On The Influence Of Environmental Parameter Change On The Structure Health Detection On Pipeline Ultrasonic Guided Wave

With the rapid development of industry, the use of steel structure in heavy industry is increasing day by day, and the stability and safety of industrial steel facilities in the process of normal service have attracted much attention. Structural health monitoring technology in nondestructive detection in the process of increasing the service status of the equipment,become one of the primary detection method in industrial production facilities and service stage, in the field of modern industry aspects are involved. Changes in the pipeline is under bad environment of long-term experience temperature and load environmental parameters,failure due to fatigue, wear, corrosion, cyclic loading and creep in different degrees, if not timely detection can also cause defects within the structure, the structure safety hazards, poses a serious threat to the safety and environment and the economy. Ultrasonic guided waves have been widely used in structural health monitoring. However, the high frequency, high sensitivity, multi-mode and dispersion characteristics of guided waves make the difficulty of guided wave nondestructive testing technology more difficult.This thesis studies the progress in recent years, structural health monitoring has made the corresponding summary; changes of temperature and external load on the effect of ultrasonic guided wave nondestructive testing in pipes and other related problems encountered and the damage detection process were discussed. Considering the research on Numerical Simulation of simple temperature field and the load current is less constrained, and the numerical simulation research is an experimental research on important and necessary, so the establishment of a complete temperature and pressure environment numerical simulation is the foundation of environmental changes in structural health detection.The innovation of this article is using the LS-DYNA module of ANSYS software in 3D simulation of pressure pipeline model under the interaction of ambient temperature and ambient temperature, numerical simulation analysis, the pipeline pressure change on the effect of ultrasonic guided wave defect detection tube, combined with enhanced time reversal method of temperature and pressure conditions of small tube defects the detection ability,finally, in-depth analysis of signal data obtained by the numerical simulation of phase MATLAB program, explore the different temperature and pressure values of the propagation characteristics of guided waves in the pipeline, analysis of propagation characteristics of guided wave tube to complete the corresponding conditions for tube positioning and type identification of defects contribute to achieving better.