基于圆柱体缺陷构件的超声探伤重构研究

圆柱体构件中非轴对称人造缺陷偏心圆孔的超声探伤一直是无损检测的难点。基于脉冲反射原理设计超声实验平台,根据检测回波信号判定偏心圆孔缺陷所呈现的特征。在实验研究基础上,针对声场在圆柱体工件内部的传播情况,根据惠更斯原理以圆柱体为发射声源,基于k-wave仿真工具箱建立仿真平台,并利用声学传感器接收声波信号,设计的仿真平台能够实现360°同时刻采集工件的发射信号,同时利用传播过程中声压强弱的变化构建声场模型。根据采集的信号采用逆时反演重构模型,直观可视化地重构了内部缺陷的位置形状信息。

Research of Based on Circular Hole Defect Eccentric Ultrasonic Flaw Detection Reconstruction

Because the non axisymmetric artificial defects of eccentric circular hole has been a difficult point of the nondestructive inspecting of ultrasonic flaw detection,in this paper,based on the design of ultrasonic pulse reflection principle experiment platform,the detection of echo signal to determine characteristic of eccentric circle hole defect are presented. On the basis of experimental research,to solve the problem of the spread of the acoustic field inside the cylinder workpiece, according to Huygens principle to the cylinder for emission source,simulation platform which is based on k - wave simulation toolbox,and by using acoustic sensor receiving acoustic signal,the design of simulation platform can achieve 360 degrees emission collection of artifacts with time signal,at the same time using the change of sound pressure in the process of the weak acoustic field model is constructed. According to the collected signals and inverse reconstruction model,the position of internal defects of shape information is reconstructed.