摘要
现在超声检测主要发展方向之一是能监控生产过程中构件的损伤速率和材料的完整性及质量的级别判断。检测设备和方法在分析检测过程是一个相当复杂的,其中包括分析超声波在构件中的传播规律和一系列的电信号转换为机械信号和相反过程的信号转换。超声波在构件中传播的规律可以由材料的属性和各向同性预先确定。本文重点阐述了机械振动产生超声波,并利用有限元(FEM)和有限差分(FED)方法模拟在无损检测过程中的波动传播过程。并且通过计算机程序模拟二维超声波的传播,散射的数值模拟与几何理论结果是相符合的。
Whether can monitor the rate of components damage in production, and estimate the level of integrity and quality are two development of ultrasound detection. The analyzing process of detecting method for instruments is rather complicated, which includes analyzing the rule of ultrasonic propagating in components and the conversion between electronic signal and mechanism signal. The behavior of the structure is predetermined in general by the non linear material properties and anisotropy. This problem could be treated as complex one, dealing with the problems of electrical and mechanical origin. This paper is devoted to the mechanical ones, trying to find ways for effective simulation of the signal propagation in the structure subjected to nondestructive testing. And the two-dimensional ultrasonic wave propagation has been simulated by computer program and the scattered wave is well explained by a geometrical theory.
出处
《国外电子测量技术》
2008年第5期9-11,共3页
Foreign Electronic Measurement Technology
关键词
波传播
超声波
数值模拟
wave propagation
ultrasonic
numerical analysis
