声发射信号通过螺栓紧固联接界面的试验研究

在声发射的实际应用中,采集的声发射信号很多都是经过不同界面传输的,其传播特性也受到不同程度的影响,其中通过螺栓紧固联接平面界面传播是最常见的一种。分析了引起声发射信号衰减的各种原因,采用成都动科信号采集卡及其相应的分析系统,模拟设计几组螺栓紧固联接平面试件来进行声发射信号传播特性研究。初步分析研究了在表面粗糙度、压力、接合面介质等不同条件下声发射信号通过螺栓紧固联接平面界面传播后的衰减情况,为声发射检测复杂结构设备具有重大参考意义。

Experimental study of acoustic emission signal acrossing

In the practical application of acoustic emission, acoustic emission signal transmit across different interface, and the propagation characteristics are influenced to various extents, the propagation acrossing plane interface tighten and connected by bolt is one of the most common.The different causes of attenuation of acoustic emission signal were analyzed in this paper. Several groups of plane specimens tighten and connected by bolt were analog designed to study the propagation characteristic of acoustic emission signal by using signal acquisition card of cheng-du-dong-ke and the corresponding analysis system. The propagation attenuation acrossing interface tighten and connected by bolt of acoustic emission signal were preliminarily analyzed under the different conditions of surfaceness, pressure, medium of mating face etc. This is an important reference to detect complex-structured equipment by acoustic emission.