声发射信号在不同结构轴中传播特性研究

声发射信号的传播特性将直接决定故障特征提取及故障定位分析的准确性。本文通过二维有限差分格式建立了声发射信号在光轴、阶梯轴、阶梯退刀槽轴中的传播模型，分析了冲击载荷下（脉冲声发射信号）的轴本构响应，并进行了相应实验。模型仿真和实验结果对比分析表明：有限差分格式传播模型能准确地模拟声发射信号在不同结构轴中的反射、透射、衰减等作用下的传播特性。

Study on the Propagation Characteristics of Acoustic Emission in Different structural Shafts

The precision of fault feature extraction and damage locating by AE signal is determined by its propagation characteristics in different structures. In this paper, a two-dimensional explicit finite difference method is extended in AE signal model building of shaft, stepped shaft and stepped shaft with too withdraw groove; the constitutive behavior of the shafts under impact load is analyzed; the experiments of three different structural shafts are conducted. The results of the simulations and the experiments reveal that the propagation characteristics-reflection, transmission, attenuation-of AE signal in shaft, stepped shaft and stepped shaft with too withdraw groove are simulated correctly by using the model of AE signal built through the explicit finite difference method.