基于小波变换的镁碳质耐火材料受压损伤声发射特征分析

Analysis of the Acoustic Emission Characteristics of MgO-C Refractory Damage Under Compressive Load Based on Wavelet Transform

运用声发射(Acoustic emission,AE)技术及基于小波变换的信号处理方法研究镁碳质(MgO-C)耐火材料受压损伤机制。通过AE技术检测材料受压损伤的声发射信号,采用小波变换方法对信号进行分解,运用小波能量系数,结合不同损伤相的物理特性,寻找与特定损伤机理相关的频率特征。结果显示,AE信号的能量主要集中在两种频率范围内,说明材料此时表现出两种不同的主导性损伤机制,为判别镁碳质耐火材料受压损伤机制提供了一种有效途径。

Acoustic emission （AE） technology and signal processing method based on wavelet transtorm were used for researching damage mechanism of MgO-C refractory under compressive load. AE signals of the materials un- der compressive load were detected by AE technology, the obtained AE signals were decomposed by wavelet trans- form, combined with wavelet energy coefficient and the physical characteristics of different damage phase, looking for frequency characteristics related to specific damage mechanism. The results show that the energy of AE signals has been mainly concentrated in two frequency range, it indicates that there are two different dominant damage mecha- nism, which provides an efficient way to discriminant damage mechanism of MgO-C refractory under compressive load.