某型飞机疲劳试验过程中关键结构的AE监测

介绍了某型飞机疲劳试验过程中的关键结构的声发射检测技术。根据监测的实时性要求，采用参数趋势分析，辅以幅值滤波和空间滤波技术对信号进行实时处理，特别是在空间滤波技术中，采用损伤区域内事件数占总事件数的比例来分析裂纹的发展状况，并以相关参数的变化趋势进行论证，取得了满意结果。成功预报了右外翼三墙处某螺栓孔裂纹的萌生，为试验的顺利进行起到了重要保障。

AE Monitoring of the Critical Structures During Aircraft Fatigue Test

Technical details of using acoustic emission（AE） to monitor the critical structures during aircraft fatigue test were introduced. Due to the requirement for real time monitoring, parameter trend analysis（PTA） technique, assisted by amplitude-based and space--based filtering techniques, was adopted to analyze the signal in real time. Especially in the space-based filtering analysis technique, the proportion of the events from damaged area to the total events was utilized to analyze the state of crack, which was further verified by correlative PTA. Satisfactory result was obtained and success was made in predicting a crack germination which came from the third wall of right airfoil. These results provided important guarantee for the fulfillment of the fatigue test.