The Application of Acoustic Emission Technology in Aircraft Main Landing Gear Fatigue Test
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摘要: 介绍了某型飞机主起落架疲劳试验早期过程中多载荷作用下的关键结构的声发射实时监测技术。针对AE信号的复杂性，利用载荷滤波、幅值滤波以及空间滤波等多种滤波方法做信号处理，对处理后的AE信号以趋势分析为主，并以相关参数趋势变化进行验证。介绍了通过对提取到的关键部位在最大载荷下的AE信号的处理分析，取得了满意结果。不但掌握了各关键结构部位背景声发射信号的统计特征，还成功报告了加载系统的状况变化，为主起落架疲劳试验的顺利进行提供了保障作用。Abstract: Technical details of using acoustic emission for the real time monitoring of critical structures exerted by multi-load during aircraft landing gear fatigue test in the early stage were introduced. With respect to the complication of the AE signals, load-based filtering methods were employed to process the signals. After acquiring the processed AE signals, trend analysis was given priority for the diagnostic parameter, which was further verified by correlative parameter trend analysis. As an example, AE signals coming from the load affecting the critical part the most were processed and analyzed, and satisfactory result was obtained. Success was made in predicting the change of status of the loading system. These provided important guarantee for fulfillment of the main loading gear test.
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Keywords:
- Acoustic emission testing /
- Fatigue test /
- Landing gear /
- Trend analysis
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