Acoustic Emission Monitoring of Pivots of Main Landing Gear Cylinder Column During Fatigue Test of a Full-scale Aircraft Body
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摘要: 某型飞机全尺寸机体疲劳试验过程中的无损检测和声发射(AE)监测对该型飞机疲劳定寿、确定修理周期及未来改进型疲劳细节设计起着十分关键的作用。起落架地面载荷试验是疲劳试验的重要组成部分，需要声发射监测的区域包括起落架梁和上、下枢轴等关键部位。针对试验过程的强冲击和强噪声干扰，作者利用声发射信号参数的趋势分析、基于时域和频域的滤波技术、相关分析方法和基于空间的滤波技术，实现了对这些目标的实时监测并成功地监测出上、下枢轴磨损等故障。Abstract: The fatigue test of a full-scale aircraft body aimed to understand the initiation and development of fatigue damage and fatigue crack of its critical structures, and hence to determine fatigue life, maintenance and repairing cycles of the aircraft. The work of nondestructive testing and acoustic emission (AE) monitoring during the whole fatigue test played a key role in guaranteeing the success of the test and in achieving the prescribed goal. The fatigue test of main landing gears under the load simulating the taking off and landing on conditions formed an essential part of this fatigue test. The main structures to be monitored were the beams and pivots. In order to obtain AE signals related with fatigue damages under interferences due to high impact and background noises, present authors used the combination of trend analysis, spatial filtering, time-based, amplitude-based and frequency-based filtering techniques, together with multi-parameter identifications, and realized the real time monitoring of the upper pivot damage during the fatigue test.
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Keywords:
- Acoustic emission testing /
- Aircraft /
- Fatigue test /
- Landing gear /
- Trend analysis
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