任务模式变化对已定寿运输/轰炸类飞机疲劳可靠性影响

Influence of Mission Profile Variation on Fatigue Reliability of Life-Tested Transport or Bombardment Aircraft

本文通过梳理疲劳可靠性研究现状,针对运输/轰炸类飞机任务模式变化,分两个阶段讨论了影响疲劳可靠性的载荷因素,从谱型、剖面、超低空飞行和特殊载荷等对载荷分散性影响较大的参数进行了分析,提出了结合飞参数据和载荷相似性原理对定寿载荷谱修正的工程方法;采用此方法得到的载荷谱,通过与原始定寿载荷谱类比分析或补充试验,既充分利用已定寿型号飞机试验结果避免重复试验,又可获得具有相同分散性的高可靠度使用寿命,对快速应对任务模式变化,修订载荷谱和调整可靠性寿命具有重要参考价值。

By analyzing the progress of research on fatigue reliability in view of mission profile variation for transport or bombardment aircraft, this paper discusses the factors of load which influence the fatigue reliability by two steps.The analyses of parameters which contain spectrum type, mission profile, ultra-low altitude flight and special load have great influence on the dispersion of load. An engineering method combining flight parameter data and load similarity principle is proposed. The load spectrum obtained by this method can not only make full use of the test results of the aircraft with certain fatigue life, but also acquire high reliability fatigue life with the same disparity through load spectrum analogy analysis or supplementary test, which has important reference value in the aspects of correcting load spectrum, adjusting reliability fatigue life and replying variation of mission profile.