目的 解决颤振飞行试验中的舵面振动响应异常问题,对典型结构响应故障分析诊断技术进行研究。方法 以地面激励试验中左、右舵面振动响应异常为切入点,通过操纵面扫频激励原理介绍,引入针对该故障问题的故障树。然后通过对故障树中不同故障底事件的逐个试验排查,定位左、右舵面振动响应异常的故障原因和发生机理,接着通过地面激励试验和飞行试验对故障排除效果进行验证。最后基于该故障的排除逻辑和过程抽象出颤振飞行试验典型故障的分析诊断流程,形成典型故障分析诊断技术。结果 左、右舵面振动响应峰峰值比值从1.5倍减小到1.08倍,右舵面的响应骤减频率从0.552增大到0.641。结论 通过该故障分析诊断技术的应用,有效解决了左、右舵面振动响应异常问题,并为后续颤振飞行试验中类似故障问题的发现、排查和最终解决提供了有益的参考和借鉴。
Abstract
To address the abnormal vibration response of control surfaces during flutter flight tests, the work aims to conduct a study on typical structural response fault analysis and diagnosis technologies. The abnormal vibration responses of left and right control surfaces in ground excitation tests were taken as the starting point. By introducing the principle of sweep excitation of control surfaces, a fault tree was established for this fault issue. Through individual testing and elimination of different bottom events in the fault tree, the fault causes and mechanisms of abnormal vibration responses in left and right control surfaces were identified. The effectiveness of fault elimination was verified through ground excitation tests and flight tests. Finally, based on the logical process of this fault elimination, a fault analysis and diagnosis workflow for typical flutter flight test faults was abstracted, forming the typical fault analysis and diagnosis technology. The peak-to-peak ratio of vibration responses between the left and right control surfaces decreased from 1.5 to 1.08, while the frequency at which the right surface's response sharply dropped increased from 0.552 to 0.641. The application of this fault analysis and diagnosis technology has successfully addressed the abnormal vibration responses in the left and right control surfaces, providing valuable reference and guidance for identifying, troubleshooting, and resolving similar issues in future flutter flight tests.
关键词
颤振 /
飞行试验 /
扫频激励 /
舵面 /
响应 /
频谱 /
故障
Key words
flutter /
flight test /
sweep excitation /
control surfaces /
response /
frequency spectrum /
fault
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