起落架摆振飞行试验实测数据分析

为了检验起落架系统的稳定性,国内首次在真实飞机上进行起落架摆振试验,通过在跑道上加装激励板,有效激起起落架摆振相关模态;采用模态单峰隔离结合最小二乘算法,通过模态参数识别进行试验数据分析;通过仿真数据验证该方法的正确性,并将其应用到某实测摆振试验数据分析。结果表明:飞行试验中起落架未发生摆振,本次试验中起落架是稳定的。

Data Analysis in Landing Gear Shimmy Test

In order to estimate the landing gear system stability, the first domestic shimmy test on landing gear were implemented, where shimmy modes of landing gear were excited by the plank fixed on the runway. Based on mode lobe separation combined with least square method, the test data were analyzed through identifying the modal parameters. The method was validated by simulating data with theory solution, and applied to analyze certain shimmy test data. The results show that landing gear shimmy does not occur in the flight test, which indicates the landing gear is stable.