试验加载对双气腔缓冲器突伸性能影响研究

Study on the Impact of Test Loading on the Sudden Extension Performance of Dual-Chamber Buffers

摘要:

现代舰载飞机在弹射起飞时，通常利用前起落架在行程末端突伸来增加离舰迎角，起落架突伸性能的测定对型号研制具有重要意义。设计一种适用双气腔缓冲器式起落架突伸试验方案，利用某型飞机前起落架进行分析验证，并通过改变试验加载条件，分析不同加载条件对起落架突伸性能的影响。结果表明：对于双气腔式起落架，高压腔内气体温度在突伸前后变化较为剧烈，低压腔内部气体温度基本无变化，且加载保持时间对于缓冲器的突伸性能的影响远大于加载速率对突伸性能的影响，进行地面验证试验时应予以考虑。

Abstract:

Carrier-based aircraft usually increase the take-off angle of attack by extending the nose landing gear suddenly at the end of the stroke during catapult take-off. The measurement of the sudden extension performance of landing gear is of great significance for the development of the model. A test scheme for the sudden extension of landing gear with double-chamber cushioning device has been designed. The nose landing gear of a certain type of aircraft has been analyzed and verified. By changing the test loading conditions, the influence of different loading conditions on the sudden extension performance of landing gear has been analyzed. The test results show that for the double-chamber landing gear, the temperature in the high-pressure chamber changes dramatically before and after the sudden extension, while the low-pressure chamber hardly changes. And the holding time after loading has a greater impact on the sudden extension performance of the cushioning device than the loading rate, which should be considered in ground verification tests.