舰载机弹射起飞动力学建模研究

Dynamic Modeling for Carrier-based Aircraft Catapult Takeoff

为了研究舰载机弹射起飞过程中的动态变化规律,对该过程建立部件级动力学模型。针对每一部件分别进行动力学分析,考虑起落架缓冲器阻尼油孔随压缩行程的变化、正反行程油孔面积的不同,以及由缓冲器侧壁正压力引起的摩擦力,最终建立包括弹射器、舰载机的细粒度弹射模型。模型可针对弹射起飞过程中,油液阻尼力、摩擦力以及侧壁支反力等缓冲器内力的变化特性进行仿真研究,为舰载机起落架的设计提供参考。数值仿真结果与实验对比分析表明,各参量变化与试验结果基本吻合。

In order to study the dynamic change laws of carrier based aircraft during catapult takeoff,a dynamic model based on components is established for this process.Analyzing each component separately with dynamic method,considering the change of damping oil hole of shock absorber of landing gear with the change of stroke,different area of damping oil hole in the compression and reverse stroke,and friction force caused by normal direction pressure of the inner cylinder wall of shock absorber,a detailed model,including catapult and carrier based aircraft,is established eventually.This model can be used for simulation study of change characteristics of internal force of the shock absorber which includes the oil damping force,the friction force and the supporting counterforce of the inner cylinder wall during catapult takeoff,and are of some reference value to study for design of carrier based aircraft landing gear.Contrasting that numerical simulation results with experimental data shows that the change processes of some typical parameters is consistent with the real experimental data curves.