舰载机着舰的动力学建模

Research on the dynamic modeling for the landing of a carrier-based aircraft

为了实现舰载机精确着舰时的飞行控制系统设计,应具备完善的舰载机动力学模型。针对已公开的线性扰动模型较为单一且多数不完整的情况,根据舰载机的性能参数和标准小扰动理论,完成了对其着舰阶段的非线性动力学建模,基准状态配平以及纵向运动的线性化,得到能描述舰载机在平静大气和舰尾气流场下着舰的线性模型。根据舰载机的本体特性综合设置数值仿真条件,验证表明线性模型的精度较高。分析了将气流扰动加入线性模型的方法,通过理论分析和仿真比较得出,舰尾流的水平速度分量对线性模型的精度有很大影响,在扰动线性化的过程中不能忽视。

A perfect dynamic model of a carrier-based aircraft contributes significantly to perfect implementation of its carrier landing control system. However, the available linear perturbation models of a carrier-based aircraft are single and mostly incomplete. In this context, based on the performance parameters of a carrier-based aircraft and the standard small-perturbation theory, the nonlinear dynamic modeling for the landing stage, the trimming under the reference state and linearization of the longitudinal motion were completed, and a linear model for describing the landing of the carrier-based aircraft in a calm atmosphere and ship burble was attained. According to the natural properties of the carrier-based aircraft, the numerical simulation conditions were comprehensively set and the dem-onstration results showed that the precision of the model was high. An approach to introduce influences caused by ship burble into the perturbed linearized model was discussed and it showed through theoretical analysis and simula-tion comparison that the horizontal component of burble velocity greatly affected the precision of a linear model, and in the linearization of perturbation, it shall not be neglected.