运载火箭动力学天地差异性分析技术

Differentia Analysis between Space and Ground in Launch Vehicles Dynamics

针对运载火箭动力学关键参数偏差难以定量化分析的问题,提出了基于混合优化算法的运载火箭动力学天地一致性分析技术。首先针对运载火箭多专业独立设计模式下,动力学模型存在差异、参数偏差取值不同等问题,提出了基于源变量的总体回路集成仿真建模技术,实现了总体回路集成仿真。在此基础上,以包括关机时间、液位高度、飞行速度及姿态角等飞行参数和仿真参数偏差最小为目标,采用一种基于粒子群算法和遗传算法的混合优化算法,对影响飞行轨迹和姿态的关键参数进行了辨识,分析其天地差异性,最后通过仿真验证了所提方法的有效性。

The key parameters of launch vehicles dynamics is difficult to be analyzed quantitaticely,Therefore,this paper proposes a new method for differentia analysis between space and ground in launch vehicles dynamics based on hybrid optimization.First,giving a new simulation modeling method based on root-variable,supplied a top level simulation environment,which can reduce the differences between each specialties subjects dynamic modeling,the problem of key parameters margin considered repeated in traditional modeling can be avoided.Then,the identifying model of flying path and attitude parameters based on a hybrid optimization combined particle swarm optimization algorithm with genetic algorithm is established,the key parameters values differences between simulation and flight as the target function,such as cut off time,the height of liquid level,flight velocity etc.At last,the simulation results indicate that the identifying model can be used in differentia analysis between space and ground,and have achieved good results.