基于传热增广模型的轨迹优化与防热结构分析

在考虑飞行器结构温度约束的轨迹设计问题中,采用一般约束热流密度的轨迹优化模型存在反复迭代、不能考虑轨迹、传热之间耦合关系等缺点.针对这些问题,提出一种传热增广的轨迹优化模型.利用空间差分将传热方程转化为一阶微分方程组,与运动方程组成传热增广的系统状态方程,从而能在轨迹优化中对结构温度直接进行约束.算例仿真说明了基于增广...

Trajectory optimization based on heat-augmented model and analysis of thermal protection structure

In the trajectory design problem considering the temperature constraint of aircraft structure, the trajectory optimization model with general constrained heat flux has some disadvantages, such as repeated iteration, unable to consider the coupling relationship between trajectory and heat transfer. To solve these problems, a trajectory optimization model of heat transfer expansion is proposed. The heat transfer equation is transformed into a set of first-order differential equations by using spatial difference, and the system state equation of heat transfer expansion is formed with the motion equation, so that the structure temperature can be directly constrained in the trajectory optimization. The simulation of an example shows the efficiency of the solution based on the augmented model and the rationality of the result. On this basis, the interaction between reentry trajectory and thermal structure is analyzed, which provides a reference for the design of thermal structure in the scheme design stage.