高超声速飞行器动态稳定性建模仿真研究

The Research and Simulation on Dynamic Modeling of Hypersonic Vehicles

在高超声速飞行器稳定性优化控制的研究中,高超声速飞行器系统建模中存在部分状态量不可精确测量问题。为解决上述问题,提出一种采用高阶滑模微分器的动态稳定性建模方法。在传统建模基础上,根据高超声速飞行器系统原理,利用可准确测量状态量对不可精确测量状态量进行重构,设计了动态稳定性建模方案。引入高阶滑模微分器用于状态重构系统信号的滤波与求导,收敛速度快且估计精度高,保证了所建立动态模型的稳定性和精确性。仿真结果表明,重构的航迹角和攻角响应速度快且稳定性好,重构的俯仰角速度有效抑制了弹性振动干扰,为飞行器稳定性优化设计提供了科学依据。

For the problem that part of the states in traditional modeling method for hypersonic vehicles can not measured accurately,a dynamic modeling method based on high-order sliding mode differentiator was proposed in the paper. On the basis of the traditional model,a dynamic modeling scheme was designed. Using the state which can be accurately measured,the amount of non-accurate measurement states was reconstructed according to the principle of hypersonic aircraft systems. High-order sliding mode differentiator was introduced to signal filtering and derivation for state reconstruction system. With high-speed convergence and high-accuracy estimation,stability and accuracy of the dynamic model can be ensured. Simulation results show that the reconstructed track angle and angle of attack converge quickly and have good stability,and the reconstructed pitch angular velocity effectively inhibited the elastic vibration disturbance.