面向控制的高超声速飞行器一体化建模与分析

摘要

The design of air-breathing hypersonic vehicle (AHV) flight control system is facing some problems derived from the strong coupling and nonlinear characteristic in aerodynamic,structure flexibility,propulsion and flying attitude.In this paper,an integrated modeling method for aerodynamic-thermal-structure-propulsion of AHV is presented.Firstly,the method of parametric configuration modeling was adopted and the surface of vehicle was mashed with surface panel method.Then,inviscid flow aerodynamic forces and viscosity resistance caused by aerodynamic heating were calculated with engineering method.Finally,based on the thermal-flexible structure assumption and scramjet engine model,a coupling dynamic model of flexible airframe and propulsion was constructed.The experiments proves that the methods of parametric configuration modeling and aerodynamic forces calculating not only obtains high accuracy and computing efficiency,but also reflects the characteristics of the strong-coupling among flexible airframe,scramjet engine and flight control,it is also suitable for flight control law design and analysis.%针对吸气式高超声速飞行器气动力、结构弹性、推进、飞行姿态之间的强耦合与非线性给控制系统设计带来的问题,提出一种气动/热/结构/推进的一体化建模方法.首先采用参数化建模方法与面元法快速构建飞行器外形并划分网格,然后基于工程预估方法计算无粘流气动力和气动加热产生的粘性阻力,最后结合热弹性结构假设与超燃冲压发动机模型,构建弹性机体/发动机耦合动力学模型.仿真结果证明,采用的参数化建模与气动力计算方法精度高、计算速度快,构建的模型体现出弹性机体、吸气式发动机与飞行控制的强耦合特点,适用于飞行控制律的设计与分析.