宇航学报 ›› 2014, Vol. 35 ›› Issue (5): 528-536.doi: 10.3873/j.issn.1000-1328.2014.05.006

• 飞行器设计与力学 • 上一篇    下一篇

考虑气动—推进—弹性耦合的高超声速飞行器面向控制建模与分析

张希彬,宗群,曾凡琳   

  1. 1.天津大学电气与自动化工程学院,天津 30072; 2. 天津科技大学理学院,天津 300222
  • 收稿日期:2013-04-19 修回日期:2013-08-20 出版日期:2014-05-15 发布日期:2014-05-25
  • 基金资助:

    国家自然科学基金(91016018, 61273092);教育部科学技术研究重大项目(311012);天津市基础研究重点项目(11JCZDJC25100)

Control Oriented Modeling and Analysis of a Hypersonic Vehicle with Coupled Aerodynamic Propulsion Elastic

ZHANG Xi bin,  ZONG Qun,  ZENG Fan lin   

  1. 1.College of Electrical Engineering & Automation, Tianjin University,Tianjin 300072, China;
    2.School of Science, Tianjin University of Science and Technology,Tianjin 300222, China
  • Received:2013-04-19 Revised:2013-08-20 Online:2014-05-15 Published:2014-05-25

摘要:

针对高超声速飞行器机身极易发生弹性振动,模型具有非线性、强耦合及不确定性等特点,提出了考虑气动—推进—弹性耦合的综合建模方法。首先,利用假设模态法计算弹性模态及弹性振动效应,采用斜激波和普朗特—迈耶流理论、Eckert参考温度法及一维可压缩流关系式估算气动力、俯仰力矩及推力,考虑气流黏性及机身弹性变形影响,加入了黏性及弹性振动效应,更接近于真实物理特性;然后分析了弹性振动引起的机体变形角及机身表面流体特性;并基于机理推导所获取的气动数据,利用曲线拟合方法,建立了考虑气动—推进—弹性耦合的高超声速飞行器面向控制模型。气动和动态特性分析结果表明,弹性振动改变了飞行器弹性模态及气动布局,面向控制模型降低了模型复杂度,并保留了机理模型的物理耦合特性及非最小相位现象。

关键词: 高超声速飞行器, 气动&mdash, 推进&mdash, 弹性耦合, 曲线拟合, 面向控制模型

Abstract:

Considering the elastic vibration of hypersonic vehicle, and the characteristics of nonlinearity, strong couplings and uncertainty, a dynamic model for a flexible hypersonic vehicle is developed. Firstly assumed modal method is used to compute the natural frequencies and mode shapes of the flexible structure. Oblique shock and Prandtl Meyer flow theory, Eckert’s Reference Temperature Method and 1 D flow relation are applied for estimating aerodynamic forces, moment and thrust of the hypersonic vehicle including viscous and flexible effects . Then, the deflections of vehicle body and aerodynamic characteristics on vehicle surface are analyzed. Finally, a control oriented model of the hypersonic vehicle aerodynamic is presented by using curve fitted approximations. The simulations show that the elastic vibration can change the flexible mode and aerodynamic layout, and the control oriented model not only can reduce the complexity of the model, but also retains physical characteristics and non minimum phase of the mechanism model.

Key words: Hypersonic vehicle, Aerodynamic propulsion elastic coupled, Curve fitted, Control oriented model

中图分类号: