弹性飞行器气动伺服弹性耦合动力学仿真  

A Numerical Simulation of Aeroservoelastic Coupling Dynamic for the Elastic Aircraft

作　　者：杨炳渊[1] 樊则文[1] 

机构地区：[1]上海航天技术研究院第八设计部,上海200233

出　　处：《宇航学报》2009年第1期134-138,共5页Journal of Astronautics

摘　　要：针对常见的轴对称串置翼布局外形,结构方面以分枝模态法为基础,气动力方面分别采用修正活塞理论和细长体理论计算升力面和旋成体机身的非定常气动力,干扰因子法考虑翼身干扰和串置翼下洗,通过控制系统敏感元件输入参数与结构振型的关系,输出控制力对结构振动的激励关系,考虑弹性振动产生的非定常气动力,建立由模态坐标运动微分方程和控制系统传递函数联合表示的受控弹性飞行器耦合系统动力学的数学模型。在此基础上,用状态空间法将结构运动微分方程和控制系统传递函数转换成状态方程,在时域内用龙格-库塔法实现系统动力学响应的数值仿真,并借以判断系统的动力学稳定性,辨识稳定性的临界参数。应用本文方法完成了算例飞行器无控状态的经典颤振及受控状态的气动伺服弹性分析,证明了方法的可行性和有效性。通过改变控制系统参数和结构参数的仿真计算,总结出这些参数的影响规律。In this article, in allusion to the axial symmetry and tandem wings aircraft, based on the branch mode method and the relation between structure mode and I/O parameter of control system, result in a mathematical model concerning the coupling dynamic system of the controllable elastic aircraft. The mathematical model express as the move differential equations expressed by modal coordinates and the transfer function of control system. In the equations, the piston theory with compressive correction is used to calculate unsteady aerodynamic force of the wings and the rudders, and the linear perturbation slender body theory is used to calculate the fuselage＇s unsteady aerodynamic force. The wing-body interference and wing down-wash on tail is investigated by the interfering factor method, and the time retardation of down - wash is considered. The state space analysis is used to transform the move equations and the transfer function of control system to the state equations, and the numerical simulation of dynamic response is implemented in time-domain, and hereby the aereservoelastic stability is solved. Representative example of the application is presented and the method is also verified and has practical value. The influences of the structural frher＇ s parameters, the sensor position and the body＇s natural frequencies on the aeroservoelastic stability are also analyzed.

关 键 词：飞行器 系统动力学 气动伺服弹性 稳定性 数值仿真 

分 类 号：V211.47[航空宇航科学与技术—航空宇航推进理论与工程]