求解气动弹性系统动态特性的一种近似方法

 当考虑非定常气动力作用时,欲获得弹性飞机在任意状态下结构运动特性是甚为困难的。多年来国内外学者在这方面做了大量工作,提出了许多解决这一问题的方法。例如,p法,V-g法,p-k法,增广状态法和作图法等。它们具有各自的特点,也有其局限性。V-g法是求解颤振问题的一种简便有效且常用的方法。然而,人们通常认为V-g法只能给出颤振临界状态的动态特性及其邻域的近似特性,不能满意地给出任意状态下的动态特性。按飞行力学的观点,往往关心飞行速度小于颤振临界速度状态下的特

AN APPROXIMATE APPROACH TO ESTIMATE THE DYNAMIC CHARACTERISTICS OF AEROELASTIC SYSTEM

This paper gives a method for obtaining approximately the eigenvalues and eigenvectors under the unsteady aerodynamic environment in arbitrady states, The method is valid for the motion with multi-degrees of freedom and extends the relationship between the decay rate of structural motion as well as the fictitious structural damping coefficients and frequencies in the V-g method as seen in some references.The calculated results show that the present method is satisfied in estimating the dynamic characteristics of aero-elastic system. Comparing with the p-k method, the augment state method and the graphical techniques, the advantage of the proposed method is its simpli city.