非线性结构气动伺服弹性稳定性分析  

Aeroservoelastic stability analysis of non-linear structure

作　　者：刘德广[1] 李朝辉[2] 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100083 [2]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《北京航空航天大学学报》2006年第1期61-64,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：国防科工委预研项目(36.3.5)

摘　　要：真实的气动伺服弹性系统通常都含有各种非线性因素,它们会对系统的特性带来不可忽略的影响.为此采用一种频域方法对带有间隙的非线性结构进行气动伺服弹性稳定性分析.在气动伺服弹性运动方程中,非线性的结构刚度通过描述函数法转化为准线性的等效刚度,然后采用线性控制理论中的Nyquist方法来判断气动伺服弹性系统的稳定性并计算稳定裕度.以某一飞机的带有扑动和旋转间隙的受控翼面为例进行了数值计算.结果表明,旋转间隙对系统的稳定性影响是主要的;旋转间隙越大,系统稳定裕度越小.The real aeroservoelastic systems usually have various nonlinear factors, which may induce unnegligible effects on the characteristics of the systems. A frequency-domain method was applied to analyze the aeroservoelastic stability on nonlinear structures with gap. In the equations of motion of the aeroservoelastic system, the nonlinear structural stiffness was transformed to method. The stability and stable margin of the the quasi-linear equivalent stiffness by using the describing function aeroservoelastic system were analyzed by Nyquist method in linear control theory. Numerical calculations were conducted on a controlled wing with flapping gap and rotating gap. The results indicate that the flapping gap is the major factor which affects the stability, and the bigger the flapping gap is, the worse the stability of the system gets.

关 键 词：气动伺服弹性 间隙 准线性化 稳定性 

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]