库伦摩擦对二元翼面气动弹性特性的影响  

INFLUENCE OF COULOMB FRICTION ON TWO-DIMENIONAL AEROELASTIC AIRFOILS

作　　者：陆磊[1] 李敏[1] 甘宽 

机构地区：[1]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《工程力学》2015年第5期250-256,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(11232012;11372320)

摘　　要：通过数值方法和谐波平衡法研究库伦摩擦对翼面气动弹性特性的影响。分析带有摩擦的气动弹性系统中初始条件敏感性,以此说明常规动力学方程中阻尼与库伦摩擦的区别,并通过能量表达式阐述造成两者差异的原因。结果显示,气动弹性系统中引入库伦摩擦可以提高系统的颤振速度,但颤振速度的变化与初始条件有关。表面上,增加阻尼或引入库伦摩擦都可以提高颤振速度和减小俯仰振幅。但对于只有阻尼的线性系统,初始条件的变化没有改变系统的能量平衡,而库伦摩擦的引入则改变系统的能量平衡关系,使得系统颤振速度和颤振频率与初始条件相关。Numerical methods and the harmonic balance method are adopted to study the influence of coulomb friction on aeroelastic airfoil systems. The initial condition sensitivity in aeroelastic systems with coulomb friction is analyzed, and the differences between damping and coulomb friction in conventional dynamic equations are illustrated through the energy expression. The result shows that coulomb friction can improve flutter speed which is related to the initial condition. Apparently, the increase of pitch damping or introduction of coulomb friction can improve system flutter speed and reduce pitch amplitude. However, for linear systems with damping, changes in initial conditions do not change the system energy balance, and the introduction of coulomb friction changes the system energy balance and makes the flutter speed and the flutter frequency related to the initial condition.

关 键 词：气动弹性 库伦摩擦 初始条件 阻尼 颤振速度 

分 类 号：O343[理学—固体力学]