立方非线性二元机翼突风响应仿真研究  

Response for 2D Airfoil Due to Gust with Cubic Nonlinearities

作　　者：刘伏虎[1] 马晓平[1] 

机构地区：[1]西北工业大学无人机特种技术重点实验室,陕西西安710065

出　　处：《计算机仿真》2012年第11期122-125,共4页Computer Simulation

摘　　要：研究突风响应气动弹性问题,由于飞行器高速飞行,动力系统响应直接影响系统的性能,而系统结构上的非线性增加了突风响应问题的复杂程度。为分析性能,提出以经典的二元机翼为对象,通过建立三自由度二元机翼在突风下的增广状态空间运动方程,针对立方非线性刚度弹簧系统,研究各自由度采用立方结构非线性系统响应。仿真结果表明系统采用线性刚度突风只影响系统响应振幅,沉浮弹簧采用立方非线性刚度系统后系统颤振速度变小,俯仰方向和操纵面扭转弹簧采用非线性刚度后系统颤振速度增大,结果可为研究三维机翼非线性颤振提供一定的研究基础。Gust response is a very interesting and valuable problem in aeroelastic field, and structural nonlinearity makes it more complex. This paper, took the classic 2D airfoil as the object and established the augmented state- space equations of airfoil systems with gust. Effect of cubic nonlinearities has been analyzsed and the simulation indi- cates that a gust just affects response range of a system with linear stiffness. Plunge nonlinear spring can decrease the flutter speed; pitch and control surface nonlinear spring can enhance flutter speed. This paper provides groundwork for nonlinear flutter of wing.

关 键 词：突风响应 气动弹性 立方非线性 

分 类 号：V215.3[航空宇航科学与技术—航空宇航推进理论与工程]