摘要
根据Kallesφe大型水平轴风力机叶片模型下的动力学方程对无阻尼系统进行有限差分离散后,运用Greenberg气动理论施加分布气动力,得到不对称刚度和一般粘性阻尼的二自由度气弹方程。通过建立系统的线性定常状态空间方程,利用极点实部最大值对叶片的气弹稳定性进行了解析,得到了风速、转速、弹性模量、桨距角、空气密度和叶片密度的稳定性曲线,最后用系统的阶跃时间响应进行了验证。
According to Kallesφe＇s dynamic equations for large horizonal axis turbine blades,2-DOF aeroelastic equations with asymmetric rigidity and general viscous damping were derived by means of a finite difference discretization and Greenberg aerodynamic theory.Linearized stationary state space equations of the system were established.2-DOF aeroelastic stability of the blades were studied by analyzing the system＇s step response graphs and stability of variable parameters,such as,wind velocities,rotor speeds,elastic modulus,pitch angles,air densities and densities of blades.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第20期65-68,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(10972124)
山东省教育厅科技项目(J08LB04)
关键词
水平轴
风力机叶片
状态空间
气弹稳定性
horizontal axis
turbine blade
state space
aeroelastic stability
