升阻互补型垂直轴风轮的结构动态分析

为了避免风力发电机系统的共振而导致的系统损坏和噪音污染,并提高风力发电机叶片的耐用性与经济性,借助有限元计算方法,通过系统动态特性分析,得到了升阻互补型垂直轴风轮的动态特性及叶片的受力特性.结果显示,横梁是叶片支撑上容易出现危险的区域,其结构强度和抗疲劳度要求较高.在更换6根横梁的材料和尺寸之后,增加了其最大许用应力值,提高了风力发电机的安全系数,避免了风轮叶片支撑在低速旋转时频率游走于风轮第1,2阶固有频率之间的问题.升力型叶片受到近似于正弦函数的交变荷载,叶片表面主要受到拉应力的作用并且容易产生疲劳破坏.叶片在铺层时,增加0°纤维层的厚度可以使叶片抵抗更大的拉应力.

Structural dynamic analysis of lift-drag complementary vertical axis wind wheel

In order to avoid the system damage and noise pollution caused by resonance of the wind turbine system,and to improve the durability and economy of wind turbine blades,the finite element method was used to obtain the dynamic characteristics and mechanical properties of the lift-drag complementary vertical axis wind turbine through analysis of the dynamic characteristics of the system.The results show that the beams are easily damaged and require high structural strength and fatigue resistance.Replacement of materials and dimensions for six beams increased the maximum allowable stress,improved the safety factor of the wind turbine,and enabled the avoidance of the rotating blade at a low frequency ranging between the first-and second-order natural frequency.The lift-type blade was affected by the alternating load of the approximate sine function.The blade surface was mainly affected by tensile stress and was prone to fatigue failure.In terms of blade overlay,an increase of 0 ° of the fiber layer thickness could enable the blade to withstand a larger tensile stress.