基于翼型内部结构的风力机叶片动力学特性有限元分析

Finite element analysis of the dynamic characteristics of wind turbine blades based on the internal structure of the airfoil

基于ANSYS Workbench软件,对翼型内部结构为单腹板和双腹板的风力机叶片进行了模态、应力和应变分析,获得了叶片前6阶振动频率、应力分布云图和叶片变形云图。研究结果表明,在静频情况下,单腹板结构的一阶振动频率为4.052 7Hz,双腹板结构为4.048 6Hz,且单腹板结构的各阶固有频率均比双腹板结构略大;在转速作用下,单腹板结构的第一阶振动频率增加了0.164 4 Hz,双腹板结构增加了0.162 9Hz,单/双腹板风力机叶片振动频率的变化规律受转速影响的差异很小;在相同载荷作用下,单/双腹板结构的最大应力分别为127.77 MPa和124.21 MPa,单/双腹板结构的叶尖挠度分别为378.16 mm和347.54mm,故双腹板风力机叶片的力学性能要优于单腹板风力机叶片。

Based on ANSYS Workbench software, the modal, stress and deformation analysis of wind turbine blade with single web and double web structure was carried out. The first six order vibration frequency, the stress nephogram and deformation of blade are acquired. The analysis results show that the first order vibration frequency of the single web structure is 4.052 7 Hz, and that of the double web structure is 4.048 6 Hz, and the natural frequency of the wind turbine blade with single web structure is a little bigger than that of the double web structure. Then under rotating speed, the first order vibration frequency of single web structure is increased by 0.164 4 Hz, the double web structure is increased by 0. 1629 Hz, and the variation law of the vibration frequency of wind turbine blade with single and double web is very small.Besides, under the same load, the maximum stresses of the single web structure and double web structure were 127.77 MPa and 124.21 MPa, the tip deflection of the single web structure and double web structure were 378.16 mm and 347.54 mm, it is found the mechanical properties of the double web wing structure wind turbine blade is stronger than that of the single web wing structure through the stress analysis.