近海风机叶片动力特性分析

The topic of offshore wind energy is attracting more and more attention as the energy crisis heightens.The blades are the key components of offshore wind turbines,and their dynamic characteristics directly determine the effectiveness of offshore wind turbines.With different rotating speeds and blade length,the rotating blades generate various centrifugal stiffening effects.To directly analyze the centrifugal stiffening effect of blades,the Rayleigh energy method (REM) was used to derive the natural frequency equation of the blade,including the centrifugal stiffening effect and the axial force calculation formula.The axial force planes and the first to third order natural frequency planes which vary with the rotating speed and length were calculated in three-dimensional coordinates.The centrifugal stiffening coefficient was introduced to quantitatively study the relationship between the centrifugal stiffening degree and the rotating speed,and then the fundamental frequency correction formula was built based on the rotating speed and the blade length.The analysis results show that the calculation results of the fundamental frequency correction formula agree with the theoretical calculation results.The error of calculation results between them is less than 0.5%.     

基于有限元的悬浮隧道模态分析

为研究悬浮隧道结构的振动特性,采用有限元软件对悬浮隧道进行数值模拟和模态分析,得到悬浮隧道系统的前5阶振型。模态分析应用结果表明：悬浮隧道是一种长周期的结构物,主要变形以水平振型为主。研究成果对悬浮隧道的早日应用有一定的参考价值。