变厚度壳单元的旋转叶片振动响应分析  

Vibration Response Analysis of a Rotating Blade of Variable Thickness Shell Element

作　　者：马辉[1] 能海强[1] 吕颂[1] 宋溶泽[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《机械设计与制造》2013年第11期109-112,共4页Machinery Design & Manufacture

基　　金：中央高校基本科研业务费专项资金资助(N100403008);教育部新世纪人才支持计划(NCET-11-0078)

摘　　要：以一个扭型、变截面旋转叶片为研究对象,基于ANSYS有限元软件,采用变厚度的壳单元来建立了叶片的有限元模型,并与实体单元进行对比,通过二者的固有频率和固有振型,验证本建模方法的准确性。随后分析了离心力和气动力共同作用下,实体建模和壳建模叶片的振动位移和等效应力随转速的变化规律。研究结果表明,采用变厚度壳单元可以很好的模拟叶片的固有频率和振动响应,但在计算等效动应力时和实体单元存在较大的误差。研究结果可为叶片结构设计提供理论依据。Taking a rotating variable cross-section twisted blade as the research object,the finite element model of the blade was established by using variable thickness shell element in ANSYS software.And the validity of the model was verified by comparing the static frequencies and their modal shapes of the shell element with these of the solid element.The change rule of displacement and equivalent stress with the rotating speed were analyzed by considering the effects of centrifugal force and aerodynamic force.The results show that the variable thickness shell element gives good agreement with the natural frequency and vibration response by solid element;however,there exits many errors to calculate equivalent dynamic stress because of the neglection in the thickness direction.The results will provide a basis for blade structure design.

关 键 词：旋转叶片 振动响应 壳单元 固有频率 ANSYS 

分 类 号：TH16[机械工程—机械制造及自动化] TK14[动力工程及工程热物理—热能工程]