摘要
针对圆弧端齿开设螺栓孔会破坏圆弧端齿齿形结构的完整性、产生局部应力集中等问题,建立了带有螺栓预紧的动力涡轮盘轴圆弧端齿连接转子优化模型,基于ANSYS优化平台进行了带螺栓孔的圆弧端齿结构优化设计。分析结果表明,螺栓孔的开设对圆弧端齿齿底的强度削弱作用要比对凹(凸)齿本身的大,且将螺栓孔径向分布在圆弧端齿的节圆直径附近有利于降低圆弧端齿结构的应力和改善应力分布;在满足其他应力约束条件下,优化后的圆弧端齿最大等效应力比原始方案降低9.1%,端齿工作面最大接触应力降低44.6%,改善了圆弧端齿齿根附近的应力分布状态,同时也没有对动力涡轮盘轴转子变形产生影响。
In a bolted rotor with curvic couplings,the structure integrity of curvic coupling tooth may be damaged and local stress concentration may occur due to bolt holes.An optimization model for the power turbine bolted rotor with curvic couplings was established by considering the bolt axial preloading.Then the structure optimization design of power turbine rotor curvic coupling was completed based on ANSYS optimization platform.The results showed that the strength weakening effect of the bolt holes on the tooth root of curvic couplings is greater than that of concave(convex)tooth itself,and the bolt holes radial distribution near the pitch diameter of curvic couplings was beneficial to reduce the stress and improve the stress distribution of curvic couplings.Comparing with the original design,the maximum equivalent stress of the optimum curvic couplings was reduced by 9.1%and the max contact stress on the working face was reduced by 44.6%,which improves the tooth root stress distribution more homogenous and has no effect on the global deformation of the whole power turbine rotor.
作者
徐鲁兵
廖明夫
吕延军
XU Lubing;LIAO Mingfu;LYU Yanjun(School of Power and Energy,Northwestern Polytechnical University,Xi'an 710072,China;AECC Hunan Aviation Powerplant Research Institute,Zhuzhou 412002,Hu'nan,China;School of Mechanical and Instrumental Engineering,Xi'an University of Technology,Xi'an 710048,China)
出处
《机械科学与技术》
CSCD
北大核心
2023年第6期969-977,共9页
Mechanical Science and Technology for Aerospace Engineering
关键词
动力涡轮转子
圆弧端齿
应力
优化设计
power turbine rotor
curvic coupling
stress
optimization design
