摘要
采用在接触面上建立多个接触对以模拟叶根处微滑移的方法和控制变量法,获取稳定状态下二维叶根接触面上摩擦力和相对位移的迟滞回线,分析评估了参考点、网格分配、切向和法向载荷、接触刚度、摩擦因数等参数在微滑移中的影响,从一个新角度考察了叶根干摩擦微滑移的性能。分析结果表明在采用微滑移模型研究叶根连接时,不同参数的选择对其干摩擦性能均有影响。接触单元的数量影响结果的精度,接触面上参考点的选择影响迟滞回线的描述,切向载荷影响迟滞回线中相对位移的大小;法向接触刚度的降低会明显增加相对位移和微滑移区域的大小,切向接触刚度的增加使叶根处更容易进行类似刚体运动的宏观滑移;摩擦因数和正压力的增加使得微滑移区域增加,但两者的影响并不完全一样。同时,从耗散能的角度研究了接触参数的减振效果。
Several contact pairs were built on the contact surface to simulate the microslip at the blade root joint.Control variate method was employed to gain the hysteresis loop with friction force and relative displacements in two-dimensional blade root joints contact surface under steady vibration.Analysis and assessments were carried out for parameters such as reference nodes,mesh configuration,tangential and normal loads,contact stiffness and friction coefficient,providing a new insight for investigating the micro-slip property of blade root dry friction.The results showed that when investigating the behavior of blade root joints with micro-slip model,the choices of different parameters had influence on the dry friction properties.The contact element amount affected the accuracy of the results,and thereference nodes used gave different descriptions to the hysteresis loop.Tangential load made the relative displacement in hysteresis loop different.The decrease of normal contact stiffness can increase the relative displacement and micro-slip region.The increase of tangential contact stiffness made the blade root move easier with macro-slip like rigid motion.Friction coefficient and normal pressure increased the micro-slip region,while the influence was not absolutely the same.Meanwhile,the damping effects of contact parameters were investigated by way of dissipated energy.
作者
陈俊杰
臧朝平
周标
PETROV E
CHEN Junjie;ZANG Chaoping;ZHOU Biao;PETROV E(Key Laboratory of Aero-engine Thermal Environment and Structure,Ministry of Industry and Information Technology,College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of Engineering and Design,University of Sussex,Brighton BN 1 9QT,United Kingdom)
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2019年第2期305-312,共8页
Journal of Aerospace Power
基金
国家自然科学基金(11372128)
国家自然科学基金委员会与中国工程物理研究院联合基金(U1730129)
江苏省基础研究计划(自然科学基金)(BK20161485)
中央高校基本科研业务费专项资金(20160019)
关键词
微滑移性能
干摩擦
涡轮叶盘
叶根连接
数值分析
迟滞回线
micro-slip property
dry friction
turbine bladed disc
blade root joints
numerical analysis
hysteresis loop
