基于固定界面法的旋转裂纹叶片动力学特性分析  

Dynamic Characteristics Analysis of Cracked Rotating Blade Based on Fixed-interface Method

作　　者：陈雪莲[1] 曾劲 马辉[3,4] CHEN Xue-lian;ZENG Jin;Ma Hui(Department of Information Engineering,Liaoning Provincial College of Communications,Shenyang 110122,China;School of Mechanics and Aerospace Engineering,Southwest Jiaotong University,Chengdu 611756,China;School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819,China;Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China,Shenyang 110819,China)

机构地区：[1]辽宁省交通高等专科学校信息工程系,沈阳110122 [2]西南交通大学力学与航空航天学院,成都611756 [3]东北大学机械工程与自动化学院,沈阳110819 [4]航空动力装备振动及控制教育部重点试验室,沈阳110819

出　　处：《航空发动机》2022年第6期105-109,共5页Aeroengine

基　　金：应用技术研究科研项目(lnccjyky202206);国家自然科学基金(11772089);中央高校基本科研业务费专项资金(N170308028,N170306004);辽宁省高等学校创新人才支持计划(LR2017035)资助。

摘　　要：为了实现裂纹旋转叶片在复杂环境载荷作用下非线性振动特性求解的高效性和准确性,以某型航空发动机压气机叶片为研究对象,综合考虑旋转叶片的刚/软化效应、裂纹的呼吸效应和气动载荷的影响,采用固定界面模态综合法对旋转裂纹叶片进行了84.83%的自由度缩减,并通过与未减缩模型前3阶动频以及振动响应的对比,验证了减缩模型的有效性。结果表明:叶片裂纹呼吸特性取决于离心载荷和气动载荷的联合作用,且在低转速下气动载荷占主导,而在高转速下离心载荷占主导;减缩模型相对于未减缩模型在进行响应求解时能提升一定的求解效率,在低转速下提升约37.35%,而在高转速下提升约12.33%;在高频激励下减缩模型的计算精度较低频激励下的稍差,应根据实际情况合理选择激振频率,并对结果精确性作相应的验证。In order to achieve high efficiency and accuracy of solving the nonlinear vibration characteristics of a cracked rotating blade under complex environmental loads,an aeroengine compressor blade was studied,the stiffening/softening effect of the rotating blade,crack breathing effect and aerodynamic load effect were considered. The fixed-interface mode synthesis method was used to reduce the freedom of the cracked rotating blade by 84.83%. The effectiveness of reduced model was verified by comparing with the first three order dynamic frequencies and vibration responses of unreduced model. The results show that the blade crack breathing characteristics mainly depend on the combined action of centrifugal load and aerodynamic load,and the aerodynamic load dominates at low speed,while centrifugal load dominates at high speed. The reduced model has a higher computational efficiency compared with the unreduced model which is about37.35% at low speed and 12.33% at high speed. The calculation accuracy of the reduced model under high frequency excitation is slightly lower than that under low frequency excitation. Therefore,the excitation frequency should be reasonably selected according to the actual operation situation,and the accuracy of the results should be verified accordingly.

关 键 词：模型减缩 振动 固定界面法 压气机叶片 裂纹呼吸特性 气动载荷 离心载荷 

分 类 号：V231.96[航空宇航科学与技术—航空宇航推进理论与工程]