考虑接触刚度的航空发动机模拟整机模型降维及修正  

Dimensionality reduction and modification for aero engine simulator model considering contact stiffness

作　　者：高程明 何俊增 刘家璇 姜东[1,3] 卢愈 张大海[1,2] 费庆国 GAO Chengming;HE Junzeng;LIU Jiaxuan;JIANG Dong;LU Yu;ZHANG Dahai;FEI Qingguo(Jiangsu Engineering Research Center of Aerospace Machinery,Southeast University,Nanjing 210096,China;School of Mechanical Engineering,Southeast University,Nanjing 210096,China;School of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing 210037,China;AECC Hunan Power Plant Research Institute,Zhuzhou 412002,China)

机构地区：[1]东南大学江苏省空天机械装备工程研究中心,江苏南京210096 [2]东南大学机械工程学院,江苏南京210096 [3]南京林业大学机械电子工程学院,江苏南京210037 [4]中国航发湖南动力机械研究所,湖南株洲412002

出　　处：《推进技术》2025年第1期264-274,共11页Journal of Propulsion Technology

基　　金：国家杰出青年科学基金(52125209);国家自然科学青年基金(52005100);江苏省科技厅重点研发产业前瞻项目(BE2022158);江苏省优秀青年科学基金(BK20231542);江苏省科协青年科技人才托举工程(TJ-2022-043)。

摘　　要：针对航空发动机建模过程中普遍存在的精确度和计算效率难以同时满足的问题,提出了一种考虑接触刚度的航空发动机模拟整机模型降维及修正方法。分别建立航空发动机转子和机匣的三维有限元模型,并运用薄层单元来模拟转子轮盘间的端齿接触以及机匣间的螺栓接触界面;基于固定界面模态综合法,对模型进行降维处理,保留接触界面和支承位置处的关键主节点,分别得到转子和机匣的降维模型;运用灵敏度方法,结合转子模态试验和机匣模态试验的结果,对转子和机匣降维模型中的接触刚度进行修正;将修正后的转子降维模型和机匣降维模型进行组装,得到航空发动机模拟整机模型。开展模拟整机模态试验,将修正后的模拟整机模型的计算结果与试验数据进行对比。结果表明,修正后的模型前两阶弯曲模态频率误差控制在1.22%以内,且以Matlab软件为计算平台,进行了五次迭代修正计算,平均每次计算时长仅为2.1 s,验证了所提方法的准确性和高效性。研究结果为航空发动机建模及修正提供了一种新的有效手段,在满足了航空发动机模拟整机修正精度的同时,显著提高了模型修正的计算效率。To tackle the challenge of balancing accuracy and computational efficiency in aero engine modeling,a method for dimensionality reduction and model modification of an aero engine simulator was proposed,incorporating considerations of contact stiffness.Three-dimensional finite element models for the rotor and casing were created and thin-layer element technology was simulated the end tooth contact interface between the rotor disks and the bolt contact interface between the casing.The models were dimensionally reduced using fixed interface modal synthesis,preserving critical master nodes at contact interfaces and support positions,resulting in dimensionality reduction models of both the rotor and the casing.Contact stiffness modifications were made to the dimensionality reduction models of the rotor and casing based on the results of rotor modal test and casing modal test,employing the sensitivity method.The modified rotor dimensionality reduction model and the modified casing dimensionality reduction model were assembled into the final simulation model and compared with experimental data through modal tests.The results indicate that the modified model’s frequency errors for the first two bending modes stayed within 1.22%,and the iterative calculation process was executed 5 times,using Matlab,with each iteration averaging 2.1 s per iteration,confirming the precision and effectiveness of the method.The research results provide a new and effective method for aero engine modeling and modification,which not only meets the modification accuracy of aero engine simulator,but also significantly improves the computational efficiency of model modification.

关 键 词：航空发动机模拟整机 模型修正 薄层单元 降维 接触刚度 

分 类 号：TH212[机械工程—机械制造及自动化] V231.9[航空宇航科学与技术—航空宇航推进理论与工程]