一种无样机的航空发动机转子有限元建模方法  

A finite element modeling method of aero-engine rotor without physical prototype

作　　者：边杰[1,2] 梅庆[1,2] 臧朝平[3] 杨海[1,2] 

机构地区：[1]中航工业航空动力机械研究所,湖南株洲412002 [2]航空发动机振动技术航空科技重点实验室,湖南株洲412002 [3]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《广西大学学报（自然科学版）》2015年第2期389-396,共8页Journal of Guangxi University（Natural Science Edition）

基　　金：中国航空工业集团公司航空科学基金项目(20102108002;08B08001)

摘　　要：为解决无样机时大型复杂结构的有限元建模准确性问题,对有限元建模、模型修正和确定方法进行研究。首先以模拟转子为研究对象,由模拟转子的几何模型建立了5种不同网格密度的实体模型。模型1至模型5网格密度不断增大,通过计算各模型与最细化网格模型5的模态频率差异确定一个参考模型,模型1相对于模型5频率差异小于0.6%,可作为参考模型。但是参考模型的网格尺寸较大,不能作为整机模型中的部件模型,由此需要建立转子的简化模型。由于参考模型与试验模型的频率误差在3%以内,故可以利用参考模型对简化模型进行模型修正。最后进行了试验模型和修正后的简化模型的相关分析和频响函数对比,二者频率差异在2%以内,模态置信度(MAC)匹配值高于81%,由此验证了通过参考模型修正后的简化模型的正确性和有效性。使用本方法进行无实物样机的真实航空发动机的有限元建模,能提高计算精度和减小计算量,缩短研发周期。In order to solve the problem of finite element modeling accuracy of large and complex structures without prototype, finite element modeling, model updating and model validation were studied. First, by taking a simulated rotor as the research object, 5 kinds of finite element models with different mesh densities were established according to the geometry of the rotor. From Model 1 to Model 5, mesh densities were increased, and through calculating frequency differences of Model 1 to Model 4 with the most refined mesh Model 5, a reference model was determined. As the frequen- cy difference between Model 1 and Model 5 is less than 0. 6% , Model 1 can be used as a reference model. However, since the reference model mesh size is comparatively large, the model can not be used as a component model in the whole engine modeling and a simplified model of the rotor is need to be established. As the frequency error of the reference model and tested model is within 3%, the reference model can be used to update the simplified model. Finally, a correlation was analyzed and frequency response functions between the tested model and updated simplified model were com- pared. The frequency differences of them are in 2%, and matching values of modal assurance criterion are higher than 81%, which verified the correctness and effectiveness of the updated simplified model updated by the reference model. When this method is used to establish finite element model of a real aero-engine without physical prototype, the calculation accuracy can be improved and the amount of calculation can be reduced, also the period of research and development can be shortened.

关 键 词：航空发动机 模拟转子 有限元建模 模态试验 模型修正 

分 类 号：O241.82[理学—计算数学] V216.54[理学—数学]