考虑粗糙表面接触配合的航空发动机多级转子装配误差传递建模  

Modeling of Error Transfer in Multistage Rotors Assembly of Aero Engine Considering Rough Surface Contact

作　　者：石嵩 刘检华[1,2] 巩浩[1,2] 邵楠 SHI Song;LIU Jianhua;GONG Hao;SHAO Nan(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081;Tangshan Research Institute,Beijing Institute of Technology,Tangshan 063015)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京理工大学唐山研究院,唐山063015

出　　处：《机械工程学报》2023年第17期208-219,共12页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(52105503,51935003)。

摘　　要：传统的转子系统装配建模方法忽略了转子粗糙表面微观形貌的影响,可能导致装配误差传递建模和优化不精确等问题,在此背景下,提出了一种综合考虑定向误差、定位误差和表面粗糙形貌的航空发动机多级转子装配误差传递分析方法。首先,使用共轭梯度法模拟转子端面的粗糙表面微观形貌,在刚性接触假设下,提出了一种考虑平移、单点和轴线旋转,以及质心作用的接触求解算法,计算两个粗糙表面的装配倾斜角和配合面方程。然后,改进传统基于齐次变换矩阵的装配误差传递模型,建立了考虑粗糙表面接触配合的多级转子装配同轴度误差传递模型。最后,以航空发动机转子模拟件为对象,选取前轴和第一级盘进行实例分析,新模型的同轴度预测精度与传统模型相比提高了11.55%。研究结果表明,所提方法可以提高航空发动机多级转子装配精度预测的准确性,为航空发动机转子系统的精密装配提供了理论依据。Traditional assembly modeling methods for rotor system ignore the influence of the rough surface micro-morphology of rotors,which may lead to inaccurate assembly error propagation modeling and optimization.Hence,an error propagation analysis method of aero-engine multistage rotors assembly is proposed,which comprehensively considers location errors,orientation errors,and rough surface morphology.First,the conjugate gradient method is used to simulate the practical rough surface micro-morphology of the rotor end face.Then,a contact solution algorithm is proposed under the assumption of rigid contact to calculate the equation of the mating surface and the assembly tilt angle after the mating of two rough surfaces.Second,the traditional homogeneous transformation matrix model for assembly error is improved,and a coaxiality error propagation model considering the rough surface morphology of multistage rotors assembly is established.Finally,the front shaft and the first stage disc of the aero-engine are selected as the objects to verify the effectiveness of the precision prediction model,the accuracy of coaxiality prediction using the new model improved 11.55%compared to the traditional model.The research results indicate that the proposed method can improve the precision prediction accuracy of aero-engine multistage rotors assembly,and provide a theoretical basis for the precision assembly of aero-enginerotorsystem.

关 键 词：航空发动机 转子装配 粗糙表面形貌 误差传递 同轴度 

分 类 号：TG156[金属学及工艺—热处理]