基于混合有限元模型的航空发动机主轴承剥落故障仿真分析方法  

A Spalling Fault Simulation Method of Aeroengine Main Bearing Based on Hybrid Finite Element Model

作　　者：吴英祥 尉询楷[2] 冯国全 赵紫豪 李伦绪 陈果[4] WU Ying-xiang;WEI Xun-kai;FENG Guo-quan;ZHAO Zi-hao;LI Lun-xu;CHEN Guo(AECC Shenyang Engine Research Institute,Shenyang 110015,China;Beijing Aviation Engineering and Technology Research Center,Beijing 100076,China;College of Civil Aviation,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;College of General Aviation and Flight,Nanjing University of Aeronautics and Astronautics,Liyang Jiangsu 213300,China)

机构地区：[1]中国航发沈阳发动机研究所,沈阳110015 [2]北京航空工程技术研究中心,北京100076 [3]南京航空航天大学民航学院,南京210016 [4]南京航空航天大学通用航空与飞行学院,江苏溧阳213300

出　　处：《航空发动机》2024年第3期79-86,共8页Aeroengine

基　　金：航空动力基础研究项目资助。

摘　　要：高保真的整机实体有限元模型可以逼真地反映航空发动机整机振动特性,但是难以考虑复杂的滚动轴承故障动力学模型,且其计算量太大,不能胜任主轴承故障激励下的整机非线性动力学仿真。为了有效地进行发动机主轴承的故障诊断,开展了主轴承剥落故障激励下的整机振动响应机理研究,提出了一种基于整机实体有限元模型和整机梁单元有限元模型的主轴承故障动力学混合仿真分析方法。利用整机梁单元模型仿真分析得到主轴承故障激励下与机匣相连接的主轴承支反力,在整机实体有限元模型中去除转子实体有限元模型,将支反力直接施加到各支承处的轴承座上,利用瞬态响应分析方法获取主轴承故障激励下的整机振动响应,并利用整机梁单元模型进行了方法验证。结果表明:利用混合有限元仿真方法获取了航空发动机主轴承故障激励下的仿真信号,误差均不超过1%,表明了所提出方法的正确有效性。A high-fidelity whole engine solid finite element model can realistically reflect the vibration characteristics of the aeroengine,however,it is difficult to take into account the complex dynamic model rolling element bearing fault,and its computational workload is too large to handle the whole engine nonlinear dynamic simulation under the excitation of main bearing spalling faults.In order to effectively diagnose main bearing faults,it is crucial to study the vibration response mechanism of the whole engine under the excitation of main bearing spalling faults.A hybrid simulation analysis method of main bearing fault dynamics based on solid finite element model and beam element finite element model was proposed.The support reaction forces of the main bearing connected to the casing were obtained by the simulation analysis of the whole engine beam element model,then,the rotor solid finite element model was removed from the whole engine solid finite element model,and the support reaction forces were directly applied to the bearing housing at each support,and the transient response analysis method was used to obtain the whole engine vibration response under the excitation of main bearing faults.Finally,the method was verified using the whole engine beam element model.The results show that the simulation signal under the excitation of main bearing faults can be obtained by using the hybrid finite element simulation method,with errors less than 1%,indicating the correctness and effectiveness of the proposed method.

关 键 词：主轴承 剥落故障 动力学仿真 有限元 航空发动机 

分 类 号：V229.2[航空宇航科学与技术—飞行器设计]