Study on modal characteristics and vibration reduction of an aircraft rotor–stator brake-induced squeal system  

作　　者：Qiaozhi Yin Xiaohui Wei Hong Nie Jian Deng 

机构地区：[1]State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [2]Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China [3]Nanjing Center for Multifunctional Lightweight Materials and Structures,Nanjing University of Aeronautics and Astronautics,Nanjing,210016,China

出　　处：《Acta Mechanica Sinica》2020年第6期1350-1359,I0004,共11页力学学报（英文版）

基　　金：This study was funded by the National Natural Science Foundation of China(Grant 51905264);the China Postdoctoral Science Foundation Funded Project(Grants 2019M650115,2019M661818 and 2020T130298);the National Defense Outstanding Youth Science Foundation(Grant 2018-JCJQ-ZQ-053);the Fundamental Research Funds for the Central Universities(Grant NF2O18OO1)and the Priority Academic Program Development of Jiangsu Higher Education Institutions.

摘　　要：Based on the modal coupling theory,the rotor and stator contact stiffness and axial relative velocity are considered to build an electric aircraft brake dynamic system model in this study.Both the complex modal analysis and transient dynamic analysis methods are used to study the aircraft brake squeal performance and vibratory mechanism.The unstable vibration modes indicate that the out-of-plane vibration plays an important role and the feed-in energy is larger than the output energy in the brake rotor–stator module so that brake squeal takes place.Then the influences of the contact stiffness,friction damping and frictional coefficient on the brake squeal system are carried out,laying the foundation for the three proposed vibration suppression methods.Results show that the coefficient negative-slope condition will intensify the vibration.Also,a linear relationship between the squeal factor and the frictional coefficient is obtained to provide a guidance to predict squeal stability under more conditions.Vibration reduction design shows that adding a damping layer to the brake mechanism and chamfering the edge of braking stators both can reduce brake squeal effectively,while slotting braking stators is invalid in aircraft braking system.

关 键 词：Aircraft rotor-stator bake-induced vibration Brake squeal-Vibration stability Modal coupling Vibration suppression 

分 类 号：V22[航空宇航科学与技术—飞行器设计]