摘要
当前对于起落架低频刹车耦合振动问题的研究主要停留在纵向单自由度振动方面。建立双轮支柱式起落架多自由度低频刹车耦合振动多体动力学模型,在机身与主起落架连接处采用六自由度衬套模型模拟起落架支柱纵向、横向和扭转刚度及结构阻尼,对起落架纵向、横向以及扭转多自由度耦合振动特性进行分析。结果表明:低频刹车情况下起落架支柱刚度与刹车力矩幅值对于耦合振动的振幅、加速度、载荷影响较大;提高起落架结构刚度、阻尼、刹车力矩频率,减小刹车力矩幅值可以抑制起落架刹车耦合振动现象;双轮支柱式起落架左右机轮非对称刹车工况下,起落架会发生纵向、横向和扭转的多自由度耦合振动,并且随着非对称刹车力矩频率与幅值差距的增加,耦合振动现象加剧。
Currently,the research on the low frequency vibration coupled with brake problem of landing gear is focused on longitudinal single-degree-of-freedom coupling vibration.By establishing the multi-body dynamics model of multi-degree-of-freedom low-frequency brake-induced coupling vibration of the two-wheel telescopic landing gear,and stimulating the six-degree-of-freedom bushing model at the connection between the fuselage and the main landing gear to simulate the longitudinal,lateral and torsional stiffness and damping of the landing gear pillar,the multi-degree-of-freedom coupling vibration characteristics of the landing gear are analyzed in detail.The results show that the pillar stiffness and braking torque amplitude are of great influence on the amplitude,acceleration and load of coupled vibration under the condition of low frequency braking.The coupling vibration on the landing gear can be suppressed by increasing the structural stiffness,damping and braking torque frequency or reducing the braking torque amplitude.Under the condition of asymmetric brake of the left and right wheels of the landing gear,lateral and torsional coupling vibration of the landing gear occurs,and the coupling vibration is intensified with the extended gap between the frequency and amplitude of the asymmetric braking torque of the left and right wheels.
作者
陈帅
尹乔之
宋佳翼
魏小辉
张颂旸
CHEN Shuai;YIN Qiaozhi;SONG Jiayi;WEI Xiaohui;ZHANG Songyang(State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;Key Laboratory of Fundamental Science for National Defense Advanced Design Technology of Flight Vehicle,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《航空工程进展》
CSCD
2022年第5期69-77,94,共10页
Advances in Aeronautical Science and Engineering
基金
中国博士后科学基金资助项目(2021M691565)
航空科学基金(202000410520002)
国家自然科学基金(51905264)
中央高校基本科研业务费(NT2021004)
国防卓越青年基金(2018-JCJQ-ZQ-053)
江苏高校优势学科建设工程资助项目。
关键词
双轮起落架
多体动力学
耦合振动
低频
非对称刹车
landing gear with two wheels
multi-body dynamics
coupled vibration
low frequency
asymmetric brake
