微转速差双转子系统对自动液力变速器车型怠速抽动的影响研究  

Study on the Influence of Dual-Rotor System with Micro-Speed Difference on Idle Vibration of AT Vehicle

作　　者：李兴泉 付江华[2] 贾小利 邓仁伟 李宏成 魏宏杰 Li Xingquan;Fu Jianghua;Jia Xiaoli;Deng Renwei;Li Hongcheng;Wei Hongjie(Chang’an Auto Global R&D Center,Chongqing Chang’an Automobile Co.,Ltd.,Chongqing 401120;Chongqing University of Technology,Chongqing 400054;Chongqing Jiaotong University,Chongqing 400074)

机构地区：[1]重庆长安汽车股份有限公司汽车工程研究总院,重庆401120 [2]重庆理工大学,重庆400054 [3]重庆交通大学,重庆400074

出　　处：《汽车工程师》2024年第9期8-12,20,共6页Automotive Engineer

摘　　要：为分析液力变矩器与曲轴组成的微转速差双转子系统对自动液力变速器(AT)车型怠速抽动的影响,通过对双转子系统动不平衡耦合激励力进行希尔伯特变换(Hilbert Transform),揭示出部件拍振是导致有规律怠速抽动的根本原因,其抽动激励幅值最大值为激励力之和,抽动间隔频率为激励力频率之差。建立包括发动机、变速器、悬置等系统的机械系统动力学自动分析(ADAMS)模型并进行仿真,结果表明,动力总成垂向刚体模态频率与激励频率越接近,液压悬置垂向一阶动刚度越大,振动幅值越大。因此,可通过动力总成Z向模态频率与曲轴动不平衡激励频率间的避频设计、降低液压悬置垂向动刚度、提高悬置系统的隔振性能等方式改善怠速抽动。The micro-speed difference dual-rotor system composed of a hydraulic torque converter and a crankshaft affects the idle twitch of an Automatic Transmission(AT)vehicle.Through the Hilbert transform of the dynamic unbalanced coupling excitation force of the dual-rotor system,it is revealed that the beat vibration of the component is the root cause of the regular idle twitch.The maximum twitch amplitude is the sum of the excitation forces,and the twitch time interval is the difference between the excitation force frequencies.The Automatic Dynamic Analysis of Mechanical Systems(ADAMS)model including engine,transmission and mounting system is established and simulated.The results show that the closer the vertical rigid body mode of the powertrain is to the excitation frequency,the greater the vertical first-order dynamic stiffness of the hydraulic mount and the greater the vibration amplitude.Therefore,the idle twitch can be improved by the frequency avoidance design of the Z-direction mode of the powertrain and the dynamic unbalance excitation frequency of the crankshaft,reducing the vertical dynamic stiffness of the hydraulic mount,and improving the vibration isolation performance of the mount system.

关 键 词：微转速差双转子系统 自动变速器 怠速 抽动 液力变矩器 发动机 

分 类 号：U463.22[机械工程—车辆工程]