传动轴2阶激励下的车体低频抖动分析与控制  

Analysis and Control of Low-Frequency Shudder of Vehicle's Bodies under the Second Order Excitation of Drivelines

作　　者：罗轶超[1,2] 段龙杨 翁建生 吴赵生[1,2] 徐宜敏 LUO Yichao;DUAN Longyang;WENG Jiansheng;WU Zhaosheng;XU Yimin(Product Development Center,Jiangling Motors Co.Ltd.,Nanchang 330001,China;Key Laboratory of Automobile Noise and Vibration in Jiangxi Province,Nanchang 330001,China)

机构地区：[1]江铃汽车股份有限公司产品技术开发中心,南昌330001 [2]江西省汽车噪声与振动重点实验室,南昌330001

出　　处：《噪声与振动控制》2018年第2期71-76,共6页Noise and Vibration Control

摘　　要：传动系采用普通十字轴万向节连接的双段式传动轴时,车体在低档位急加速过程出现传动轴2阶激励下的低频抖动。根据普通十字轴万向节附加弯矩理论,推导双段式传动轴附加弯矩计算公式。通过分析抖动阶次特征、传动系与车体振动频率对应关系、传动系模态,揭示急加速整车低频抖动的产生机理,表明万向节产生的附加弯矩为该抖动的激励源。通过理论分析和实车调教试验研究中间传动轴节叉相位、传动轴扭矩、万向节夹角、传动轴中间支撑刚度对低频抖动影响,为解决低频抖动问题提出有效的优化措施。某车低档位急加速低频抖动严重,选用合理的优化措施后,低频抖动在空、满载工况下都达到了目标值。When using double-section driveline connected by universal joint(cardan joint),the low-frequency shudder of the vehicle’s body occurs under the second order excitation of the driveline due to the rapid acceleration at the low-speed gear.Based on the secondary couple theory of the single universal joint,the formula for secondary couple calculation of the double-section driveline is deduced.Through the analysis of vibration order characteristics,the relation between driveline frequency and body frequency and the modals of the driveline,the mechanism of the low-frequency shudder at the rapid acceleration is revealed.It is found that the secondary couple produced by the universal joint is the excitation source of the shudder.Through theoretical analysis and real vehicle test,the influences of the phase of the middle joint of the driveline,driveline torque,the angle at the universal joint,stiffness of the middle support of the driveline on the low-frequency shudder are analyzed.Finally,some optimal measures for suppressing the shudders are proposed and applied to a vehicle’s body and its low-frequency shudder at low speed gear is found to be below the acceptable value.

关 键 词：振动与波 急加速 低频抖动 普通万向节 附加弯矩 传动轴2阶 

分 类 号：TB533[理学—物理]