摘要
某乘用车搭载1.5 T四缸发动机,匹配湿式双离合(Wet Double Clutch Transmission,WDCT)变速箱,在NVH调校时,系统会在发动机启动工况或发动机转速下降至450 r/min左右时产生共振,且共振持续时间长,整车抖动严重。通过研究分析确定该问题是由于双质量飞轮的低刚度致使发动机转速与整车动力传动系统的共振频率耦合导致。为进一步解决该共振问题,采集此整车共振工况下的转速波动信号。基于AMESim软件搭建双质量飞轮的多自由度动力学仿真模型和模态分析模型,通过仿真分析确定双质量飞轮的初次级飞轮转动惯量、扭转刚度、基础阻尼力矩及自由转角对发动机扭振衰减效果的影响,得到共振问题的解决方案并进行试验验证。结果表明,减小弹簧刚度、增大基础阻尼力矩以及优化初次级飞轮的惯量可以有效降低双质量飞轮的共振转速和共振振幅,提升整车的NVH特性。
A passenger car is equipped with a 1.5 T four-cylinder engine and is matched with a wet dual-clutch gearbox(WDCT).During the NVH adjustment process,the system will resonate in the condition of starting,or when the engine speed drops to about 450 r/min,and the resonance will last for a long time and the whole vehicle will shake seriously.Through research and analysis,it is founded that the problem is caused by the coupling between the engine speed and the resonance frequency of the vehicle power transmission system due to the low stiffness of the dual-mass flywheel.In order to solve the resonance problem,the rotational speed fluctuation signal is collected under the resonance condition of the whole vehicle.Based on AMESim software,a multi-degree-of-freedom dynamic simulation model of the dual mass flywheel is built.The effects of the primary and secondary flywheel rotational inertia,torsional stiffness,basic damping moment and free rotational angle of the dual-mass flywheel on the engine torsional vibration attenuation are analyzed.The solution of the resonance problem is obtained and verified by tests.It is indicated that the resonance speed and amplitude of the dual mass flywheel can be reduced and the NVH characteristics of the vehicle can be improved by reduction of the spring stiffness,increment of the basic damping torque and the optimization of the inertia of the primary and secondary flywheels.
作者
张贵辉
石磊
陈闯
李健
马俊明
张忠仁
ZHANG Guihui;SHI Lei;CHEN Chuang;LI Jian;MA Junming;ZHANG Zhongren(Jilin Dahua Machine Manufacturing Co.,Ltd.,Changchun 130103,China)
出处
《噪声与振动控制》
CSCD
北大核心
2023年第6期190-195,共6页
Noise and Vibration Control