摘要
动力系统扭振问题是增程式电动汽车NVH领域研究的热点和难点。为了探讨增程器机电耦合作用下的扭振特性,以某款柴油机增程器为研究对象,对轴系进行系统当量化,建立了8自由度轴系扭振动力学模型,并采用非接触式测量方法在增程器台架上进行扭振试验验证了模型的准确性。讨论了轴系结构参数、电磁参数以及激励力矩的获取方法,对增程器轴系进行了解耦计算并与原机进行对比分析得出电机转子系统的加入使轴系固有频率降低了27.6 Hz,最大振幅降低约21%,共振转速在原机的基础上整体向前推移了约200 r/min,且在前12阶内会增加一个固有频率。并根据增程器工况的特殊性重点分析了电磁参数对轴系的扭振特性影响,结果表明电磁阻尼与扭振振幅呈线性负相关,但其并不改变轴系的固有频率和共振转速;电磁刚度对扭振振幅影响不明显,主要影响零频的大小,会导致轴系出现低频滚振现象。
Torsional vibration of power system is a hot and difficult problem in NVH field of extended range electric vehicles.In order to investigate the torsional vibration characteristics of the range extender under elec-tromechanical coupling,taking a diesel engine range extender as the research object,systematic quantification of the shaft system is carried out and a torsional vibration mechanical model of the eight-degree-of-freedom shafting sys-tem is established.A non-contact measurement method is used to conduct torsional vibration tests on the range ex-tender platform to verify the accuracy of the model.The method of obtaining shafting structure parameters,electro-magnetic parameters and excitation torque is discussed.The coupling calculation of the range-extender shafting is carried out and the comparison analysis with the original machine is made.It is concluded that the addition of the motor rotor system will reduce the natural frequency of shafting by 27.6Hz and the maximum amplitude by about 21%.The resonant speed is shifted forward by about 200 r/min on the basis of the original machine,and a natural frequency is increased in the first 12 steps.The influence of electromagnetic parameters on torsional vibration char-acteristics of shafting is analyzed according to the particularity of range extender working condition.The results show that the electromagnetic damping is linearly and negatively correlated with torsional vibration amplitude,but it does not change the natural frequency and resonant speed of shafting.The electromagnetic stiffness has no obvious effect on the amplitude of torsional vibration,and mainly affects the size of zero frequency,which will lead to low frequen-rolling vibration of shafting.
作者
雷基林
杨雄专
王伟超
邱越
杨钊乾
毕玉华
莫瑞
Lei Jilin;Yang Xiongzhuan;Wang Weichao;Qiu Yue;Yang Zhaoqian;Bi Yuhua;Mo Rui(Kunming University of Science and Technology,Yunnan Key Laboratory of Internal Combustion Engine,Kunming 650500;Kunming Yunnei Power Co.,Ltd.,Kunming 650500)
出处
《汽车工程》
北大核心
2025年第2期281-291,共11页
Automotive Engineering
基金
云南省省市一体化专项项目(202202AC080004)
云南省重大科技专项计划项目(202302AE090052)资助。
关键词
增程器
扭转振动
机电耦合
动力学
range extender
torsional vibration
electromechanical coupling
dynamics
作者简介
通信作者:雷基林,教授,博士,E-mail:leijilin@sina.com。
