摘要
为分析集中驱动式电动物流车质量比对车辆垂向性能的影响,基于某电动物流车整车动力学模型,以车辆动力电池和电机质量作为变量,采用均方根值和频域分析法,研究簧上与簧下部分质量比变化下车辆各垂向性能指标的变化趋势和质量匹配的有利区域,以及车轮相对动载荷和电机垂向振动的幅频特性。并在综合分析质量比与阻尼比和刚度比对整车垂向性能影响的基础上,提出集中驱动式电动物流车悬架阻尼比和刚度比的选取原则。研究表明,增大质量比能够有效的改善整车动态特性,但会加剧驱动电机的垂向振动,为电动物流车动力电池和电机质量的匹配设计以及悬架阻尼比和刚度比的选取提供指导。
In order to analyze the influence of mass ratio on the vertical performance of central-driven electric logistics vehicle, based on the dynamic model of an electric logistics vehicle, taking its power battery and motor mass as variables and using root-mean-squares (RMS) value and frequency domain analysis methods, we study the change trend of the vertical performance index of the vehicle, the favorable area of the quality match, the amplitude-frequency characteristics of the relative dynamic load of the wheel and the vertical vibration of the motor. On the basis of comprehensive analysis of the effects of mass ratios including damping ratio and stiffness ratio on the vertical performance of the vehicle, we present the selection principle of the suspension damping ratio and stiffness ratio of the central-driven electric logistics vehicle. The study results show that increasing the mass ratio can effectively improve the dynamic characteristics of the vehicle but aggravates the vertical vibration of its power motor, thus providing theoretical guidance for the matching design of power battery and motor mass and for the selection of suspension damping ratio and stiffness ratio of the electric logistics vehicle.
作者
吉志勇
王铁
李国兴
李蒙
Ji Zhiyong;Wang Tie;Li Guoxing;Li Meng(College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China)
出处
《机械科学与技术》
CSCD
北大核心
2019年第4期618-625,共8页
Mechanical Science and Technology for Aerospace Engineering
基金
山西省重点研发计划(重点)项目(201603D111007)资助
关键词
电动物流车
集中驱动
质量比
阻尼比
刚度比
动力学分析
electric logistics vehicle
centralized drive
mass ratio
damping ratio
stiffness ratio
dynamic analysis
