路面随机不平度下车辆对路面的动载特性-交通运输工程学报-长安大学.pdfVIP

第7 卷　第6 期 交 通 运 输 工 程 学 报 Vol.7　No.6 2007 年12 月 Journal of Traffic and Transportation Engineering Dec.2007 :1671-1637(2007)06-0055-04 1 1, 2 1 吕彭民, 尤晋闽 , 和丽梅 (1. , 　710064; 2. , 　710049) 　:采用快速傅立叶逆变 法对路面随机不平度进行时域模拟, 建立二分之一车辆动力学模 型, 应用龙格-库塔法分析了路面等级、车速、载质量和车辆参数对路面动载荷的影响, 研究了车辆 产生的动载荷规律。仿真结果表明:车辆动载随着路面不平度的增大而明显增大;车辆动载和动载 系数随着车速的提高而增大, 且在固有频率附近会出现峰值;载质量的增加虽导致动载系数降低, 但动载增大, 故应严格限制超载现象;增大轮胎刚度和减小悬架阻尼都会引起车辆动载与动载系数 的增大, 因此, 应限制高压轮胎的使用和选择合理的车辆阻尼参数。 :路面工程;动载;路面不平度;数值仿真 :416.51　　　:A Vehicle dynamic load property resulted from road random roughness 1 1, 2 1 Lu Peng-min , You Jin-min , He Li-mei (1.Key Laboratory of Highway Construction Technology and Equipment of Ministry of Education, Chang an niversity, Xi an 710064, Shaanxi, China;2.School of Mechanical Engineering, Xi an Jiaotong niversity, Xian 710049, Shaanxi, China) Abstract:Road random roughness was simulated by using inversefast Fourier transform(IFFT)in time domain, a half-vehicle dynamics model was established, the effects of road grade, vehicle velocity, loading capacity and vehicle parameters on vehicle dynamic load were studied by Runge-Kutta method, and the rules of vehicle dynamicload caused by road roughness were studied.Simulation result indicates that vehicle dynamic load increases obviously with the intensification of road roughness;vehicle dynamic load and the dynamicload coefficient increasewith the increaseof vehicle speed, their peak values appear nearby inherent frequency;dynamic load coefficient decreases and vehicle dynamicload increases with the increase o