【作者】 王少赠；

【导师】 刘晶郁；

【作者基本信息】 长安大学 ， 车辆工程， 2007， 硕士

【摘要】 车辆与路面相互作用的动力学问题是一个新的科学分支,它主要研究车辆、道路以及它们之间的相互作用的动力学问题,是现阶段车辆工程和路面工程领域研究的薄弱环节。论文将车辆与路面二者结合起来,应用随机振动理论和优化设计理论对重型车辆动态荷载作用下车辆—路面之间的作用关系进行系统的研究,在理论上揭示二者之间的内在联系和作用规律,对路面结构设计和重型车辆设计具有重要的现实意义。论文系统分析研究了国内外现行道路损伤的评价指标,指出了现行指标的不足之处,结合我国道路运输的具体情况对国外单部车辆通过时的基于疲劳断裂理论的道路疲劳破坏评价指标进行了完善,得到更为科学的路面使用寿命计算方法;论文建立了二分之一车辆振动模型,在频域内对影响车轮动载荷的因素进行了系统分析,得到了车速、路面不平度、车辆主要结构参数对路面动载荷的定量影响;通过建立的不同车速的路面时域模型、线性2轴汽车虚拟样机模型,计算分析得到了满载、超载达到额定载荷120%时的车轮动载荷的变化规律,并由道路疲劳破坏评价指标计算得到某段公路在2轴车辆动载荷下10%疲劳破坏时应变循环次数,研究结果表明当研究车辆超载达到额定载荷120%时,路面的使用寿命将会降低到原来的30%～60%;论文从减轻路面损伤和不降低原车平顺性的角度运用优化设计理论对重型汽车悬架系统进行了优化分析计算,优化结果表明,重型汽车对道路损伤的一个主要原因是后悬架阻尼太小,轮胎动载荷较大,因此,增加喝?茏枘崾且桓黾跣≈匦统盗径月访嫠鹕说挠行Т胧更多还原

【Abstract】 Vehicle-roads interaction dynamics is a new scientific branch. It mainly deals with three main parts: vehicle, road and dynamic problem of their interactions. Of the three parts, the study on the last one is still weak in vehicle engineering and road surface engineering fields. Papers combine both the road and vehicles and conducted systematically study on the inter-relationship between heavy duty vehicles and road under dynamic loads with random vibration theory and the theory of optimal design. Furthermore, the paper theoretically reveals the inter-relationship and inter-action law, which has a great practical significance for the road surface structure designing and heavy-duty vehicles designing.Papers systematically analyzed the existing evaluation index of road damage then pointed out its shortages. Considering the details of China’s road transportation, this paper improved the abroad road fatigue) damage evaluation index based on SAE1993. Then, a more scientific calculation method road for calculating road surface life was obtained. This paper established a half vibration model of vehicles to systematically analyze the factors which impact the wheel dynamic load in frequency domain and obtained the quantitative impact to road surface which comes from vehicle speed, road roughness and the major structural parameters of vehicles. This paper established the roads time domain model for different speed and the linear virtual prototype model for two-axis vehicle to obtain the change rules of wheels dynamic load for full-load and 120% overloaded vehicles by calculation. Furthermore, the strain cycle-index of a section of a certain highway under 10% fatigue damage by the dynamic load of a two-axle vehicle was obtained through the road fatigue damage evaluation index. The results show that road surface life will be reduced to 30%～60% of the original when the vehicle overloading 120%. Paper optimized the suspension system of heavy vehicles by using optimization designing theory from two aspects: one is to reduce the road surface damage, the other is not to reduce original smoothness.The results show that one of the main reasons which make heavy vehicle damage to roads is that the suspension damping is too small and that tires dynamic load is larger. Thus, increasing the suspension damping is an effective measure to reduce the road surface damage resulted in heavy vehicles.更多还原