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类型 基础研究 预答辩日期 2017-11-29
开始(开题)日期 2016-03-21 论文结束日期 2017-09-15
地点 道桥实验室二楼会议室 论文选题来源 国家自然科学基金项目     论文字数 6.1 (万字)
题目 基于路面宏观纹理的轮胎抗滑行为数值模拟研究
主题词 流固耦合,轮胎滑水,子午线轮胎,橡胶材料摩擦模型,附着系数
摘要 交通安全问题历来是整个交通行业面临的共同难题,雨天事故多发则是研究的一大热点。通过对雨天交通事故的调查分析可知,道路交通雨天事故大多与路面抗滑能力下降有关。对于汽车高速通过潮湿路面,路面积水受到高速冲击,由此产生的托举力使得轮胎与路面分离,整车行驶稳定性下降,在遇到紧急制动更易引起水漂而发生交通事故,因此要求道路路面雨天也应提供良好的抗滑性能以保证行车安全。论文根据有限元理论和流固耦合理论建立了轮胎-流体-路面有限元模型,提出了采用模拟手段研究轮胎滑水这一过程的有效方法。 首先,建立了具有表面宏观纹理的沥青路面模型:通过三维光学扫描,获取沥青混合料表面宏观纹理的几何信息,编写MATLAB程序计算沥青路面的平均断面深度,利用CT扫描技术,依据三维重构原理进行试件的有限元建模,解决了沥青路面复杂宏观纹理建模的工作。 其次,建立了复杂花纹的子午线轮胎有限元模型:进行轮胎材料拉伸试验,使用YEOH模型模拟橡胶材料的超弹特性,采用遗传基因模型形式来描述橡胶材料的粘弹性,利用加强筋单元模拟轮胎各向异性的力学特性。通过轮胎充气和径向刚度模拟试验验证了所建轮胎模型适用于滑水分析。 再次,依据Persson摩擦理论建立了轮胎橡胶材料-路面的摩擦模型:针对沥青路面表面纹理的分形特征,采用分段变维分形的方法,计算了沥青路面的功率谱,结合橡胶材料的粘弹特性,建立了橡胶材料摩擦模型,编写ABAQUS摩擦子程序FRIC,分析了静载状态和ABS状态下的轮胎接地的接触压应力分布和接地面积随充气内压和轮胎荷载变化的规律,并进行对比分析,指出建立橡胶材料摩擦模型的必要性。 然后,依据流固耦合理论,采用欧拉单元建立了流体模型:采用液面追踪技术模拟了流体的自由液面,推导了水流的状态控制方程,研究了流固耦合类型,依据计算要求设定流体边界条件。 最后,将轮胎模型、流体模型、沥青路面模型三者耦合计算,分析了轮胎充气内压、水膜厚度、沥青路面宏观纹理对轮胎滑水的影响,发现:较高的轮胎充气内压可以有效的提高轮胎的滑水速度,轮胎滑水速度的增幅随路面水膜厚度的增加而减小;优良的表面宏观纹理构造能显著的提高轮胎的滑水速度,工况相同的情况下,OGFC路面拥有最高的轮胎滑水速度。轮胎的附着系数随着沥青路面MPD值的增加而增加,随着轮胎速度的增加而减小,工况相同的情况下,OGFC路面拥有最高的附着系数,其次为SMA路面,AC路面最低。相同水膜厚度,随着速度的增加,开级配设计的OGFC路面比其他级配设计的沥青路面具有更好的防滑性能。 根据本文研究结算的成果,可以实现对不同配合比设计的沥青路面,不同工况下的轮胎滑水性能的预估,对新建路面的配合比设计和现有路面的再生级配设计均具有一定的指导意义。
英文题目 NUMERICAL STUDY OF TIRE SKID RESISTANCE BASED ON PAVEMENT MACRO-TEXTURE
英文主题词 solid-fluid coupling, tire hydroplaning, radial tire, friction model of rubber material, friction of coefficient
英文摘要 As a common difficulty faced by the entire transportation industry, traffic safety problem, especially frequent occurrence of vehicle accidents in rainy days has been a hot topic in recent research. Through the investigation and analysis of these accidents, it is determined that they are closely related to the deterioration of pavement skid resistance. When tire rolls on flooded asphalt pavement with high speed, lift force caused by hydrodynamic pressure breaks the contact between tire and pavement, which threats vehicle driving stability and lead to tire hydroplaning. Thus it is required that the pavement should provide favorable skid resistance to ensure traffic safety. In this paper, finite element model of tire-fluid-pavement was built based on finite element method and fluid-solid coupling theory, and it is determined that numerical simulation is a useful tool in the research of tire hydroplaning. In the first place, virtual asphalt pavement model with macro-texture surface was established. In this process, Three-dimensional optical scanner (3DS) was used to acquire the three-dimensional topography of the slab specimens. Then the mean profile depth (MPD) values were calculated in MATLAB. In order to acquire the three dimensional space structure of asphalt pavement, industrial computerized tomography and digital image processing technique were used. Thus the modelling work of asphalt pavement with complex surface texture was accomplished. Then, three dimensional FE model of radial tire with complex pattern was established in ABAQUS. YEOH model was applied to describe the super-elastic mechanical property determined by tensile test on tire tread rubber material. Genetic model and rebar element were used respectively to describe the viscoelasticity of rubber material and anisotropic property of skeleton material in tire. Then virtual tire inflation test and radial stiffness test were conducted to valid the tire model used for hydroplaning analysis. Then the rubber-pavement friction model was deduced based on persson’s friction theory. According the fractal features of asphalt pavement, pavement power spectrum was measured adopting segmented variable dimension fractal method. Combining the complex modulus of tire rubber, rubber-pavement friction model was determined. Then a friction subroutine (FRIC) was written in ABAQUS. After that, contact stress distribution and contact area at tire-pavement interface were analyzed. The comparison pointed out the necessity to establish the rubber-pavement friction model. Fluid model was established by Euler element based on fluid-solid coupling theory. Liquid level tracking technique was applied to simulate the free surface of the fluid. In this process, state equation of water was deduced and the type of fluid-solid coupling was determined, as long as the boundary condition of the fluid model. Based on the established tire-fluid-pavement model, the influence of tire inflation pressure, water film thickness, and asphalt pavement surface macro-texture on tire hydroplaning was analyzed. It was discovered that initial tire inflation pressure has a positive influence on improving skid resistance of flooded pavement. Thicker water film on the pavement leads to smaller critical hydroplaning speed. Abundant surface macro-texture was favorable to increase the critical tire hydroplaning speed. Within the same working condition, OGFC owns the highest tire hydroplaning speed. It was determined that the wet coefficient of friction increases with the enlargement of MPD value and the decrease of tire moving speed. Within the same working condition, OGFC owns the highest tire hydroplaning speed, superior than SMA and AC pavement. With the same water film thickness, the skid resistance of OGFC with open graded design is much better than other asphalt, which was more obvious with the increase of tire moving speed. Based on the research results in this paper, the tire hydroplaning performance on asphalt pavement with different mixture ratio design under different conditions can be predicted. It provided a significant tool in supervising the mixture design of new pavement and recycling pavement.
学术讨论
主办单位时间地点报告人报告主题
交通学院 2016-09-15 道桥试验室二楼会议室 程永振 Field and Numerical investigation of soil- atmosphere interaction at Nairobi, Kenya
交通学院 2015-08-23 道桥试验室二楼会议室 李凌林 沥青路面长大纵坡段车辙性能研究
交通学院 2016-12-06 道桥试验室二楼会议室 唐皓 东非黑棉土的膨胀特性及处治技术研究
交通学院 2016-12-26 道桥试验室二楼会议室 郭辉 基于多参数描述的沥青混合料构成研究
交通学院 2014-10-29 道桥试验室二楼会议室 朱晟泽 轮胎滚动阻力研究
交通学院 2015-08-28 道桥试验室二楼会议室 朱晟泽 沥青路面抗滑需求与养护对策
交通学院 2015-12-15 道桥试验室二楼会议室 朱晟泽 横向刻槽混凝土路面轮胎滑水速度的数值模拟研究
交通学院 2017-05-15 道桥试验室二楼会议室 朱晟泽 Numerical Study of Tire Hydroplaning
     
学术会议
会议名称时间地点本人报告本人报告题目
10th International Conference on Road and Airfield Pavement Technology 2017-08-08 香港理工大学 Evaluation of Pavement Skid Resistance Based on Tire Hydroplaning Analysis and Vehicle Braking Distance Calculation
第四届中欧功能性路面设计研讨会 2016-06-29 荷兰代尔夫特 Analysis of Effects of High Temperature and Heavy Traffic Loads on Anti-rutting Performance of Gravel Asphalt Concrete Mixtures
     
代表作
论文名称
Numerical Study of Tire Hydroplaning Based on PowerSpectrum of Asphalt Pavement and Kinetic Friction
Numerical simulation of tire hydroplaning speed on transverse grooved concrete pavements
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
杨军 正高 教授 博导 东南大学
曹荣吉 正高 教授级高工 其他 苏交科集团股份有限公司
赵永利 正高 教授 博导 东南大学
许涛 正高 教授 博导 南京林业大学
马涛 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
徐光霁 其他 讲师 东南大学