国家自然科学基金重点项目 高速、.ppt
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1、(一)轮轨型面和材料优化匹配(车辆稳定性) (二)轮轨滚动接触疲劳和磨损(波磨) (三)轮轨粘着和材料强度 (四)脱轨 (五)轮轨滚动接触噪声 (六)滚动接触基本理论,轮轨关系问题的研究,蛇形运行条件下轨枕间距对直线钢轨波磨形成的影响,金学松 大连交通大学 交通运输工程学院西南交通大学 牵引动力国家重点实验室2007. 1. 17,1. Introduction,R. A. Clark (British, 1980s),R. A. Clark P. A. Dean J. A. Elkins S. G. Newton,Journal of Mechanics Engineering Scienc
2、e 24(1982),Rail,Sleeper,直线压痕波磨,电车直线轨道波磨,欧洲高速线上短波波磨,广深高速线长波长波磨,S. L. Grassie J. Kalousek,Proc. Institution of Mechanical Engineers 207 (Part F), 1993,Such a type of corrugations was referred to as roaring rail corrugation, and attributed to wear mechanism and the concerned factors including vertical
3、dynamical loads, the creepages between wheel and rail. Usually, the misalignment and rolling-slip of wheelsets occur when the wheelsets hunting a tangent track, the lateral and longitudinal creepages between the wheels and rails become larger. It can be predicted that the larger conformity and conta
4、ct angle between wheel and rail leads to the larger spin creepage and the severe wear between them.,D. K. Ahlbeck L. E. Daniels,Proc. 1990 ASME Joint Railroad Conference,Transit/Passenger corrugations show characteristic grouping in their development. These short wavelength corrugations mainly group
5、ed in the second half sleeper bay and near the peak of wheelset kinematical hunting.,Normal Load Fluctuating,Creepage Fluctuating,Constant Normal Load,Constant Creepage,Corrugationdue to Plastic Deformation,Basic Factors AffectingRail Corrugation Initiation,Corrugationdue to Material Wear,2. Corruga
6、tion Model,2.1 Model of Passenger Car and Track (Before),(b) Elevation,(a) Side Elevation,Model of Passenger Car and Track (Now),(a) Side Elevation,(b) Elevation,Improvement 1: Vertical Bending Restricted by Fastening Systems,Improvement 2: Backward Moving of Fastening System,The two ends hinged,Ind
7、ependent Second Partial Equations for Beam in Vertical, Lateral and Torsional Directions,Backward MovingCoordinates of Sleepers,Equivalent Loads on Rail,Fastening System,Force Diagram of Rail,基本思想,2.2 Model of Rolling Contact,Mesh Size: 0.80.8 mm2,2.3 Model of Rail Material Wear,2.4 Contact Model of
8、 Wheel and Rail,Model for Normal Load:,CH =1.131011 N/m (Hertzian Contact Spring Coefficient),Zwnk, Zrnk The Normal Distance of Wheel and Rail,0 The Normal Approach of Wheel and Rail,Uw The Depth of Undulatory Wear,Model for Tangent Load: Creep Force Model by Shen et al,2.5 Contact Geometry of Wheel
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