子午线轮胎静态接触三维非线性有限元分析

采用三维实体单元对195／60R14规格子午线轮胎进行了三维非线性有限元分析，考虑了轮胎的几何非线性、材料非线性、橡胶-帘线复合材料的各向异性、轮胎与轮毂过盈配合以及轮胎接触非线性，给出了轮胎与地面接触过程中轮胎的变形情况、接触区形状变化、接触压力分布、载荷-变形关系等结果，对轮胎的设计和改进具有一定的指导意义。     

半刚性基层沥青混凝土路面反射裂缝模拟试验及有限元分析

通过气动伺服诺丁汉沥青材料试验仪 NU- 14研究不同沥青材料及不同防裂措施的抗疲劳能力 ,采用有限单元法计算沥青混凝土面层荷载应力和温度应力 ,分析了反射裂缝的产生机理和不同防裂措施的作用机理     

摩托车排放控制及催化转化器应用技术

对于大多数车型来说,进气系统应对欧Ⅱ的主要工作还是优化化油器,其他改进方式有电控化油器和电控燃料喷射技术。另外,国内还有向进气管补充空气的技术,对于排放的效果也很明显,但对整车的操控性能有一定的影响。     

电控可调涡轮增压天然气发动机开发

将一台CA488汽油机改造为电控可调涡轮增压天然气发动机。该发动机采用了电控多点燃气顺序喷射技术、电控高能点火技术、可调喷嘴涡轮增压技术及中冷技术。试验研究表明，采用可调喷嘴涡轮增压技术可提高发动机的进气量，优化增压器在全工况范围内与发动机的匹配，大幅度提高发动机的动力性与经济性：增压后天然气发动机的最大功率与原汽油机相当，低速转矩特性明显改善，同时发动机使用经济性也得到提高。     

CAE技术在汽车翼子板拉延模具设计中的应用

介绍了板料成型CAE软件CADEM主要理论，并以汽车外覆盖件翼子板的拉延模具开发为例，阐明了CAE技术在模具开发中所起的重要作用：通过应用仿真软件CADEM，模拟在给定冲压工艺条件下板料成型的全过程，准确预测可能出现的缺陷。     

弯斜桥梁的几何设计

弯斜桥梁的几何设计思路是影响设计、施工的重要因素。文章针对几种常见弯斜桥梁的结构特点 ,通过采用不同的平面布置形式 ,达到设计简单、施工方便、降低工程造价的目的     

金属冷锻破裂的预测

系统地分析了冷锻件破裂的原因，提出了提高冷锻件质量的方案，研究了不同热处理状态下镦粗的极限应变。考虑到静水压应力分量具有抑制材料韧性破坏的重要特性，从能量观点出发提出了冷锻材料破裂准则。试验验证结果表明，该准则可用于金属冷锻成型的破裂预测，并可指导冷锻成型工艺的编制及模具的调试。     

自动变速器测试试验台的研究

对现有变速器的故障诊断和对修复后的变速器进行全面检测,是自动变速器使用中保持良好工作的重要保障。论述了轿车自动变速器测试试验台性能测试系统的软硬件结构。     

关于道路运输企业运输质量评价指标体系的思考

对现有道路运输质量评价指标体系进行了分析,提出了改进道路运输质量评价指标体系的设想和建议。     

Application of Auction Algorithm for Shortest Paths to Traffic Assignment

Auction algorithm is a new and simple algorithm for finding shortest paths in a directed graph proposed by Prof. Bertsekas, whose application has been extended to solve a variety of linear network flow problems. In this paper, auction algorithm for shortest paths is introduced and its characteristics are analyzed. The paper compares the auction algorithm with other algorithms widely used such as label-setting algorithm and label-correcting algorithm. The auction algorithm is particularly applicable to parallel computation and to the solution of a large-scale sparse network, which precisely meets the requirements of the traffic assignment. The algorithm is easy to program. Through a variety of measures the basic algorithm can be improved and speeded up and the computation speed can be increased by several times. The auction algorithm can be adopted in various traffic assignment methods. It can be used efficiently in the case of multiple origins and a single destination, and a single origin and multiple destinations. Different origin sets and destination sets are determined in accordance with the requirement of the traffic assignment. It is not required any more to find the shortest paths connecting any node pairs, so a lot of computation can be avoided and the computing time can be reduced by the use of the auction algorithm in the traffic assignment. Auction algorithms can thus be broadly applied in the transportation fields.