TMCP船用钢材应用性能的研究

文章针对TMCP船用AH36高强钢的材料性能进行了研究。试验用钢材的板厚为19．5mm的AH36（TMR）和AH36（AcC）。通过化学分析等方法,对材料的力学性能、组织、最高硬度等方面进行了较为全面的分析。结论显示两种材料均具有高强度、高韧性的特点。并对TMCP材料采用CO2半自动焊和FAB自动焊接方法进行了试验,结果表明材料具有良好的焊接性能。     

子午线轮胎滚动阻力的数值模拟

利用MSC．MARC软件对子午线轮胎的滚动阻力进行了三维有限元分析计算,对轮胎的胎体、带束层、胎圈等部位采用了rebar膜单元以及rebar实体单元进行模拟,采用Yeoh材料模式描述橡胶材料,对特定的子午胎在不同负荷、不同速度下的滚动阻力进行了预测,并将预测结果与实测值进行了比较。     

集装箱船舶的船长应充分注意船舶稳性

本文针对集装箱船舶的驾驶人员在生产实践中就船舶稳性方面可能出现的问题进行了探讨,提出了解决的办法,提请集装箱船舶的船长们注意,以利船员和船舶的安全     

The optimal dispatching of taxis under congestion: A rolling horizon approach

Taxis make an important contribution to transport in many parts of the world, offering demand‐responsive, door‐to‐door transport. In larger cities, taxis may be hailed on‐street or taken from taxi ranks. Elsewhere, taxis are usually ordered by phone. The objective of a taxi dispatcher is to maximize the efficiency of fleet utilization. While the spatial and temporal distribution of taxi requests has in general a high degree of predictability, real time traffic congestion information can be collected and disseminated to taxis by communication technologies. The efficiency of taxi dispatching may be significantly improved through the anticipation of future requests and traffic conditions. A rolling horizon approach to the optimisation of taxi dispatching is formulated, which takes the stochastic and dynamic nature of the problem into account. Numerical experiments are presented to illustrate the performances of the heuristics, taking the time dependency of travel times and passenger arrivals into account.     

抛石强夯与蓝派冲击压实在填海路基工程中的应用

本文研究了点夯、蓝派冲击式压实机的工作原理,结合工程实例,软基处理环境复杂,施工技术要求高,难度大等特点,阐述了该工艺的施工原理、施工方法、质量控制措施,并对该工艺的优点进行了总结,此方案的实施对填海路基的实际施工具有重要的指导性意义。     

屏蔽门安装位置与列车停车点的关系探讨

本文介绍了车辆系统与车载信号系统的电气接口及其控制原理，通过分析列车停站控制过程的实时运行数据找到停站精度差的原因，提出屏蔽门安装位置确定的方法，并给出了列车停车位置与屏蔽门位置不一致的对策。     

浅析沥青路面施工组织以碾压为中心的重要性

通过对施工组织中的主要矛盾进行分析,确定以碾压作为施工组织的中心,可以更好地保证路面施工质量.     

On the overriding issue of train front end collision in rail vehicle dynamics

A three-dimensional dynamic model of crashed vehicles coupled with moving tracks is developed to research the dynamic behaviour of the train front end collision on tangent tracks. The three-dimensional dynamic model consists of a crashed vehicle model, moving track models, a simple wheel–rail contact model, a velocity-based coupler model and the model of energy absorption and anti-climbing devices. The vector method dealing with the nonlinear wheel–rail geometry is put forward in the paper. The developed model is applicable in the scope that central collisions occur on tangent tracks at low speeds. The examples of the vehicle impacting with a rigid wall and the train front end collision are carried out to obtain the dynamic responses of vehicles. The overriding issue is studied on the basis of the wheel rise in train collisions. The results show that the second bogie of the first colliding vehicle possesses the maximal wheel rise. The wheel rise increases with the increase of vehicles. However, the number of vehicles has tiny influence on the overriding in train collisions at low speeds. On the contrary, the impact speed has significant influence on the overriding in train collisions. The wheel rise increases rapidly if the impact speed is close to the critical speed of overriding. The large wheel rise is principally generated by the great coupler force related to the rigid impact in the axial direction.     

斜拉桥主梁悬浇用预应力粗钢筋张拉控制

介绍了斜拉桥平衡长悬臂预应力施工的关键技术,提出了精轧螺纹钢在张拉控制的主要技术措施。对桥梁的精轧螺纹钢张拉施工具有一定的参考价值。