中国铁路管理信息系统的结构分析

在对我国铁路各主要职能部门管理信息系统的信息交流关系定性分析的基础上,运用总体结构等级分析法明确各管理信息系统的地位和相互关系,提出铁路管理信息系统集成应该以具有强关联的运输管理信息系统为核心,以安全、财会管理信息系统为引导,抓住重点,运用基层运输管理信息系统的推动作用和上层安全、财会管理信息系统的拉动作用加快铁路信息化的发展.     

精细时程积分法在液压仿真系统中的应用

为了有效避免液压系统仿真过程中的刚性问题，引人精细时程积分法，相对于以往的计算方法，它不仅使仿真结果精确，且可以较为有效的避免刚性问题，取得了令人满意的效果。     

多值非线性系统的自适应控制

提出了带有多值非线性环节的线性离散系统的自适应控制算法，仿真实验的结果表明：该算法简单易行具有明显的优点，跟踪误差比采用一般的自适应控制算法时要小得多，且能保证闭环系统大范围近收敛。     

BITBUS结构及其在电气化复线渡线开关监控系统中的应用

本文提出在电气化铁路远动系统中采用高性能，低价格，灵活易用的通讯网络ＢＩＴＢＵＳ构成分层的分布式网络系统，用网络结构代替常规的双机加切换器的结构。既简化了系统结构了又成功地解决了系统资源的共与分配，并为系统以后可能的扩展与联网打下了基础。运用软件工程学的有关技术和方法开发系统软件，使系统结构清晰，易于维护和扩充，本文针对电气化复线渡线开关监控系统的特点，给出了该系统采用的软，硬件方案及其实现过程。     

Multiphysic modelling of railway vehicles equipped with pneumatic suspensions

This article presents a multidisciplinary approach of railway pneumatic suspension modelling: both multibody and pneumatic aspects are taken into account. The work aims at obtaining a realistic model of the secondary suspension and coupling it with a multibody model of a train. Various components of the pneumatic circuit such as bellows, tanks, pipes and valves are taken into account. The article focuses on the bellow-pipe-tank subsystem for which several modelling approaches are presented and compared. Differences between differential and algebraic models are highlighted, and an application-dependent choice between them is suggested. A complete model of the pneumatic circuit is then obtained and coupled with a multibody model of the train. As a result, the behaviour of a suburban train equipped with a pneumatic secondary suspension is analysed, in particular undesired oscillating motions which affect the comfort. Topological modifications and improvements of the suspension are also investigated and discussed.     

舰载作战系统新一代网络技术发展探讨

着重分析了目前舰载作战系统的网络结构，指出了所存在的不足，介绍了目前较流行和成熟的商用网络传输体制，分析了今后新一代作战系统网络技术的发展趋势，提出了利用合适的成熟商用网络传输体制进行二次开发，并在此基础上构建开放式RPR弹性分组环网络，给出了网络拓扑结构。     

新能源汽车的动力电池标准体系研究

近些年来,随着我国环保观念的增强,新能源汽车行业得到了较为迅速的发展,作为其中关键的动力电池有着非常关键的作用。但是,从现实情况来进行分析,可以发现动力电池行业仍然存在着诸多问题,特别是标准体系的建立还并不完善,不利于新能源汽车行业的长期稳定发展。本篇文章简要分析了动电池标准体系的发展情况,研究了新能源汽车动力电池标准体系,并探究了新能源汽车动力电池标准体系今后的发展方向,希望能够为新能源汽车行业的稳定发展提供支持。     

Total cost analysis: An alternative to benefit-cost analysis in evaluating transportation alternatives

This paper explains the theory in support of total cost analysis (TCA) to compare transportation system alternatives. The full costs of each alternative are first aggregated, including travel time costs and monetizable environmental and social costs. Many costs which are considered on the benefits side of the equation in benefit-cost analysis (BCA) as "cost savings" are brought over to the costs side. Total cost differences among alternatives are then traded off against their estimated non-monetized benefits or impacts, just as a consumer trades off product quality against cost before deciding which product he or she will buy. One advantage of TCA over traditional BCA is that the concept of "total cost" is more easily understood by the public and by political decision-makers than BCA concepts such as "net present worth", "benefit-cost ratio" and "internal rate of return". A second advantage is that there is no suggestion that all "benefits" have been considered; decision-makers are free to use their own value judgements to trade off total cost against non-monetizable social, environmental and economic impacts, just as they trade off quality and convenience against cost when purchasing goods and services in their roles as consumers. The TCA approach is demonstrated in this paper through a case study of two systemwide alternatives for the Baltimore, MD urban area.     

超大跨度缆索承重桥梁结构体系

设计和建造跨海连岛大桥是新世纪桥梁工程面临的巨大挑战。超大跨度桥梁并不只是常规概念的外推,需要与之对应的结构体系。从根本上改变缆索承重桥梁的缆索体系,可以突破跨度极限。本文指出了常规结构体系向更大跨度发展的制约因素,从缆索体系的角度介绍了超大跨度斜拉桥、悬索桥以及斜拉 悬索组合桥可能采用的各种体系。这些体系试图在静力、动力方面能远远超出现有限制范围,极大地提高桥梁的跨越能力。同时,新体系的采用也给材料、设计和施工提出了很大的挑战。