城轨交通乘客资讯系统

为满足人们在乘坐城市轨道交通工具的过程中，对不间断接收新闻等一系列资讯信息的需求，不断提升服务水准和服务水平，体现以人为本的宗旨，建立乘客资讯系统是完全必要的。为此对乘客资讯系统的现状、功能和组成方案进行研究和探讨。     

CHARACTERISTICS OF ACTIONPOTENTIAL AND THEIR UNDERLYING OUTWARD CURRENTS IN MAMMALIAN TASTE RECEPTOR CELLS

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An Investigation into Stick-Slip Vibrations on Vehicle/Track Systems

A model for the numerical simulation of vehicle/track interaction and stick-slip vibration is presented. A finite element model is developed to calculate vertical contact forces. These forces are then coupled through the contact patch into a non-linear time-domain model by which the stick-slip vibration behaviour of a wheel-rail system is analysed. The investigation suggests that stick-slip vibration may occur if a vehicle which has a maligned or an initial 'wind-up' wheeiset meets a vertical irregularity or contaminants on the track.     

中国古典园林与中国古典诗歌的关系

中国古典园林与古典诗歌的联系颇为紧密,在其内在的审美意境上互为相通互为映照,而在实际创作过程中也一并共同营造出一种诗景交融的综合艺术效果。本文旨在探索此两种艺术形式之间的关系,发掘其艺术语言的魅力之处。     

硫磺砂浆在益家河右线大桥施工中的应用

硫磺砂浆作为一种新型热塑性材料,具有硬化快、高早强、处理方便、可回收、经济安全等优点,在土木工程领域,尤其在大型桥梁建设中,有着广泛的应用前景。结合工程实例,介绍了硫磺砂浆的性能、配制及其在桥梁工程施工中的应用及注意事项。     

舰船全寿期配置管理及其编码映射技术研究

舰船全寿期各配置视图,既是全寿命优化设计的结果,又是实现舰船预期功能并保证这些功能有效实施的关键技术.为保证配置的唯一性和处理方便,配置是用各主要编码来表达的.本文所提出的各配置之间的算法乃是实现配置自动处理的基础.舰船全寿期配置管理是实现各配置视图生成、相互映射、配置更改及其状态跟踪技术的综合应用,亦是保证舰船质量和有效使用及全寿期信息共享的核心.     

船舶生产设计日程管理系统研究

船舶生产设计管理是一项复杂的系统工程,其中有大量复杂的数据和信息.文章分析了目前船舶设计的管理状况,从生产设计着手,重点介绍了一个日程管理系统的基本思路和功能,包括分析劳动负荷、分配任务、实时监控、人力资源优化配置和计划调整,使整个设计工作可以合理高效地完成.     

部分水解PAN纤维的性能研究

应用红外光谱仪、元素分析仪、比表面分析仪等对PAN原纤维及其部分水解PAN-COOH型纤维进行了表征,讨论了影响基体PAN纤维强度的主要因素和碱性条件下的水解反应。获得了干态:强度9.6cN/dtex、交换容量0.26mmol/g、比表面积0.58m2/g的PAN-COOH型离子交换纤维。详细地讨论了该纤维的比表面构成、氰基转化成羧基的比率、羧基在纤维表面的排列及最大理论水解量。     

Recent Development in Active Steering of Railway Vehicles

Summary This paper presents the recent development on active steering for railway vehicles, and carries out a technical appraisal of different actuation schemes and control approaches. It brings together the latest research activities and findings for the full active steering techniques for rail vehicles with the solid-axle wheelsets, independently-rotating wheelsets and wheel-pairs without axles, but relevant work on passive and semi-active solutions is also briefly described. Potential benefits of the use of a combination of modern control technology and mechatronic approach are evaluated, and in particular solutions for the difficult design trade-off between the stability and the curving performance are presented. Various actuation configurations are discussed, and advantages and drawbacks of those schemes are investigated. The outline design using a number of control methods is analysed, and measurement requirement and state estimation techniques essential for implementation of the active steering schemes are also explored. In addition the issue of safety criticality is highlighted and a possible approach for developing fault-tolerant systems is proposed. Overall the paper provides an authoritative assessment of the major advances in actively-steered wheels and addresses outstanding critical issues.     

Kriging assisted on-line torque calculation for brushless DC motors used in electric vehicles

Torque is one of the most important control factors for a vehicle’s motion. Compared with internal combustion engines, electric motors can have a more accurate torque feedback which brings a lot of advantages to vehicle dynamics and stability control. However, motors used in electric vehicles are facing more difficult conditions than those in conventional applications, such as extreme high/low temperature changing, vibration, aging, etc. The variation of motor parameters due to harsh working conditions can lead to serious problems for motor torque estimation and thus dynamic control of electric vehicles. In this paper, a new method using kriging to estimate the back EMF and thus accurately calculate motor torque in an on-line fashion is presented. With motor speed and rotor position as inputs, kriging predicts back EMF as the output that is used to calculate the motor torque with three phase currents. Using this novel method, motor torque can be accurately calculated even facing high/low temperatures or aging conditions. Experimental tests under the high temperature have been conducted to verify the applicability of the proposed method.