CRH2列控车载测速测距设备EMC实验及防护方法

CRH2型动车组具有特殊的电气接地方式,为车载电子设备带来了复杂的电磁兼容环境。在动车组运行过程中,围绕车载ATP测速测距设备发生了一些电磁兼容问题。通过对车载ATP测速测距电磁兼容问题的分析及实验研究,对相应的防护改进方法进行了介绍与探讨。     

Effect of a speed reduction of containerships in response to higher energy costs in Sulphur Emission Control Areas

The objective of this paper is to explore the possible consequences of the future low-sulphur fuel requirements in Sulphur Emission Control Areas (SECA) on vessel speed, from the standpoint of the container shipping industry. Rational energy use, speed reduction, and revenues are closely related in the container shipping sector because speed reductions may provide substantial energy and cost savings. The operators could consider reducing their speed in SECA in order to save on fuel that will become relatively expensive. However, to maintain a weekly frequency without adding new ships, such a behaviour implies that the required speed at sea outside the SECA area increases. This paper aims to investigate if such a difference in speed is cost-effective, and if the increase in speed outside SECA may result in an increase in CO₂ emissions of the total cycle. We propose a cost model that estimates the cost-minimising combination of speeds inside and outside SECA, and the resulting CO₂ emissions of the liner service. Applying this model to representative liner services serving North Europe, we find that differentiating speed accordingly slightly decreases total costs and increases CO₂ emissions in a similar way. The results are sensitive to the price of low-sulphur fuels, the part of the cycle in SECA and the number of ships deployed in the service.     

ISO与ITTC方法在实船航速修正应用对比

介绍了ISO15016：2015和ITTC2017两种实船航速修正方法，对比了两种修正方法的测速要求和修正流程。并通过8种具有代表性的船舶试航数据，采用两种方法对试航数据进行修正，分析了不同环境因素的修正结果，可为今后船舶EEDI测速试验和航速修正提供参考。     

兰新高铁化学固沙防护工程试验研究

基于室内试验,对4种固沙剂的各项性能指标进行了测试和分析,并在烟墩风区开展现场试验。室内试验结果表明:固沙剂的黏度随着温度降低呈增大的趋势,在-20℃时出现结冰现象;固沙剂浸水后表面有溶胀现象,但风蚀量均小于1%;固化层平均厚度依次为A型>B型>C型>D型,B型层厚最均匀;风洞试验中固沙剂的质量损失率都小于1%,均具有良好的抗风蚀能力;时效性A型最优,成本A、D型最高。现场试验表明:喷洒固沙剂的沙方格抗风蚀能力明显强于未喷洒固沙剂的沙方格,喷洒固化剂的沙方格有效地发挥了固沙作用。     

Speed management strategies and drivers' attitudes in Thailand

In Thailand where speeding on highways and roads has been a key contributing factor in road traffic crashes, considerable efforts to control vehicle speeds have been made, mostly through speed limit enforcement. However, the fact that speed limits are very often violated on a large scale in Thailand suggests the need for implementing more effective speed management strategies such as automatic speed cameras, increasing speeding penalty, and smart vehicle design to control vehicle speeds. While the effectiveness of such measures depends mainly on how well they could lead drivers to change speeding behavior, public acceptability is also vital as a key to sustainability of most speed management programs. This paper attempts to identify public acceptability of speed management measures, both currently implemented and under consideration, in Thailand. In doing so, data from the questionnaire surveys based on a random sample of 2180 drivers in Thailand including a wide range of individual characteristics of respondents and their attitudes to select speed management schemes are analyzed using an econometric technique. In particular, we introduce a simplified methodological framework to develop a better understanding of factors that explain drivers' attitudes towards speeding behavior and alternative speed management strategies. Findings from this research provide several important implications that could improve the current practices of speed management in Thailand.     

信号交叉口进出口段限速标志对运行效率的影响研究

限速标志在对速度管控的同时,对运行效率也有影响。作者以嘉兴市G320-文昌路平面信号交叉口为例,结合实地调研与VISIIM模拟,运用前后对比法分析了该交叉口设置基本路段限速90 km/h和在进口前100米限速70 km/h及全段80 km/h限速两种限速情形下的行程时间、延误时间、排队长度及停车次数的差异。结果表明,在信号交叉口进口范围内设置较基本路段低的限速,对交通安全改善作用不大,还会在一定程度上降低运行效率。     

基于PARETO最优解的重型汽车传动系速比优化

针对某重型汽车动力传动系统匹配设计中遇到的参数反求问题,提出了基于PARETO最优解的重型汽车传动系统参数优化方法.建立了某算例车型的CRUISE仿真模型的近似模型,并将其作为多目标优化的代理模型.利用Matlab遗传算法工具箱对该优化问题进行了求解,得到了算例车型传动系参数的1组PARETO最优解集.结果表明,计算所得PARETO解集能为工程人员提供多种可选方案,方便其选择合适的传动系统参数.     

金属带式CVT速比控制的仿真与试验研究

针对装备金属带式无级变速器(CVT)的整车,建立了无级变速传动系统数学模型.以无级变速汽车动力性和经济性相协调为目标,设计了Fuzzy-PI复合速比控制器.采用Fuzzy-PD控制策略和Fuzzy-PI复合控制策略对汽车起动工况进行了仿真分析,对装备金属带式CVT的某轿车进行了起动工况的模拟试验.结果表明,Fuzzy-PI复合控制策略优于Fuzzy-PD控制策略,速比的试验结果与理论数据一致,说明所建模型合理.     

影响T·CL型驼峰测速雷达测量精度的原因与对策

雷达在使用过程中由于自身原因、外界环境、安装不符合标准以及设计缺陷导致测速不准,找出其中原因并制定改进对策,提高了雷达的测速准确性。     

自动化驼峰速度控制故障分析与预防

结合自动化驼峰的特点及其出现的常见故障，将速度故障进行列举分析，提出相应的应对措施，降低故障，保障安全。