A constraint programming model with time uncertainty for cooperative flight departures

The lack of a proper integration of strategic Air Traffic Management decision support tools with tactical Air Traffic Control interventions usually generates a negative impact on the Reference Business Trajectory adherence, and in consequence affects the potential of the Trajectory-Based Operations framework. In this paper, a new mechanism relaying on Reference Business Trajectories as a source of data to reduce the amount of Air Traffic Controller interventions at the tactical level while preserving Air Traffic Flow Management planned operations is presented. Artificial Intelligence can enable Constraint Programming as it is a powerful paradigm for solving complex, combinatorial search problems. The proposed methodology takes advantage of Constraint Programming and fosters adherence of Airspace User’s trajectory preferences by identifying tight interdependencies between trajectories and introducing a new mechanism to improve the aircraft separation at concurrence events considering time uncertainty. The underlying philosophy is to capitalize present degrees of freedom between layered Air Traffic Management planning tools, when sequencing departures at the airports by considering the benefits of small time stamp changes in the assigned Calculated Take-Off Time departures and to enhance Trajectory-Based Operations concepts.     

GPS在载体姿态测量中的应用

本文主要介绍利用ＧＰＳ进行勒体姿态测量的工作原理、有关技术及ＧＰＳ姿态测量系统的组成。利用ＧＰＳ测量姿态，精度不会随时间而降低，运用皮信号测量不涉及Ｐ码及Ｃ／Ａ码的具体结构，造反可用性（ＳＡ）和轨道误差及电离层折射误差可以忽略不计，比通过惯性猎取将更便宜、精度更高。在不远的将来，这种技术可望在某些领域代替惯性技术，或与惯性系统组合，成为一种新的高精度、高可靠性、成本低的导航系统。     

失速性能的现场检测

液力传动工程机械的整机出力不足时,要判明其原因是发动机输出功率不足,还是传动系有故障,这是现场经常遇到的一个问题。本文介绍的本机现场失速性能测定法,使用一只光电转速表即可评定原机稳定工况下的发动机功率,是一种判断机械出力不足故障原因的有效方法.     

油管螺纹图像处理方法研究

油管螺纹图像主要用于对螺纹形貌的观察和测量。对螺纹图像采用了低通滤波、对比度变换、高通滤波等处理方法,有效地改善了图像的质量。用于尺寸测量的螺纹牙型图像根据其直方图的特征,首先采用灰度阈值分割法分离牙型轮廓,生成二值图像,然后利用跨度最小的Roberts算子提取二值图中螺纹轮廓线,得到的轮廓边缘细致、准确,可以用于尺寸测量。     

气缸套综合测量

从实际应用的角度出发，针对气缸套实际测量中遇到的问题，提出了几种较为实用的气缸套周长测量和圆评定的计算方法，并编制了计算程序，计算结果与真圆数值的对比表明，所提算法正确可行，能够满足生产中的精度要求。     

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     

船舶自动避碰仿真平台的构建与测试方法研究

船舶避碰智能决策的自动生成是实现船舶自动避碰的关键技术之一,如何利用船舶操纵模拟器技术来检验现阶段的研究成果是值得研究的课题。根据船舶避碰智能化方法的研究现状,简述船舶避碰智能自动化方法的基本思想;着重论述基于船舶操纵模拟器技术的“航行安全及自动避碰(NSACA)仿真测试平台”的构建及其实现船舶自动避碰仿真试验的方法;并列举一个典型的仿真试验示例加以分析。试验结果表明:该平台已实现了宽水域船舶避碰决策自动生成与避碰过程自动监控的测试,不失为一种行之有效的测试方法;与实船试验相比,这种测试方法具有灵活高效、安全性和经济性等优点。     

船舶在实施ISPS规则中存在的问题及对策

从船舶保安等级的确定,对船舶限制区域的控制,船舶保安演习的开展,PSC对船上保安的监督管理等方面说明实施ISPS规则对船上工作的要求；并根据船上在实施保安规则过程中存在的问题,提出做好船上保安工作的对策与建议。     

Real-world gaseous and particle emissions of a Bi-fuel gasoline/CNG Euro 6 passenger car

The objective of the present study is the assessment of the environmental impact of a bivalent (bi-fuel) vehicle, running either on gasoline or compressed natural gas (CNG). To that aim, a Euro 6 passenger car was tested under various real-world driving conditions. In order to cover the full range of conventional powertrains currently in the market, the tests were also repeated on a Euro 6 diesel passenger car. Both cars were driven in two routes, the first complying with the regulation limits and the second going beyond them. Carbon monoxide (CO), nitrogen oxides (NO_x) and particle number (PN) emissions were recorded using a Portable Emissions Measurement System (PEMS). Apart from the aggregated emission levels, in g/km, the exact emission location along the route was also assessed. Natural gas proved beneficial for CO and PN emissions, the level of which always remained below the respective legislation limits. On the other hand, under the dynamic driving conditions with gasoline, the relevant limits were exceeded. Cold start, occurring at the beginning of the urban part, and motorway driving were identified as major contributors to total emissions, especially in gasoline mode. However, the application of natural gas was associated with a penalty in NO_x emissions, which were significantly increased as compared to gasoline. Local peaks within the urban part were identified in CNG mode. In any case, the diesel vehicle was by far the highest NO_x emitter.     

便携式JARC-1000型或门动态继电器检测仪

以单片机为主体研究开发了便携式JARC—1000型或门动态继电器测试仪，可自动完成继电器的机械特性、电气特性、动态特性测试，精度高，效果好。