大型船舶平面分段智能车间的物流系统

目前,车间级的物流系统调度问题研究主要通过信息采集和现场监控解决,并没有通过优化算法进行实际分析。本文主要研究大型船舶平面分段智能车间的工件、物流设备的调度问题。首先将平面分段中的不同工位进行重组,同时将天车和卡车进行并行处理。其次引入有阻塞的混合流水线车间调度模型,搭建大型船舶平面分段智能车间物流系统的数学模型。最终基于粒子群优化算法(PSO),计算部件加工时间最短的数值仿真。     

An autonomous system for maintenance scheduling data-rich complex infrastructure: Fusing the railways’ condition,planning and cost

National railways are typically large and complex systems. Their network infrastructure usually includes extended track sections, bridges, stations and other supporting assets. In recent years, railways have also become a data-rich environment.Railway infrastructure assets have a very long life, but inherently degrade. Interventions are necessary but they can cause lateness, damage and hazards. Every day, thousands of discrete maintenance jobs are scheduled according to time and urgency. Service disruption has a direct economic impact. Planning for maintenance can be complex, expensive and uncertain.Autonomous scheduling of maintenance jobs is essential. The design strategy of a novel integrated system for automatic job scheduling is presented; from concept formulation to the examination of the data to information transitional level interface, and at the decision making level. The underlying architecture configures high-level fusion of technical and business drivers; scheduling optimized intervention plans that factor-in cost impact and added value.A proof of concept demonstrator was developed to validate the system principle and to test algorithm functionality. It employs a dashboard for visualization of the system response and to present key information. Real track incident and inspection datasets were analyzed to raise degradation alarms that initiate the automatic scheduling of maintenance tasks. Optimum scheduling was realized through data analytics and job sequencing heuristic and genetic algorithms, taking into account specific cost & value inputs from comprehensive task cost modelling. Formal face validation was conducted with railway infrastructure specialists and stakeholders. The demonstrator structure was found fit for purpose with logical component relationships, offering further scope for research and commercial exploitation.     

Short-term traffic flow prediction using time-varying Vasicek model

This paper provides a two-step approach based on the stochastic differential equations (SDEs) to improve short-term prediction. In the first step of this framework, a Hull-White (HW) model is applied to obtain a baseline prediction model from previous days. Then, the extended Vasicek model (EV) is employed for modeling the difference between observations and baseline predictions (residuals) during an individual day. The parameters of this time-varying model are estimated at each sample using the residuals in a short duration of time before the time point of prediction; so it provides a real time prediction. The extracted model recovers the valuable local variation information during each day. The performance of our method in comparison with other methods improves significantly in terms of root mean squared error (RMSE), mean absolute error (MAE) and mean relative error (MRE) for real data from Tehran’s highways and the open-access PeMS database. We also demonstrate that the proposed model is appropriate for imputing the missing data in traffic dataset and it is more efficient than the probabilistic principal component analysis (PPCA) and k-Nearest neighbors (k-NN) methods.     

新颖船用CWJK23型遥控系统

ＣＷＪＫ２３型船用柴油机电气混和式遥控系统具有操纵主机的全部逻辑功能。系统采用模块化设计，并应用线性积分电路与精密比例压力调节阀ＭＰＰＥ－２匹配，驱动主机执行机构进行调速，大大缩短了气控管系，使实船安装调试简便，参数调整容易，配机特性好，适用于大多数采用气控操作的柴油机。     

关于数控机床夹具设计的若干问题

由于近年来国内(尤其是路内)很多工厂采用了先进的数控加工技术,如何设计合适的数控机床夹具,以充分发挥数控设备及其加工线的经济效益,就成为一个急待解决的关键问题,本文对数控机床夹具的设计特点和设计中应注意的一些问题,以及如何选用相应的机床夹具类型等,作了扼要的阐述.     

基于静力的智能桥梁结构智能计算方案的研究

智能土木 桥梁结构在线监测环境下的智能计算是结构智能化的必要条件。通过对该环境下两种基于静力的计算路线的分析比较,给出了一个集神经网络力学反问题解法和有限元力学正问题解法为一体的智能计算方案。方案通过对荷载(被定义为结构工作状态指标)的实时识别和实时分检,以及分检状态流的有限元分析,建立实时、在线的结构健康监测机制和准实时、在线的结构健康诊断机制。结合模型试验,对方案予以初步实现并进行了仿真验证,其仿真计算结果表明该方案是可行的,有必要对其加以研究和完善。     

GPS/DR/GIS技术在基于GSM-R列车监控系统中应用

列车监控系统是IRS(智能铁路系统 )的主要组成部分。阐述了列车监控系统的基本组成。着重介绍了GPS/DR组合定位以及GIS在列车定位和监控中的作用 ,并探讨了用GSM R移动通信网实现GPS定位数据传输的有效性     

WD320动力稳定车计算机控制系统软件开发

介绍与大型养路机械０８－３２型岛固车配套使用的ＷＤ３２０动力稳定计算机控制系统的快速汉字显示，动态图形显示，以及适用于大批量逻辑表达式计算的软件开发技巧。     

35000kN机械压力机摩擦离合器与制动器的改进

针对第一汽车制造厂用于冲压生产的35000kN机械压力机原多盘摩擦离合器与制动器存在的问题,改进设计成单盘浮动镶块式的结构。并对有关问题进行了探讨。为大型机械压力机离合器与制动器的设计与改进提供了必要的参考数据,积累了实践经验。