Control-based optimization approach for aircraft scheduling in a terminal area with alternative arrival routes

This paper presents an optimization approach for dynamically scheduling aircraft operations and supporting air traffic controllers in both determining and implementing operationally feasible landing and departure times at an airport. The mixed integer linear programming model proposed incorporates air traffic control infrastructure in terms of route network, introduces the concept of alternative approach routes and is designed to generate an output that can be converted into effective advisories for executable flight commands. It shows reasonable computational times for obtaining the optimal solution and delay reductions of up to 35% with practical size instances from Sao Paulo/Guarulhos International Airport.     

基于遗传算法的物流运输与调度优化研究

物流优化是物流企业降低物流成本的主要方式之一,通过物流优化进一步提高物流公司的服务能力,已经是许多物流企业提升竞争力的一项有效举措。本文依据现实中的物流运输问题,建立了基于运输成本和时间的一般函数模型,利用遗传算法进行求解,寻求最优运输路线。算例结果表明使用遗传算法优化运输方式,可以改善现有的调度模式,在满足时间约束的条件下,实现物流运输成本最小。     

考虑属性关联的不确定语言变量R-TOPSIS模型

采用不确定语言变量进行决策是有效反映客观事物的复杂不确定性以及人类思维的模糊性手段。针对多属性决策问题中属性之间具有相互关联作用这一问题,在引入加权决策距离矩阵和Choquet积分构建了一种考虑属性关联的R-TOPSIS语言决策方法。最后结合案例说明该方法的决策过程以及该方法的可行性和有效性。     

高职模具专业理论实训一体化教材编写方案浅谈

目前,高职模具设计与制造专业教材的主要不足是没能培养学生设计模具、制造模具的技能,学生很难找到专业对口的专业技术岗位。文章阐述了高职模具设计与制造专业理论实践一体化教材编写方案、主干课程的组成与各课程主要内容。     

低承载力处涵洞的基础设计

在地基承载力较低的位置设置涵洞时往往会因为地基承载力小于涵洞基底应力而需要进行大量换填,当采用整体式基础涵洞时可以大大减少涵洞的基底应力从而使地基承载力满足要求。     

风机盘管冷凝水盘加工工艺研究

本文对风机盘管冷凝水盘的加工工艺方案进行了系统研究,创新地提出了包括盘体钣金件分步拉伸工艺方案、海绵滚压成型工艺方案、海绵电热切割工艺方案等一整套加工工艺方案。工艺方案经实践证明切实可靠,研究结果对冷凝水盘的生产具有重要的实际指导意义。     

论企业铁路调车自动化与调车安全防护

本文就企业铁路调车自动控制方式与调车作业安全防护方面进行探讨,重点在于将企业铁路基础信息、现车以及所有车辆信息纳入整体信息管理之中,结合车辆属性类型、线路实时情况自动选择车列行走径路,使用无线数据传输方式将实时站场情况和调车计划等传送至相应的调车机上,并在此基础上实现调车作业的安全防护。     

基于OpenMP的并行蚁群物流调度算法研究

物流中心调度问题是物流管理的核心问题,基于OpenMP并行编程规范,提出了基于蚁群的物流调度并行优化算法,挖掘多核高性能计算能力,提高物流过程中物件的动态分配效率,提高物流调度系统的可扩展性。     

整体式减速器箱体的有限元分析

采用ANSYS对整体式减速器箱体进行了有限元模态分析。运用SolidWorks建立了箱体的几何模型并导入ANSYS软件,在网格划分时兼顾考虑了分析精度和效率,得到了较好的有限元分析模型。最后利用BlockLanczos方法计算并分析了减速器箱体的前十阶固有频率和振型。模态分析结果对产品的故障诊断和设计改进具有基础研究价值。     

Supply optimization for the production of raw sugar

Based on a case study from Venezuela, the production of raw sugar is investigated. Ideally, sugar mills operate at a constant production rate. However, safety stocks of the raw material cannot be maintained as sugar cane quality deteriorates very rapidly. Sugar cane is therefore continuously sourced in diverse quantities and qualities from hundreds of geographically dispersed haciendas and supplied to the milling process. Furthermore, due to weather conditions changing throughout the year, tight time windows must be observed for harvesting.The approach presented in this paper aims at preserving a constant supply while minimizing the associated costs. The entire planning problem is structured in a hierarchical fashion: (1) cultivation of the haciendas, (2) harvesting, and (3) dispatching of the harvesting crews and equipment. The corresponding optimization models and solution procedures are introduced and applied to the case study problem.