PDM与CAD的数据共享与应用集成

以三维CAD系统Inventor为例,探讨了CAD和PDM系统之间的数据共享和应用集成技术,PDM通过CAD的API（Add—In）获取产品设计信息,CAD通过PDM的Web服务获取产品零部件的“外部”属性,从而实现CAD和PDM系统之间的数据共享和应用集成．     

武工GT-CAD系统的结构及其特点

武工GT-CAD系统是武汉工学院结合某企业轴类零件开发的软件。本文着重介绍了该系统的研究方法、系统的结构及其主要功能特点。该系统以成组技术(GT)为基础,建立了CAD数据库和相似零件库;以Auto CAD系统为底层功能进行特征参数造型,系统输出的CAD特征模型数据和文件,可直接为后续CAPP系统利用,它是CAD/CAPP/CAM集成系统的重要组成部分。     

制冷工程计算机辅助设计技术的探讨

本文在对目前国内较流行的工程工作站CAD系统及微机CAD系统作简单介绍基础上，结合制冷工程CAD技术的发展现状，认为近年内制冷工程CAD技术将以工程工作站为主，微机系统为辅的趋势发展，并讨论了制冷工程CAD系统二次开发的策略和内容。     

基于SolidWorks的挤压模CAD系统

CAD技术已逐渐从二维系统向三维实体造型方面转变.以Solidworks作为支撑平台,以Visual Basic和Access为开发工具,应用面向对象的程序开发方法,开发了一个挤压模CAD系统.对该系统的设计做了概括性的描述,并介绍了该系统的软件开发过程中的关键技术.     

机械CAD系统中的型材标准数据管理及参数化设计

利用基于AutoCAD2000的VBA(Visual Basic for Application)技术进行机械设计CAD系统的开发。讨论了VBA技术在CAD系统二次开发中的作用，提出了一种以数据库和参数化设计为技术支撑的CAD标准数据库的实现机制与组织方式。从型材CAD系统建立的基本原则展开分析，对型材CAD的体系结构，系统总体设计，标准数据库的设计及几何图形程序库的设计进行了详细的论述。实现了常用型材标准数据信息的管理及辅助设计。     

浅谈在GIS背景下测绘CAD数据的准备

以建立地理信息(GIS)系统为背景,探讨CAD数据与GIS数据的区别以及传统基础测绘数据(CAD)存在的缺陷,并给出明确的完善措施。     

广义CAD系统综合集成分析

在分析广义CAD系统具备开放的复杂巨系统特征的基础上，证明广义CAD系统实质为综合集成系统，进而提出广义CAD系统综合集成的模式与过程，并研究了广义CAD系统分层次信息处理的综合集成方法．     

工厂CAD中的大规模定制技术研究

为了简化工厂设计项目中数量庞大、形式多变的对象的处理,研究了在工厂CAD系统中应用大规模定制方法论的基本原理,阐述了工厂CAD系统中大规模定制技术的基本构成以及实现模型。最后以钢结构CAD项目中的节点设计为实例,展示了应用大规模定制方法论的效果。     

搅拌混合设备三维参数化CAD系统的研制

为实现搅拌混合设备工艺计算、选型、设计流程化和规范化,对该设备的CAD系统进行了研究,分析了系统的功能需求,规划了系统的设计流程,以知识库和三维参数化技术相结合的方式构建了CAD系统,给出了实例数据库的模型结构,并讨论了系统具体的实现方法。     

异形产品缓冲包装CAD系统的研究与开发

介绍了异形产品缓冲包装CAD系统的总体构成、主要功能模块以及系统的开发与实现.系统以异形产品为研究对象,基于OpenGL技术,使用VisualC++进行软件开发,实现能够集成缓冲衬垫计算与校核、瓦楞纸箱计算与校核、托盘集装设计及产品信息数据处理、图片显示等功能一体化的缓冲包装CAD系统.     

基于二进制粒群的拣选作业优化

目的提高电子标签拣选系统中拣选作业的效率与货位占有率。方法以某电子拣选库为研究对象,提出以订单完成度、货位占有率以及货位聚集度为目标的拣选优化模型。设计基于二进制粒子群算法(BPSO)和遗传算法(GA)的模型求解仿生算法。结果试验及优化结果表明,基于BPSO的电子拣选库订单的完成度、货位占有率以及货位聚集度较遗传算法更高。结论基于二进制粒子群算法求解的优化模型较符合实际的电子拣选库人工拣选作业,同时仓储作业货位的利用率及拣选效率得到了提高。     

基于货损约束的配送系统优化模型

以流通型集配中心为研究背景,研究了配送过程中产生货损的三种作业方式的选择问题,建立了以货损率为约束条件的整数规划随机模型,通过对随机变量进行等价变换,将不确定性问题转化为确定性等价问题,从而方便了问题的求解.     

家电托盘货物单元的共振性能实验研究

家电产品的托盘货物单元采用多层堆码时,各层货箱的共振频率不同于单一货箱的。介绍了托盘集装单元的动力学模型,通过扫频振动实验和自功率谱分析,确定了各层货箱的共振频率,探讨了其固有频率与堆码高度之间的关系。实验结果表明:在一定振动频率范围内,对于多层堆码的高粘弹性货箱,底层货箱的固有频率高于顶层货箱的,各层货箱堆码高度对其共振频率有影响。     

商品单价与运输模式选择间的关系

根据广东省海关的统计数据,选择了四种代表性商品作为研究对象.通过同类商品相同运输模式下不同贸易方式商品单价的比较,以及同类商品相同的贸易方式下不同运输模式商品单价的比较,揭示了商品单价与运输模式选择之间的内在联系.研究表明,国际贸易商品单价是一个动态变量,而且同类商品出口单价与进口单价、海运商品和空运商品单价的对应关系也同样处在动态变化过程中.用单一的临界值来决定不同类商品在国际贸易中运输模式的选择缺乏实践的支持.     

Multicompartment Tubular Micromotors Toward Enhanced Localized Active Delivery

A tubular micromotor with spatially resolved compartments is presented toward efficient site-specific cargo delivery, with a back-end zinc (Zn) propellant engine segment and an upfront cargo-loaded gelatin segment further protected by a pH-responsive cap. The multicompartment micromotors display strong gastric-powered propulsion with tunable lifetime depending on the Zn segment length. Such propulsion significantly enhances the motor distribution and retention in the gastric tissues, by pushing and impinging the front-end cargo segment onto the stomach wall. Once the micromotor penetrates the gastric mucosa (pH ≥ 6.0), its pH-responsive cap dissolves, promoting the autonomous localized cargo release. The fabrication process, physicochemical properties, and propulsion behavior are systematically tested and discussed. Using a mouse model, the multicompartment motors, loaded with a model cargo, demonstrate a homogeneous cargo distribution along with approximately four-fold enhanced retention in the gastric lining compared to monocompartment motors, while showing no apparent toxicity. Therapeutic payloads can also be loaded into the pH-responsive cap, in addition to the gelatin-based compartment, leading to concurrent delivery and sequential release of dual cargos toward combinatorial therapy. Overall, this multicompartment micromotor system provides unique features and advantages that will further advance the development of synthetic micromotors for active transport and localized delivery of biomedical cargos.     

Investigation into the ship motion induced moisture migration during seaborne coal transport

The inherent moisture in a coal cargo constantly migrates under the dynamic ship motion during maritime transport. The moisture often builds up at the bottom of the cargo. The accumulated water, if not removed sufficiently by the bilge well, can cause safety concerns during a voyage and difficulties during cargo unloading. The study presented in this paper aims to develop a program to investigate the moisture migration within coal cargoes in order to assess and eliminate shipping risks. The moisture migration phenomenon is initially modelled by adopting the classic infiltration theory, and considering the ship motions experienced by bulk carriers. An experimental method is developed to empirically characterise the moisture migration of a coal sample under simulated shipping dynamics. A predictive model is also developed to estimate the total moisture migration in a full size cargo by properly scaling up the experimental results. The model was validated by bilge well log collected from actual coal shipping voyages from Australia to international destinations.     

Models and algorithms for solving combined vehicle and crew scheduling problems with rest constraints : an application to road feeder service planning in air cargo transportation

We present a mathematical model and two algorithms for solving a complex combined vehicle and crew scheduling problem. The problem arises in the area of road feeder service (RFS) for air cargo transportation where cargo airlines engage specifically equipped RFS-carriers to serve so-called lines, i.e. regular weekly patterns of trips starting and ending at the central hub, respectively. The complexity of the problem stems from the time windows, the rest regulations for drivers and the highly heterogenous requirements with respect to the fleet. The model can be applied to different planning scenarios at the RFS-carrier as well as the airline. The model and method has been incorporated into a decision support system called block.buster where sequences of single trips are combined to feasible blocks starting and ending at the hub and then combined to feasible vehicle round trips.     

基于二次开发的液货舱逆向建模技术

逆向建模是逆向工程中的重要环节,激光测量技术的发展及其广泛应用对逆向建模技术提出了更高的要求。以Imageware和UG为开发平台,利用Imageware内嵌的Scoll二次开发语言以及UG/OPEN API技术,结合中长距离激光测量设备,进行液货舱逆向建模技术的探讨。将该项技术应用于液货舱的逆向建模中,为船舶液货舱舱容计算及船舶改造提供一种新的方法。     

基于改进LSTM的航运物流路径轨迹修复研究

目的 提高航运物流路径轨迹信息的挖掘精度和安全效率。方法 对宁波舟山港条帚门水域窄口航道船舶的类型、数量、长度进行统计分析,对货运船AIS物流路径轨迹异常进行识别与修复。考虑船舶实际航行的环境因素,提出一种新的数据纠偏方法。考虑船舶属性与环境因素,以通航宽度和三自由度运动学的转向能力识别异常数据,然后运用Bi-LSTM法对筛选后航运物流路径进行轨迹修复。结果 所提筛选方法不需要轨迹聚类或建立额外的模型进行判别,筛选数据量占总数量的34.26%,修复后的AIS货船物轨迹数据量在原有基础上提升了115.34%。结论 使用文中方法可以有效纠偏和修复异常航运物流路径轨迹数据,为航运物流轨迹数据挖掘提供一定的基础方法。     

The workload balancing problem at aircargo terminals

We consider a large air cargo handling facility composed of two identical cargo terminals. In order to improve the operational efficiency, the workload must be balanced between the terminals. Thus, we must assign each airline served by the facility to one of the terminals such that (ideally): (1) each terminal has the same total workload, and (2) the workload at each terminal is distributed evenly along the timeline. Complicating the problem is that cargo loads are difficult to predict (stochastic). We develop a stochastic mixed integer linear program model in which a weighted sum of the balance measures is minimized. We employ sample average approximation for the stochastic program and develop an accelerated Benders decomposition algorithm to reduce the computational time. The proposed model can also be applied to partially reassign the airlines for the operational schedule changes. The computational results show that a small number of reassignments are often sufficient to rebalance the workload. The simulation results based on data from a large international airport show that the proposed algorithms efficiently balance the workload and the cargo service time is consistently reduced.