面向内容的三维模型数据库设计及其检索系统的实现

目前,对基于内容的三维模型检索的研究主要集中在检索过程所涉及到的算法方面,而对三维模型库的设计研究较少.为此,详细分析了面向内容的三维模型库的建立过程,重点论述三维模型库的组织结构和分类表的设计,提出一种三维模型分类的手工构造方法,开发了三维模型库的管理软件,并研制了三维模型检索的原型系统.其意义在于为三维模型检索研究提供一个结构合理、数据充分的三维模型库,从而为检索算法的研究奠定坚实的基础.     

基于ObjectARX的木线花纹三维建模

借助AutoCAD环境,基于ObjectARX研究快速地建立木线花纹模型。从规则二维花纹入手,通过尝试将平面花纹中的点、线替换成简单三维实体来建立三维模型。木线花纹不同于自然景物的模拟,建模方法主要是将平面花纹生成技术转换到三维设计上来。     

浅析虚拟仿真系统的三维模型构建应用

虚拟仿真校园漫游技术是虚拟技术其中的一支分支。虚拟仿真是依靠计算机软硬件的强大支持才得以实现。虚拟仿真离不开三维模型的支持,三维模型不仅应用于影视动画、建筑设计和工业设计中,越来越多的应用于人工智能、游戏、3D打印、教育等新兴产业。该文通过阳光学院虚拟仿真校园漫游系统来研究三维模型的创建和优化,以及三维模型在虚拟仿真技术中的应用模式。     

融合制造语义的三维工序模型序列重用方法

针对目前三维工序模型序列重用缺少对加工特征尺寸、加工精度、形位公差等制造信息的考虑,不能很好地支持零件制造过程工艺设计重用的问题,提出一种融合制造信息的三维工序模型序列重用方法.首先,利用图同构原理对工艺路线中三维工序模型序列进行优化,减少搜索空间;然后,利用子图同构对三维工序模型加工特征进行匹配,通过融合制造信息对加工特征匹配进行预处理和相似性评价,以获取具有最相似加工特征的三维工序模型;其次,设计三维工序模型序列优化算法获取同构的三维工序模型序列;最后,以某型轴零件工艺设计过程为例进行实例验证,结果表明融合制造信息的三维工序模型序列重用方法能够准确地根据指定制造特征进行工艺设计重用,具有良好的应用效果.     

基于VRML与JavaScript三维模型的交互设计

介绍了VRML技术在三维模型交互设计的应用,分析了VRML与JavaScript相结合的可控性效果．从而使三维模型可进行动态观察,并与用户产生交互。以一品牌冰箱为例,利用3dmax创建模型,结合vrml中的Touchsens节点和JavaScript脚本来实现对冰箱模型的交互。     

笔式三维草图绘制中的轮廓线技术研究*

详细介绍了三维模型轮廓线技术及其检测算法,并深入分析了轮廓线技术在三维草图绘制中的作用;然后设计并实现了一个三维草图绘制系统。该系统提供了用笔绘制三维模型的交互环境,通过轮廓线将三维模型与二维交互手势联系起来,使用户可以自由灵活地操纵和控制三维模型,获得自然、高效的交互体验。     

交互式三维对象建模方法研究与实现

论文设计了一种交互式三维对象建模方法,为非专业三维应用开发人员提供了一个友好的三维图形开发应用平台。研究了三维对象模型的概念模型和逻辑模型,分析了三维对象模型拓扑关系的存储方式和查询方式;提出了关系模型,设计出三维对象模型与关系模型间的相互作用方式;采用模型库保存常用的基本模型和关系模型,用户也可按需求自定义对象模型和关系模型,并扩充模型库,使得模型具有较好的可重用性;结合OSG三维图形引擎,验证了提出的交互式三维对象建模方法的可行性。     

交互式三维对象建模方法研究与实现

论文设计了一种交互式三维对象建模方法,为非专业三维应用开发人员提供了一个友好的三维图形开发应用平台.研究了三维对象模型的概念模型和逻辑模型,分析了三维对象模型拓扑关系的存储方式和查询方式;提出了关系模型,设计出三维对象模型与关系模型间的相互作用方式;采用模型库保存常用的基本模型和关系模型,用户也可按需求自定义对象模型和关系模型,并扩充模型库,使得模型具有较好的可重用性;结合OSG三维图形引擎,验证了提出的交互式三维对象建模方法的可行性.     

基于OpenGL的立体车库三维仿真系统实现

搭建了基于OpenGL图形库及UDP协议的软硬件仿真平台,分析了系统中的双缓存技术、三维模型读取、模型数据驱动、可变视点等关键技术,设计了立体停车库可视化仿真系统。该系统实现了模拟仿真立体车库出入库三维场景,设备运行效率统计等功能。     

基于Web的三维协同设计模型及其关键技术

为在虚拟环境下进行产品异地实时设计和装配,提出一种基于Web的三维协同设计模型.该模型使用户既可以通过浏览器在客户端的虚拟场景中进行个性化设计,也可以与其他用户进行协同设计.通过详细分析协同设计过程,研究任意形状基本实体的表征、零件扩展属性的描述、基本操作的表示、零件之间装配关系和部件运动仿真属性等的建立.基于ACIS和ECSG的三维造型技术和层次细节模型的生成算法,研发以某产品为对象的原型系统,证实该三维协同设计模型的可行性和先进性.     

Model-based design of supervisory controllers for baggage handling systems

The complexity of airport baggage handling systems in combination with the required high level of robustness makes designing supervisory controllers for these systems a challenging task.We show how a state of the art, formal, model-based design framework has been successfully used for model-based design of supervisory controllers for an actual industrial baggage handling system, and for a real-time emulation model of an actual international airport.The high level modeling elements of the applied CIF model-based design framework allow the modeler to concentrate on implementing the baggage handling system design requirements, instead of programming PLC code. It also allows a modular and hierarchical design of the supervisory controller, and provides flexibility in adapting and extending the model. Validation of the controller and the uncontrolled plant by means of simulation and visualization made it possible to catch all modeling errors, leading to very short modeling, testing and error correction iteration loops.To the best of our knowledge, this is the first successful employment of formal, model-based design in the context of supervisory control for actual, industrial size baggage handling systems, that covers the entire development process from requirements up to and including validation, real-time PLC code generation and implementation.We give an overview of the model-based design framework, discuss several modeling issues, and analyze the results of the industrial applications. We do not go into full technical detail, due to nondisclosure agreements, but tell the story, and give lessons learned that we consider useful for practitioners.     

SCADA在机场行李处理系统中的运用

在进行分析数据采集与监视控制（SCADA）系统结构的基础上,通过文字和图表阐述SCADA在机场行李处理系统中的控制原理,并深入剖析了SCADA在民用机场行李处理系统（BHS）中的功能与应用,同时以实际应用介绍机场行李处理系统基于WinCC技术的SCADA系统解决方案.     

A simulation approach to modelling baggage handling systems at an international airport

The baggage handling system is a critical component of an airport’s operations, coordinating many different elements and agents in different areas of the facility. Due to the complexity of their interrelationships, an effective analysis of the impact of different operating strategies on the system must consider these elements and agents not in isolation from each other but rather as an integrated whole. This paper presents a microscopic simulation model for a baggage handling system that fully integrates all baggage-related subsystems. These include passenger arrival to check-in queues, baggage check-in, security screening, sorting, transport to the aircraft and loading. Under this approach, not only the individual subsystems but also their interactions can be simulated and studied. The proposed simulator is applied to the case of Santiago International Airport in Chile where passenger demand has grown beyond the existing baggage handling system’s operating capacity. The principal contributions of this study are the extension and adaptation of a vehicle traffic simulator software to the baggage handling problem and the development of a platform that models baggage handling as an integrated unit. The tool is applied to the analysis of the overall system and its components under a number of different real-world scenarios. In this application, the movement of bags and their interactions with the rest of the system are simulated in great detail for a given period. This level of granularity permits the simulator to analyse accurately the effects of different scenarios and how they are propagated through the system.     

基于WinCC的机场行李监控系统

根据机场行李处理系统的监控要求,提出机场行李监控系统的基本框架并设计基于Win CC的机场行李监控系统。     

基于表面深度值均方差的航空行李分类研究

以航空旅客行李托运方式的国际标准为出发点,研究了基于行李表面深度值均方差的分类方法,为采取何种方式托运提供依据。采用Kinect传感器在行李输送带上方采集深度图像,提取行李区域的像素值并计算其均方差进行粗分类;结合行李三维形态的先验知识,根据网格之间的距离以及深度值均方差的差异,设计了基于网格相似度的自适应聚类算法,拟合聚类结果中高层单元的面积和数量,分析行李三维形态特征,确定其类别。实验结果表明,所提算法复杂度低,能快速准确地识别行李类别。     

机场行李分拣及X光安检联动控制研究

针对机场行李分拣系统在集成X光集中安检系统时存在行李处理效率低及系统可靠性不足等问题,提出了一种行李分拣及X光安检联动控制方案.组态化设计了可靠性高的行李分拣及X光安检联动控制系统的硬件结构.深入研究了行李到位检测、集中安检控制时序关键问题.详细设计了具有较高处理效率的X光安检联动控制程序的整体流程,并在西门子SIMA...     

3维地理信息系统数据模型的设计

空间数据模型是地理信息系统设计的核心和基础。该文详细地介绍了在实际工作过程中设计的一种面向对象的3维数据模型，供大家参考。该数据模型有很强的可扩充性，十分灵活。     

Simulation-based baggage handling system merge analysis

This paper details the investigation into the design and control of merging bottlenecks of conveyor-based baggage handling systems, encompassing the merging control algorithm and the impact of the merge’s physical layout. A methodology for the analysis of simulation model results is presented. Results show that the layout of the merge influences bag throughput and when the physical configuration is in a preferred position, input variance has no effect on bag throughput performance. These results have potential application to other material handling systems, such as those used in manufacturing and warehousing.     

Baggage handling postures and the design of conveyors

The main purpose of this study was to determine the height, angle and velocity of conveyors for baggage handling at Schiphol Airport. These variables have a great influence on the postures and workload of baggage handlers. One hundred and seven healthy male baggage handlers participated in a test, during which a regular baggage handling task was simulated with a mock-up. Eighteen combinations of heights, angles and velocities were tested. Data on postures were collected with the aid of task recording and analysis on computer (TRAC). The minimal volume of open space under the conveyor was determined with light cells that scored the positions of legs and feet of the subjects. In addition, opinions from the baggage handlers were gathered with a questionnaire, immediately after the test. Finally the number of selection errors made and the number of bags that fell off the conveyor were noted, to make sure that ergonomics improvements did not reduce the quality of baggage handling. On the basis of these three information sources, alternative conveyor dimensions were recommended, which are expected to improve the working conditions of the baggage handlers, without any reduction in the quality of work.