Construction Scheduling and Progress Control Using Geographical Information Systems

Traditional scheduling and progress control techniques such as bar charts and the critical path method (CPM) fail to provide information pertaining to the spatial aspects of a construction project. A system called PMS-GIS (Progress Monitoring System with Geographical Information Systems) was developed to represent construction progress not only in terms of a CPM schedule but also in terms of a graphical representation of the construction that is synchronized with the work schedule. In PMS-GIS, the architectural design is executed using a computer-aided drafting (CAD) program (AutoCAD), the work schedule is generated using a project management software (P3), the design and schedule information (including percent complete information) are plugged into a GIS package (ArcViewGIS), and for every update, the system produces a CPM-generated bar chart alongside a 3D rendering of the project marked for progress. The GIS-based system developed in this study helps to effectively communicate the schedule∕progress information to the parties involved in the project, because they will be able to see in detail the spatial aspects of the project alongside the schedule.     

SolidWorks三维造型在机械制图综合实践中的应用

介绍了SolidWorks在机械制图综合实践中的应用,让学生利用SolidWorks软件,密切联系工程实践,将三维建模与二维工程图样紧密结合到一起,增强学生使用计算机辅助设计的能力,达到机械制图综合实践的目的.     

棉纺细纱后区牵伸型式的演变与发展(一)

为说明后区牵伸运用原则,从后区牵伸中纱条紧密度测定、有捻粗纱的匀伸作用、牵伸力与输出纱条不匀关系测定、不同牵伸分配、不同粗纱捻系数下前区牵伸力测定等方面分析,指出后区牵伸为前区主牵伸创造良好的牵伸条件;其实质是使喂入前区的牵伸纱条具有较均匀结构和必要紧密度,它产生的内摩擦力场强度与前区外摩擦力场强度分布相配合,共同形成胶圈牵伸良好而稳定的总摩擦力场强度分布,有利于成纱质量的提高;表明在此前提下,后区适当承担总牵伸的一部分可以减轻前区牵伸过大的负担,这就是后区牵伸运用原则。对罗拉直线牵伸、罗拉曲线牵伸和胶圈牵伸等各种后区牵伸型式进行了摩擦力场强度分布分析比较,指出单控制辊式VC型曲线牵伸是后区牵伸型式的重大突破和发展,可发挥前、后区牵伸潜力,其总牵伸能力达50～150倍,成为第三代大牵伸新水平,是后区牵伸型式技术进步的标志。     

RSB-D401型单眼高速并条机的性能和使用(二)

介绍RSB-D401型单眼高速并条机技术特征,阐述其产品适应性、新型牵伸装置、高效吸风系统、自调匀整装置、棉条质量监控系统等先进功能及传动特点,重点解析该机车速、定量、牵伸、隔距、加压、凹凸罗拉宽度等主要工艺参数的优选。说明了该并条机具有高速、高效特性,可适应多品种,配备的在线自调匀整、质量监控系统,可以自动生头,吸尘落筒,实现条筒运输自动化及大卷装,可大大减少人工,提高质量。     

重加压工艺的理论与实践（二）

为了探讨重加压工艺的理论依据,全面分析了牵伸罗拉加压的作用,罗拉加压力与成纱质量的关系及重加压工艺的发展,指出罗拉加压是钳口握持力的最基本、最积极因素,后罗拉加压对牵伸过程控制力作用不大,前罗拉压力是前钳口引导力的关键。罗拉加压对胶圈、胶辊的滑溜率和速度不匀率影响显著。牵伸装置罗拉加压与成纱质量密切相关,前罗拉加压主要是保证成纱条干均匀度;后罗拉加压主要是保证成纱重量不匀率;胶圈罗拉加压主要是保证胶圈运行速度的正确与稳定;因此,压力分布的合理与适当提高是增大牵伸、改善成纱质量的基础。现代牵伸装置的主要特征体现在重加压工艺的发展上。     

一种提高并条机出条速度的方法研究

科技的发展进步要求并条机能够实现高速化,但国内并条机大都达不到高速化要求,因此需研究一种提高并条机出条速度的方法.首先提出一种通过增大牵伸机构前罗拉直径以提高出条速度的方法,接着通过对并条机牵伸机构牵伸性能的分析计算,验证该方法的可行性和对牵伸性能的影响程度,最后采用Ansys软件进行前罗拉的模态分析,得到前罗拉的前六...     

GB／T20564．2—2006汽车用高强度冷轧双相钢国家标准制订情况介绍

介绍了GB／T20564．2—2006汽车用高强度冷轧双相钢国家标准的制订原则,及其主要技术内容。     

Interactive 3D CAD for Effective Derrick Crane Operation in a Cable-Stayed Bridge Construction

The high expectation of esthetic and functional quality in modern civil infrastructure has resulted in the increased demand for long span bridges. In advanced or developing countries, long span bridges such as cable-stayed and suspension bridges are considered even as landmarks that symbolize the prosperity or culture of the region. These long span bridges require higher level of design and construction technologies than other types of bridges. In particular, the construction of cable-stayed bridges involves precise and sophisticated operation of construction equipment such as derrick cranes. However, it is not easy to plan the operations of a derrick crane before the actual construction process takes place. Unexpected spatial constraints in the construction site may hinder the smooth operation of a derrick crane, which leads to lower than expected productivity and safety. This study applies interactive three-dimensional (3D) computer aided design (CAD) to the derrick crane operation for the purpose of identifying potential problems. Construction managers can have the two way process with the 3D CAD system to interactively test their construction plans and scenarios. The case study shows that the interactive 3D CAD system significantly improves the constructability of the cable-stayed bridge construction.     

建筑教育面对当前若干问题的思考与对策

作者对建筑教育当前面临的、带有普遍性的三个问题进行了认真思考,并结合东南大学建筑系的实际提出了相应的对策：1．对保证生源质量的思考与对策;2．对电脑绘图渗透建筑设计领域的思考与对策;3．对毕业班教学受外部冲击的思考与对策。     

建筑图学CAI课件的特点及作用

根据建筑类专业的特色,在图学学科教学内容和手段更新的阶段,研制CAI课件,突出了建筑形体的表达,经过教学实践起到很好的作用,为对课件的进一步完善和再创新奠定了基础.