Application of Three-Dimensional Visualization Technology in Project Management of Offshore Platform Engineering Construction

Three-dimensional visualization technology converts engineering design drawings and data into graphics or images, realizes virtual reality perception of simulated users in future construction scene, enhances the interaction between project management and technical personnel and engineering construction achievement, and provides intuitive, flexible and strong realistic experience for project management. It can effectively improve the level of project communication, and assist the needs of project construction planning management, training, exhibition, etc. As a tool to help improve project management skills, it has good application effect and prospects.

Application of Three-Dimensional Visual Simulation in Tidal Defense Engineering

Any tidal defense engineering involves the collection and analysis of massive information about engineering structures and their surrounding environment. Traditional method, which is carried out mainly by means of twodimensional drawings and textures, is not efficient and intuitive enough to analyze the whole project and reflect its spatial relationship. Three-dimensional visual simulation provides an advanced technical means of solving this problem. In this paper, triangular irregular network (TIN) model simplified by non-uniform rational B-splines (NURBS) technique was used to establish the digital terrain model (DTM) of a super large region. Simulation of dynamic water surface was realized by combining noise function with sine wave superposition method. Models of different objects were established with different modeling techniques according to their characteristics. Application of texture mapping technology remarkably improved the authenticity of the models. Taking the tidal defense engineering in the new coastal region of Tianjin as a case study, three-dimensional visual simulation and dynamic roaming of the study area were realized, providing visual analysis and visible demonstration method for the management and emergency decision-making associated with construction.

Three-Dimensional Visual Analysis for Construction Layout of Reservoir Project

It is difficult to analyze the inter-relationship for the construction layout of a reservoir project scientifically and intuitively.According to the characteristics of broad field and huge information,the modeling methods of digital terrain and solid model as well as the techniques of texture mapping and scene navigation are adopted.The simulation system is developed by C program language,which includes the functions of the interactive navigation of 3D scene,the visual inquiry of project digital model information,the storage and management of project information.A certain reservoir is taken as a case.The 3D visual analysis for the construction layout and engineering information are obtained.The proposed system is of great advantages in dealing with large amount of information and the method provides a theoretical basis and technical support for the construction layout of a reservoir project.

A three dimensional visualized physical simulation for natural gas charging in the micro-nano pore system

A micro-nano pore three-dimensional visualized real-time physical simulation of natural gas charging, in-situ pore-scale computation, pore network modelling, and apparent permeability evaluation theory were used to investigate laws of gas and water flow and their distribution, and controlling factors during the gas charging process in low-permeability(tight) sandstone reservoir. By describing features of gas-water flow and distribution and their variations in the micro-nano pore system, it is found that the gas charging in the low permeability(tight) sandstone can be divided into two stages, expansion stage and stable stage. In the expansion stage, the gas flows continuously first into large-sized pores then small-sized pores, and first into centers of the pores then edges of pores;pore-throats greater than 20 μm in radius make up the major pathway for gas charging. With the increase of charging pressure, movable water in the edges of large-sized pores and in the centers of small pores is displaced out successively. Pore-throats of 20-50 μm in radius and pore-throats less than 20 μm in radius dominate the expansion of gas charging channels at different stages of charging in turn, leading to reductions in pore-throat radius, throat length and coordination number of the pathway, which is the main increase stage of gas permeability and gas saturation. Among which, pore-throats 30-50 μm in radius control the increase pattern of gas saturation. In the stable stage, gas charging pathways have expanded to the maximum, so the pathways keep stable in pore-throat radius, throat length, and coordination number, and irreducible water remains in the pore system, the gas phase is in concentrated clusters, while the water phase is in the form of dispersed thin film, and the gas saturation and gas permeability tend stable. Connected pore-throats less than 20 μm in radius control the expansion limit of the charging pathways, the formation of stable gas-water distribution, and the maximum gas saturation. The heterogeneity of connected pore-throats affects the dynamic variations of gas phase charging and gas-water distribution. It can be concluded that the pore-throat configuration and heterogeneity of the micro-nanometer pore system control the dynamic variations of the low-permeability(tight) sandstone gas charging process and gas-water distribution features.

Multi-Project in an Integrated BIM Model: Clash Detection and Construction Planning

The Building Information Modelling (BIM) methodology has been adopted in the construction industry, supporting the development of projects. Its implementation has improved the collaboration and integration in the design context, increasing the accuracy of the project preparation and the decreasing additional costs and delays of the construction work. The main objective of the present research is to provide an overview of the state of the art of BIM applications, namely, concerning the construction planning. For that, the generation of a BIM 3D model, involving the disciplines of architecture, structures and water supply system was performed. After, over the model a conflict analysis was applied, in order to verify the consistency of all the disciplines, when linked together. In order to obtain a visual simulation of the construction process, the correspondent 4D BIM model was also generated. Along the development of the study, distinct BIM software was applied over a case study. The main remarks of the capacities of the software, as well as the benefits and limitations verified were identified.

重型施工机械安拆吊装作业视觉可达性BIM仿真分析

为提高重型施工机械安拆吊装作业安全工效,改善安拆作业过程中人员的可视性,提出基于可视锥法的多主体视觉可达性建筑信息模型(BIM)仿真方法。首先,通过重型施工机械视觉任务分解,得到重型施工机械多主体视觉任务;其次,以wk-35型电铲安拆作业为研究对象,分析起重驾驶司机-信号工-司索工多主体视觉任务,运用计算机辅助三维交互应用(CATIA)人因仿真模块,构建安拆吊装作业多主体视觉的BIM仿真场景;然后,采用可视锥法,计算安拆吊装作业过程多主体视觉可达性量值,测度多主体视觉可达性水平,构建重型机械施工机械多主体视觉评价模型;最后,调节BIM模型的过程参数,推演多主体视觉变化趋势,评价安拆吊装作业多主体视觉可达性。结果表明:安拆作业中起重司机在起升下降过程中视觉可达性较差,在平移过程中视觉可达性较好;信号工和司索工的位置与其视觉可达性联系紧密,当信号工处于视野刚好覆盖起重司机和司索工的位置时,其视觉可达性最好,而司索工需不断调整位置,使其视觉可达性达到最佳。

高等医学教育虚拟仿真实训平台的建设现状与思考——基于VOSviewer软件的可视化分析

基于中国知网数据库文献,利用VOSviewer可视化分析软件,从文献数量、发文期刊、发文机构、专业分布、课程分布、教学方法和发展趋势等方面梳理高等医学教育虚拟仿真实训平台的建设现状。由分析得知,虚拟仿真实训平台建设中存在的问题主要是多学科交叉融合不足,可能是限制其发展的主要因素;虚拟仿真实训平台建设集中在护理专业和医学基础相关课程,临床诊疗过程实训相关平台建设明显不足,将来可能会成为新的开发领域。

BIM技术在杭州机场三期项目施工中的应用

本文以杭州市萧山机场三期工程为例,探究了BIM技术在项目施工中的具体应用。使用无人机缩时拍技术获取施工现场的信息,将所得信息输入到Revit、Autodesk Civi3D、Navisworks等BIM软件中,构建三维建筑模型并开展深化设计、施工方案可视化模拟、施工进度模拟,为施工管理提供了帮助。在BIM技术的帮助下,提高了设计效率、加快了施工进度、提升了建设质量,项目建设取得了良好的综合效益。

用Visual C^(++)实现工作面地层构造的可视化

介绍了在Visual C++6.0的平台下,采用面向对象的三维建模方法,实现煤矿工作面地层构造的三维动态模拟显示的方法,结果表明该种处理方法是一种比较可行的方法,为数字化矿山建设打下一定的基础。

基于3DE的混凝土坝施工进度仿真动态可视化

混凝土坝施工进度常采用计算机仿真技术进行模拟,一般以大坝三维模型作为可视化表达载体,设计和施工仿真阶段模型颗粒度要求不同,模型数据和仿真结果交互不便,施工进度仿真可视化交互性不强。为实现不同阶段混凝土坝模型快速建模、模型属性和仿真数据关联应用、进度仿真可视化展示的高度集成和交互,提出了一种基于3DE的混凝土坝施工进度仿真动态可视化方法,并研发了混凝土坝模型快速分割、属性批量计算提取与数据交互、施工进度仿真动态展示等工具,最后以旭龙水电站混凝土拱坝为例进行实际应用并取得了良好的效果。结果表明:此方法具有操作简单、数据无损复用和可视化效果好的优势,可为混凝土坝施工仿真进度动态可视化研究提供新的思路。

智能变电站施工仿真系统的可视化设计与实现

为了提高传统智能变电站施工仿真系统的稳定性,设计一种基于SCD的智能变电站施工可视化系统。通过核心控制器W5100芯片的智能终端模块,对系统中的状态信息以及设备信息进行存储以及控制,通过合并单元模块实现一次系统仿真模块同二次仿真模块之间的连接,利用SCD可视化模块实现智能变电站施工的可视化。实验结果表明,所设计系统具有仿真准确性高、稳定性好、效率高等特点,综合性能优良,达到了可视化的要求,能够显著提高智能变电站的施工效率。

基于虚拟现实的施工进度三维可视化模拟系统

当前建筑施工进度多使用二维系统进行可视化显示,并且在可视化模拟过程中,未计算各工序的施工工期,导致施工进度模拟效果较差。为此,设计基于虚拟现实技术的施工进度三维可视化模拟系统,通过功能模块层、业务逻辑层和应用系统层构建总体架构。其中,功能模块层由施工监测图像采集模块、图层管理模块、工序排布与工期估算模块,以及虚拟现实场景可视化展示模块组成。通过鱼眼摄像头采集施工监测图像,采用小波阈值方法对采集到的施工监测图像进行去噪处理,根据图像预处理结果,计算出各工序的施工工期,获取施工进度,构建三维虚拟展示场景模型,对施工进度进行虚拟现实场景可视化展示。实验结果表明,该系统进行高层建筑工程施工进度三维可视化模拟的精度较高,模拟时间较短,且施工进度的效率较高。

Theory and practice of construction simulation for high rockfill dam

Construction simulation for high rockfill dam (CSHRD) is the technology that takes advantage of computer simulation to observe and analyze a complex construction process, which is useful for construction design and management. In this paper, the domestic and oversea research status of CSHRD is reviewed firstly, along with introduction of their present achievements and deficiencies, and the CSHRD theory is also described. Then, considering the influence of many stochastic factors, integrated simulation for high rockfill dam construction (HRDC) is presented with technologies of cycle operation network (CYCLONE) and computer simulation. It rationally combines two subsystems in HRDC, namely haulage and placement of rockfill subsystem, which reflects the actual construction objectively. Important parameters, such as the haulage intensity and traffic density, are obtained, and the process of CSHRD is represented intuitively in dynamic visualization. All of these help engineers to make rapid decisions in HRDC scientifically.

Construction Management Utilizing 4D CAD and Operations Simulation Methodologies

The paper presents applications of simplified discrete-event simulation (SDESA), and 4D-GCPSU, to the National Stadium of the Beijing 2008 Olympics. Taking into account influential factors, e.g., resource, spatial condition, and the randomness of the construction process, the installation process of the steel-structure was simulated and optimized by using genetic algorithm (GA) optimization methodology. The operations simulation shortened the installation duration by 39 days (about 16% of the original total duration), guided the manufacturers to plan the construction processes, and provided specific suggestions on the entry time of the installation components, resulting in resource allocation optimization, resource saving, and construction efficiency improvement. Combining with the optimized schedule, the 4D visualization environment can discover time-space conflicts timely, and may assist project managers to reschedule the construction activities in tune with the site layout and resource allocation.

水利水电工程灌浆施工技术探究

针对水利水电工程灌浆施工问题,探讨可视化仿真技术在水利水电施工中的应用,并结合具体工程案例对灌浆施工中可视化仿真技术的应用进行详细阐述,主要从帷幕灌浆施工过程以及帷幕灌浆质量检测两方面进行分析。

BIM可视化技术在房建施工模拟管理中的应用

为提高施工效率,降低施工成本,确保施工质量,文章主要采取文献综述和案例分析的方法,探究了BIM可视化技术在房建施工模拟管理中的应用方法及策略。研究发现,有必要从设计阶段、施工阶段着手,加大BIM可视化技术在房建施工模拟管理中的应用力度,从而更好地达到预期的施工管理效果。文章研究成果可推动BIM技术在房建施工管理中的应用。

高速数据建造、仿真及过程监控集成测试系统设计

文章提出了一种集数据建造、仿真、过程监控于一体的测试系统架构。该测试系统不仅具有普通测试设备模拟外设对星载计算机进行一对一功能测试的能力,还能够模拟真实的测试环境产生测试数据以提高产品测试的真实性,并且在系统级测试中监控星载计算机、载荷之间的整个测试过程,快速定位系统级测试中出现的问题。该测试系统可以有效地解决测试环境不全面以及系统测试中测试过程不透明的问题,提高了产品测试的效率。

基于GIS的水电工程施工导流三维动态可视化

为直观逼真地描述水电工程施工导流各环节之间复杂的动态时空逻辑关系 ,提出基于 GIS的施工导流三维动态可视化方法 ,构造了施工导流三维动态数字模型 ,并在此基础上实现了模型的动态显示、交互操作、空间分析以及施工导流全过程可视化仿真等功能 ,从而为水电工程施工组织设计与宏观决策提供了一个科学有效的可视化分析手段 .最后给出一个工程应用实例 ,表明文中方法具有较好的实用性 .

构建矿井通风可视化仿真系统的关键问题研究

近几年来矿井通风安全管理系统在国内成为研究的热点,而且已经取得了非常重要的成就,但是在构建矿井通风可视化仿真系统方面还有一些关键问题和技术需要解决和完善。本文分析了矿井通风安全管理系统的开发现状、趋势,并对构建矿井通风可视化仿真系统的关键问题进行了分析与研究,并给出了相应的解决办法,这对于构建矿井通风可视化仿真系统或改进现有矿井通风管理系统具有一定的促进作用和参考价值。

基于实时监控的碾压混凝土坝仓面施工仿真可视化分析

结合系统仿真技术、实时监控技术、数据库技术和可视化技术,开展碾压混凝土坝仓面施工仿真可视化分析研究,构建仓面施工精细仿真模型。该模型不仅可以通过仿真计算获得详细的仓面施工进度信息,而且实现了可交互的仓面施工三维动态可视化分析。研究成果已应用于西南某碾压混凝土坝工程。