浅析BIM在建筑工程岩土勘察三维虚拟现实可视化中的应用

将BIM技术运用在岩土工程勘察成果的三维可视化中,主要是指建立建筑信息模型,将三维数字技术作为技术条件,融合建筑工程项目勘察的各项成果,可以发挥出岩土工程勘察成果的最大价值,保障后续工程项目设计、施工的科学合理。基于此,文章针对BIM技术在岩土工程勘察三维虚拟现实可视化中的应用现状进行阐述,并分析存在的问题、提出了相关建议,以供参考。

战场电磁态势的沉浸式虚拟现实及其应用

准确掌握战场电磁态势不仅是实施电子对抗指挥控制的重要基础，而且也是大规模多兵种联合作战的必要条件。针对战场电磁态势的可视化呈现问题，首先分析了以计算机平面显示器为主的传统电子沙盘显示方式所存在的不足，然后将沉浸式虚拟现实与分布式虚拟现实技术相结合，在构建虚拟三维沙盘的基础上，把各种战场电磁态势要素与相关信息以三维图形、图像、文字等方式叠加显示于虚拟沙盘之中，用户通过虚拟现实设备沉浸于其中，并与之进行高效交互，从而准确、全面、有效地获得所关注区域的电磁态势。最后总结了该技术所具有的优势，并探讨了在电子对抗领域中的应用。这对于电子战新型人机交互方式的研发与虚拟现实技术在电子战领域中的应用提供了重要参考。

利用高分辨率影像建立三维虚拟校园——以“数字成都理工大学”为例

以数字化校园工程———“数字成都理工大学”为例,探讨利用航空影像和数字摄影测量技术,获取基础空间地理信息的方法及途径。并采用三维建模软件Cyber C ity对建筑物进行三维建模。而对于复杂地物,采用三维地理信息系统IMAGIS软件建立单个模型,从而实现了成都理工大学校区的三维可视化虚拟重建和漫游。实践证明,利用数字摄影测量技术和遥感影像,能够有效地获取大范围区域地表地物的三维信息,并快速地建立地面模型和三维景观。

基于统计过程控制技术的项目管理可视化控制系统

概述IMCS-SPC模型的总体框架、组成部分以及两大核心技术(多变量统计过程控制技术和虚拟现实可视化技术);详细讨论项目管理者构建IMCS-SPC模型的基本步骤。作为一种采用多元统计分析进行过程控制的可视化决策支持系统,IMCS-SPC为项目管理者提供了一种十分清晰、直观的过程控制方法和工具,可有效提高项目管理效率,以确保项目过程的正常运行。

煤矿采掘计划编制研究

本文介绍了采掘计划编制与检验的采掘平衡理论,提出了进行矿井采掘计划编制与检验的可视化与虚拟现实模拟研究的主要内容和关键技术。

Visualization of flatness pattern recognition based on T-S cloud inference network

Flatness pattern recognition is the key of the flatness control. The accuracy of the present flatness pattern recognition is limited and the shape defects cannot be reflected intuitively. In order to improve it, a novel method via T-S cloud inference network optimized by genetic algorithm(GA) is proposed. T-S cloud inference network is constructed with T-S fuzzy neural network and the cloud model. So, the rapid of fuzzy logic and the uncertainty of cloud model for processing data are both taken into account. What's more, GA possesses good parallel design structure and global optimization characteristics. Compared with the simulation recognition results of traditional BP Algorithm, GA is more accurate and effective. Moreover, virtual reality technology is introduced into the field of shape control by Lab VIEW, MATLAB mixed programming. And virtual flatness pattern recognition interface is designed.Therefore, the data of engineering analysis and the actual model are combined with each other, and the shape defects could be seen more lively and intuitively.

Design and Implementation of a 3D Ocean Virtual Reality and Visualization Engine

In this study,a 3D virtual reality and visualization engine for rendering the ocean,named VV-Ocean,is designed for marine applications.The design goals of VV-Ocean aim at high fidelity simulation of ocean environment,visualization of massive and multidimensional marine data,and imitation of marine lives.VV-Ocean is composed of five modules,i.e.memory management module,resources management module,scene management module,rendering process management module and interaction management module.There are three core functions in VV-Ocean:reconstructing vivid virtual ocean scenes,visualizing real data dynamically in real time,imitating and simulating marine lives intuitively.Based on VV-Ocean,we establish a sea-land integration platform which can reproduce drifting and diffusion processes of oil spilling from sea bottom to surface.Environment factors such as ocean current and wind field have been considered in this simulation.On this platform oil spilling process can be abstracted as movements of abundant oil particles.The result shows that oil particles blend with water well and the platform meets the requirement for real-time and interactive rendering.VV-Ocean can be widely used in ocean applications such as demonstrating marine operations,facilitating maritime communications,developing ocean games,reducing marine hazards,forecasting the weather over oceans,serving marine tourism,and so on.Finally,further technological improvements of VV-Ocean are discussed.

From Physical Space to Visual Image Space

The theoretical framework of visual simulation in virtual reality is discussed. The new concept of visual image space is supposed. On the basis of visual image space, in visual perceptive sense, VR is considered as a spatial simulation. The objective of the spatial simulation is to transform physical space to visual image space. Last, the prototype system, surveying & mapping virtual Reality (SMVR), is developed, and the space simulation above is realized. By use of SMVR, the real 3D representation, 3D visual analysis, virtual plan and designs can be implemented.

Application of quaternion in visual simulation of rigid body motion

In recent years,with the extensive applications of high performance computer and the rapid development of the attitude control of the spacecraft,quaternion theory has been widely used.Compared with Euler angles,quaternion not only is simple calculation,but also can avoid the singularity problem of Euler angles,therefore it is widely used in the attitude control of spacecraft.In this paper,Simulink simulation technology is used to establish a rigid attitude simulation model with quaternion method and virtual reality scene by virtual reality modeling language(V RM L)is used to achieve attitude motion visualizationThe simulation results show that the Simulink simulation model can accurately reflect the attitude motion of the rigid body,which is valuable for the research of the attitude control of the spacecraft.

Smart Modeling of Maritime Vessels

Currently, the market offers many visualization tools available to graphic designers, engineers, managers and academics working on maritime environments. The practice of visualization involves making and manipulating images that convey novel phenomena and ideas. Visual communication, together with virtual reality environments, is an emerging and rapidly evolving discipline. It brings great advantage over written word or voice alone, as visual sense is by far the most dominant component of human sensory perception. A new smart approach for modeling maritime vessels is described in this paper. Various ways of making modeling relevant for work within the field of maritime management, training and education are discussed.

Virtual Reality and Visual Simulation Technology in Platform Construction with Four Bucket Foundations Based on Secondary Development of Vega

The platform with bucket foundations can penetrate and migrate by underpressure/positive pressure technique caused by pumping water out/in the bucket. However, the construction process of bucket foundations cannot be clearly observed and effectively controlled due to the special nature of sea environment. By using an advanced simulation development tool of Multigen Creator, the visual construction simulation program for the platform with bucket foundations was developed to set up the virtual reality system with interaction control and observation in every view angle based on the secondary development technology of Vega platform. The application results show that the method is feasible and effective by simulating the whole construction process for the platform with four bucket foundations.

GPU Accelerated Marine Data Visualization Method

The study of marine data visualization is of great value. Marine data, due to its large scale, random variation and multiresolution in nature, are hard to be visualized and analyzed. Nowadays, constructing an ocean model and visualizing model results have become some of the most important research topics of ‘Digital Ocean'. In this paper, a spherical ray casting method is developed to improve the traditional ray-casting algorithm and to make efficient use of GPUs. Aiming at the ocean current data, a 3D view-dependent line integral convolution method is used, in which the spatial frequency is adapted according to the distance from a camera. The study is based on a 3D virtual reality and visualization engine, namely the VV-Ocean. Some interactive operations are also provided to highlight the interesting structures and the characteristics of volumetric data. Finally, the marine data gathered in the East China Sea are displayed and analyzed. The results show that the method meets the requirements of real-time and interactive rendering.