Teaching Practice of Architecture Courses based on Virtual Simulation

Virtual simulation teaching of architecture courses is a teaching mode based on the deep integration of information technology and design class in intelligent environment.Under the background of new engineering,relying on a national virtual simulation laboratory,the exploration of green low-carbon simulation in architecture courses is of great importance for improving the dimension of scientific thinking of architecture undergraduates.In this study,based on the background of architecture curriculum construction,the practical content of the teaching reform of architecture courses based on virtual simulation was expounded from three dimensions of reshaping teaching objectives,updating teaching content and improving teaching evaluation.The practical paths of teaching reform of architecture courses were put forward under virtual simulation experiment teaching,namely building teaching teams,strengthening pilot courses,reforming teaching methods,optimizing classroom teaching content and evaluation methods,constructing practical classroom teaching form in line with the learning situation of architecture courses,building a smart learning platform,and closely combining resource construction,application and curriculum content.This study has important practical significance for optimizing and improving the teaching system of professional courses,adapting to the needs of the industry,enhancing competitiveness,and promoting the construction of first-class architecture courses.

Model architecture-oriented combat system effectiveness simulation based on MDE

Combat system effectiveness simulation (CSES) is a special type of complex system simulation. Three non-functional requirements (NFRs), i.e. model composability, domain specific modeling, and model evolvability, are gaining higher priority from CSES users when evaluating different modeling methodologies for CSES. Traditional CSES modeling methodologies are either domain-neutral (lack of domain characteristics consideration and limited support for model composability) or domain-oriented (lack of openness and evolvability) and fall short of the three NFRs. Inspired by the concept of architecture in systems engineering and software engineering fields, we extend it into a concept of model architecture for complex simulation systems, and propose a model architecture-oriented modeling methodology in which the model architecture plays a central role in achieving the three NFRs. Various model-driven engineering (MDE) approaches and technologies, including simulation modeling platform (SMP), unified modeling language (UML), domain specific modeling (DSM), eclipse modeling framework (EMF), graphical modeling framework (GMF), and so forth, are applied where possible in representing the CSES model architecture and its components' behaviors from physical and cognitive domain aspects. A prototype CSES system, called weapon effectiveness simulation system (WESS), and a non-trivial air-combat simulation example are presented to demonstrate the methodology.

Integration of naval distributed tactical training simulation system based on advanced message queuing protocol

Aiming at the problems of unreliable data transmission,poor steadiness,nonsupport of complex data types,direct couple between data transmission and exchange,a high-level method based on advanced message queuing protocol( AMQP) is proposed to integrate naval distributed tactical training simulation system after serious consideration with current information exchange features of military combat system. Transferring layer in traditional user datagram protocol is implemented by publishing and subscribing scheme of message middleware. By creating message model to standardize message structure,integration architecture is formulated to resolve potential information security risks from inconsistent data type and express data transmission. Meanwhile,a communication model is put forward based on AMQP,which is in the center position of the whole transmission framework and responsible for reliably transferring battlefield data among subsystems. Experiments show that the method can accurately post amounts of data to the subscriber without error and loss,and can get excellent real-time performance of data exchange.

Computer Simulation on Quasi-ellipsoidal Gear Transmission

Quasi-ellipsoidal gear transmission mechanism, which is the newest transmission mechanism used for robot flexible wrist at present, has simple structure, light weight,small dimension, high sensitivity and can accurately carry out the motion transmission in all-direction. It is a new type of transmission used for robot flexible wrist at present. Different from ordinary transmission mechanisms it is a spatial mesh with double DOF. Its design is complicated, and there are many approximate treatments in checking interference of flank and distribution of teeth. The purpose of this paper is to verify the reliability of the design by means of computer simulation.

A Molecular Dynamics Simulation for Periodic Boundary Condition in the Bending Process of Ag／Ni Composite Interfaces

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Multiprocessing and Dataflow Processing Architecture of a Pixel Processor and Its VHDL Simulation Strategy

The design of a pixel processor of a real-time CIG (Computer Image Generation) system is summarized. The system has been brought into use. In order to adopt ASIC (Application-Specific integrated Circuit) technology in the design of the new system, the VHDL (Very high speed integrated circuit Hardware Description Language) is used and a re-design and simulation strategy is planed.

Numerical Simulation of Al-Si Alloys Filling in EPC Processes

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Multi-relaxation-time lattice Boltzmann simulations of lid driven flows using graphics processing unit

Large eddy simulation （LES） using the Smagorinsky eddy viscosity model is added to the two-dimensional nine velocity components （D2Q9） lattice Boltzmann equation （LBE） with multi-relaxation-time （MRT） to simulate incompressible turbulent cavity flows with the Reynolds numbers up to 1 × 10^7. To improve the computation efficiency of LBM on the numerical simulations of turbulent flows, the massively parallel computing power from a graphic processing unit （GPU） with a computing unified device architecture （CUDA） is introduced into the MRT-LBE-LES model. The model performs well, compared with the results from others, with an increase of 76 times in computation efficiency. It appears that the higher the Reynolds numbers is, the smaller the Smagorinsky constant should be, if the lattice number is fixed. Also, for a selected high Reynolds number and a selected proper Smagorinsky constant, there is a minimum requirement for the lattice number so that the Smagorinsky eddy viscosity will not be excessively large.

MVSim:面向VLIW多核向量处理器的快速、可扩展和精确的体系结构模拟器

设计了一个面向VLIW多核向量处理器的快速、可扩展、精确的体系结构模拟器MVSim。设计了可扩展的VLIW多核向量处理器模型、多级存储体系结构模型和多核性能模型;实现了指令集架构的节拍精准模拟,Cache、DMA和多核同步部件的高效功能模拟,采用多线程技术实现了多核处理器的高效和可扩展模拟。实验结果表明,MVSim能够准确模拟多核处理器的目标程序执行,模拟结果完全正确,具有良好的可扩展性。MVSim的平均模拟速度分别是RTL模拟和CCS的227倍和5倍,平均性能误差约为2.9%。

虚拟仿真实验在无障碍设计教学中的应用——以无障碍通用标识环境设计实验为例

国际上建筑学无障碍设计理论已进化到通用设计等人性化设计思潮,我国部分高校也建立了无障碍设计教学体系。专业课程中实验教学让学生体会无障碍设计的重要性,但传统无障碍模拟体验难以满足所有学生开展综合性设计实践学习的需求。无障碍通用标识环境设计虚拟仿真实验平台引用“循证设计”的教学模型理念,将基本原理与实际操作体验互动结合,通过6大系统、3个层次,引导学生按层级深化学习。虚拟仿真实验手段的引入,实现了教学方法和教学评价体系的创新。从课堂教学和实验报告的反馈结果看,虚拟仿真实验融入无障碍设计教学能提升学生专业素质、激发学生创新意识、增强学生综合能力和培养社会责任感,是促进无障碍设计建筑教育升级的有效路径。

多失效模式与变量相关的管道失效概率预测

针对腐蚀管道多失效模式相互竞争、变量非独立的特点以及小失效概率预测效率低的问题,提出一种基于子集模拟法(SS)的腐蚀管道时变失效概率预测方法。基于泄漏与爆裂失效的极限状态函数,考虑泄漏与爆裂失效的竞争关系,构建管道竞争失效概率预测模型;使用Nataf转换方法描述模拟样本中缺陷深度与长度的相关性,提出考虑失效模式竞争性、变量相关性的腐蚀管道失效概率求解方法,并采用蒙特卡罗模拟(MCS)验证该方法;应用上述方法,探究缺陷深度和长度的弱相关性(相关系数0~0.3)对管道服役15年内失效概率的影响。结果表明:失效概率大于10-6时,使用该方法的计算结果与MCS计算结果基本相同,计算效率高于MCS,且可预测概率水平为10-12的极小概率事件;管道服役15年内,缺陷变量相关系数越大,管道爆裂失效概率越大,越早到达爆裂失效概率阈值年限;而随着相关系数的增大,泄漏失效概率越小,越晚达到泄漏失效概率阈值年限;在预测后期,相关系数增大对2种失效概率的影响均减弱。

基于生态网络优化对比的国土空间生态修复策略研究

生态网络构建有助于整合破碎绿地斑块,识别国土空间生态修复过程中的关键区域并制定针对性措施,为生态型国土空间整治提供方法与技术支撑。然而,目前基于自然资源与土地利用现状构建的单一时空情景生态网络,忽略了网络与城市发展的动态变化,其稳定性与连通性缺乏验证反馈,契合城市发展的合理网络优化方案尚不明晰,生态保护措施难以适应未来城市空间的发展变化。在构建现有生态网络的基础上,对未来城市土地利用扩张情况进行预测,从生态源地、廊道、节点的动态修复视角设置增加生态踏脚石、清除生态障碍点和保护关键生态夹点3种网络优化情景,通过网络连通性分析对3种修复情景进行优化效应评估。结果显示,3种修复情景中,消除生态障碍点对生态网络的优化作用最明显,是未来生态网络构建与优化的主要关注方向。以通城县为例,判定了生态网络的最佳优化方案,提出适应现状地域特征、面向未来发展方向的生态安全格局,从生态资源要素与城市发展动态演替的视角为生态格局优化提供新思路,为生态型国土空间综合整治提供科学技术方法。

河控浅水三角洲前缘树枝状沙坝沉积构型与形成机理

河控浅水三角洲前缘砂体可分为分流沙坝型和指状沙坝型2类河-坝组合类型,前人多关注扇状的分流沙坝型与鸟足状的指状沙坝型的前缘砂体,而对多个指状沙坝组成的树枝状沙坝关注不足,其沉积构型与形成机理尚不清楚。以鄱阳湖日帽洲三角洲为例,综合卫星地图、探地雷达、浅钻孔、沉积数值模拟数据,揭示了河控浅水三角洲前缘树枝状沙坝的沉积构型与形成机理。研究认为,树枝状沙坝是由多个相互分叉、交汇的指状沙坝拼接而成,呈现“河在坝上走”的河-坝组合关系,其间发育分流间湾。根据规模差异,树枝状沙坝内的分流河道可分为主支分流河道与侧支分流河道,主支分流河道的宽度大、数量少,多发育于近源端并延伸至沙坝末端,分布于沙坝中部;侧支分流河道的宽度小、数量多,多分布于前缘两侧与末端。树枝状沙坝的形成与细粒、黏性、高排量河流供给相关,细粒与黏性沉积物促进了稳定天然堤的加积与指状沙坝的形成,高排量导致了分流河道的分流与决口,从而形成树枝状的指状沙坝。河控浅水三角洲前缘树枝状沙坝储集层的侧向连通性较差,优势储集层位于指状沙坝中部,为分流河道砂体与近岸河口坝砂体。

江西天井式民居生态适宜性探究

江西地区传统天井式民居具有良好的生态适宜性,在漫长的岁月中形成一套人与自然相和谐的共处模式。文章选取典型案例进行实地测绘、建模,借助Ecotect、Phoenics以及Energy Plus软件进行模拟分析,比较天井式民居与现代民居的光环境、风环境及能耗,验证天井式民居宜居性特征,分析天井式民居生态适宜性的优势与短板,并提出提高现代乡土民居生态适宜性的设计策略,以期为现代建筑的被动式节能技术提供优化思路。

虚拟仿真技术在土木工程中的应用

土木工程中使用虚拟现实仿真技术可以对建筑的施工展开仿真测试,及时发现施工过程中没有发生或存在的问题。将虚拟计算机仿真技术运用到施工中,计算机生成的施工环境是虚拟的,人们对施工环境、施工流程等的感知都是现实的,施工人员就能够利用各种技术进行人与虚拟环境之间的互动,对虚拟环境实时应答。因此,根据虚拟仿真技术在土木工程中的应用予以分析。

数字孪生技术驱动下高职土木建筑类专业虚拟仿真实训基地建设研究

虚拟仿真实训教学工作的开展,可有效解决高职土木建筑类专业部分实训因体量大、成本高、不易复制等导致学生难以实现全程体验的问题。基于数字孪生技术的高职土木建筑类专业虚拟仿真实训基地建设,可充分弥补实践教学设施方面的缺陷,提升实物模型无法达成的教学价值,对高职土木建筑类专业高素质技术技能人才的输出价值巨大。

基于神威加速计算架构的LBM多级并行计算

格子玻尔兹曼方法(lattice Boltzmann method,LBM)是一种基于分子运动理论计算流体力学(computational fluid dynamics,CFD)的方法,提高LBM的并行计算能力是高性能计算领域的一项重要的研究内容.本文基于SW26010Pro处理器,通过区域分解、数据重构、双缓冲、向量化等优化方法,实现了LBM的多级并行.基于以上优化方案,测试了5600万网格规模,实现结果显示,相比于MPI进行级并行,碰撞过程的平均加速倍数达到61.737、迁移过程的平均加速倍数达到17.3,同时对方腔流案例做了强扩展测试,网格规模为1200×1200×1200,以6.2万计算核心为基准,百万核心的并行效率超过60.5%.

典型海相砂质临滨坝沉积演化过程及成因机制

滩坝砂体是重要的油气储层,其形成的水动力机制复杂多变,受露头及现代沉积等资料的局限性影响,坝体的发育过程、几何形态、动态演化模式及构型叠置关系尚不明确。针对以上问题,利用沉积数值模拟与现代沉积相结合的方法,对典型正向线性临滨坝的沉积演化过程及成因机制进行了探讨。研究结果表明:典型海相临滨坝完整的发育阶段包括锥形坝形成期、弯月坝发育期、条带状复合坝形成期、条带状复合坝扩大生长期以及条带状复合坝停止发育期,现代沉积中可见不同发育阶段的坝体。不同演化阶段的坝体受向岸流、环流、沿岸流和底流等水动力控制。锥形坝及弯月坝为多个小规模、近等间距规则排列的坝体,受向岸流及沿岸环流不断冲刷,锥形坝演化为弯月坝。锥形坝及弯月坝间发育裂流凹槽,坝顶可发育回流沟槽,为典型的顶积式沉积过程。弯月坝坝体及坝间凹槽不断被沉积充填,形成相对整一的条带状复合坝,此阶段表现为典型的侧积式沉积过程。复合坝在向岸流及底流改造下变宽、变厚,最终出露水面形成障壁型滨岸。复合坝内部构型可由多个锥形坝、弯月坝及坝间凹槽构成,呈锥形坝-裂流凹槽-锥形坝或弯月坝-裂流凹槽-弯月坝的构型叠置关系,剖面上呈厚—薄—厚的叠置特征。

复杂工业产品多学科设计仿真优化平台(UniXDE)研究与应用

针对国内外已有的复杂工业产品多学科设计仿真优化框架与平台在多学科模型集成能力、计算能力、协同能力方面的不足,研究和开发国产自主的新一代复杂工业产品多学科设计仿真优化框架与平台UniXDE(unified exploration and design environment)。本平台基于微服务云架构技术构建整体框架,提供低代码仿真优化流程编排、组件化CAD/CAE参数化集成接口、丰富的多学科设计优化算法库、分布式高性能优化计算引擎、可视化计算监控和报告自动生成等功能。通过白车身轻量化、船型优化、飞行器起落架性能优化等工程应用,表明UniXDE可显著提升产品综合性能和设计成功率。

武器装备作战效能仿真系统WESS

作战效能仿真是进行装备论证与总体设计的重要技术手段。针对传统作战效能仿真系统在模型可重用、仿真可组合、系统可演化等方面存在的不足,结合自身实际并参照国外经验提出了基于模型框架的效能仿真系统开发思路,并据此开发了一款通用型可扩展的武器装备作战效能仿真系统WESS。介绍了WESS的功能特点、软件结构、使用流程和关键技术,并通过一个典型案例介绍了WESS的功能。实际应用表明WESS系统能够较好地满足效能仿真的可重用、可组合、可演化需求。