Seabed scene simulation and its realization in extending Vega

Realistic simulation of underwater scene is always difficult because of the special and complex vision effects in underwater space. Seabed is an important part of underwater environment. This paper describes the methods for seabed scene simulation based on OpenGL. It includes construction of fluctuant terrain based on the random sinusoidal algorithm, simulation of seabed flicker effect by means of circular texture mapping and generation of turbidity effect by using fog techniques. For the application based on the leading high level 3D development environment - Vega, underwater scene simulation is still a difficulty since there is no module for it. Rased on the analysis of Vega software and the research on seabed scene simulation methods, a Vega extending module named 'Underwater Space' was created through developing module class and extending lynx interface. The module class was designed through developing DLL written in C + + . The Lynx was extended through developing keyword configure file, GUI configure file and lynx plug-in DLL. The problem that Vega can't simulate underwater space, is elementarily resolved. The results show that this module is efficient, easy using, and the seabed scene images are vivid.

Sparsity-based efficient simulation of cluster targets electromagnetic scattering

An efficient and real-time simulation method is proposed for the dynamic electromagnetic characteristics of cluster targets to meet the requirements of engineering practical applications.First,the coordinate transformation method is used to establish a geometric model of the observation scene,which is described by the azimuth angles and elevation angles of the radar in the target reference frame and the attitude angles of the target in the radar reference frame.Then,an approach for dynamic electromagnetic scattering simulation is proposed.Finally,a fast-computing method based on sparsity in the time domain,space domain,and frequency domain is proposed.The method analyzes the sparsity-based dynamic scattering characteristic of the typical cluster targets.The error between the sparsity-based method and the benchmark is small,proving the effectiveness of the proposed method.

Modeling of Irregular Structures in Scene Simulation Based on Creator and 3dsmax

Creating proper 3D models plays an important pole in the development of scene simulation system based on multigen creator and Vega software. However, it is very difficult to construct complex structures by multigen creator. In this paper, an approach is proposed which is utilizing 3dsmax as assistant modeling software. 3D models developed in 3dsmax could be saved in 3ds format and then imported into multigen creator software. The models are revised and then saved in fit format by creator. For reducing model＇s data, simplification strategy is proposed. The problem of constructing complex models in creator is solved smoothly. In the development of digital rocket simulation project, the models constructed by this method have good visual effect, small size, and could be driven by Vega correctly.

An Online English Course Teaching Model Based on Scene Simulation

In order to improve the English online courses teaching scene adaptability, optimize the online English teaching mode, improve the quality of English teaching, an English online course teaching platform is proposed based on scene simulation. B/S client communication protocol is constructed in network transport layer, and the scene simulation model of English Online Course Teaching is established, online English teaching platform designed in this paper is constructed based on the sensing layer, network layer and application layer. A data processing center is constructed in the B/S structure and the network environment, Open Core kernel is used to realize the optimization of teaching model of English online courses, improve the teaching platform of online courses, and improve the scene adaptation ability. The test results show that the platform for online English teaching has better independent learning ability, the effectiveness of online English course teaching is better, test objects have higher satisfaction with English Online Course Teaching.

Digital Simulation Platform for Satellite Launch Mission Verification

To simulate the satellite launch mission under a general platform which could be used in a full-digital mode as well as in a semi-physical way, is an important way to certify the mission design performance as well as technical feasibilities, and it relates to complex system simulation methods such as multi-disciplinary coupling, multi-language modeling as well as interactive simulation and virtual simulation technologies. This paper introduces the design of a digital simulation platform for satellite launch mission verification.The platform has the advantages of high generality and extensibility, being easy to build up. The Functional Mockup Interface(FMI) Standard is adopted to achieve integration of multi-source models. A WebGL based 3D visual simulation tool is also adopted to implement the virtual display system which could display the rocket launch process and rocket-satellite separation with high fidelity 3D virtual scenes. A configuration tool was developed to map the 3D objects in the visual scene with simulation physical variables for complex rocket flight control mechanisms, which greatly improves the platform's generality and extensibility. Finally the real-time performance had been tested and the YL-1 launch mission was adopted to demonstrate the functions of the platform.The platform will be used to construct a digital twin system for satellite launch missions in the future.

Infrared image simulation of ground maneuver target and scene

Infrared scene simulation has extensive applications in military and civil fields. Based on a certain experimental environment,object-oriented graphics rendering engine（ OGRE） is utilized to simulate a real three-dimensional infrared complex scene. First,the target radiation of each part is calculated based on our experimental data. Then through the analysis of the radiation characteristics of targets and related material,an infrared texture library is established and the 3ds Max software is applied to establish an infrared radiation model.Finally,a real complex infrared scene is created by using the OGRE engine image rendering technology and graphic processing unit（ GPU） programmable pipeline technology. The results show that the simulation images are very similar to real images and are good supplements to real data.

Comparison of the Feasible Schemes for HT-7U Assembly Simulation

The whole superconducting HT-7U Tokamak is a high-cost and large-scale complicated device. The assembly requirement of HT-7U device is arduous and strict. At present, there have been no guiding principle for the assembly of the device, but assembly simulation can help the engineer plan and make decision by an intuitional and visual way before its actual assembly. The problem is that which scheme is most suitable should be solved primarily. From current research situation and technology progress of assembly simulation, this paper explained and analyzed four kinds of technological schemes of assembly simulation in common use. Finally, we got the most feasible scheme that was suitable for HT-7U assembly simulation by comparing their technological issues and difficult points of simulation among the four kinds of feasible schemes.

Development of driver-vehicle-road closed-loop semi-physical simulation system

As hybrid vehicles introduced the motor, the vehicle structure has a significant change in the power matching. A driver-vehicle-road closed-loop semi-physical simulation system, which makes real driving parts together with the simulation car, will bring convenience to the new car design. We used the computer software to simulate the road with a slope, curve and some other features based on the actual road condition, and analyzed the whole road scene in addition to geometry and physical characteristics. Analyzing and constructing the vehicle dynamics basic template, appropriate changes to the template can obtain the desired vehicle dynamics model with an external device to control the model vehicle. It combined the physical operation system with visual display, which gave us real driving feelings and increased the vehicle design predictive accuracy.

多分隔受限场景空间火灾疏散安全性分析

为了优化密室逃脱类场所的复杂空间布局,基于该场所剧情场景下空间多重分隔、空间狭小、封闭且组合多样等结构特点,分析归纳该场所3种典型的受限场景空间类型,以西安市某密室逃脱类场所建筑布局为例,运用Pathfinder和PyroSim软件对其展开火灾情景下的疏散模拟仿真,进而对比分析不同场景空间的火灾特性指标以及疏散安全性。研究结果表明:密室逃脱类场所3种场景空间中,串联式场景空间人员疏散时间最长(141.53 s),单元式次之(115.53 s),并联式最短(112.28 s);从火灾烟气模拟结果看,串联式场景空间安全出口的温度、CO体积分数以及能见度始终都处于安全临界范围内,而其他2种场景空间均超过临界值,并且能见度降至0.06 m,因此从安全性判定,该密室逃脱类场所只有串联式场景空间人员疏散过程是安全的,并联式和单元式场景空间人员疏散过程中均存在一定危险性。对于密室逃脱类场所这种特定狭小空间,烟气的危害对人员安全疏散的影响尤为显著,因此要在防排烟和火灾荷载方面进行重点防控。研究结果可为密室逃脱类场所的空间结构优化提供消防指导。

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。

情景模拟教学法及形成性评价在病理通识教育中的应用研究

文章将情景模拟教学法与形成性评价相结合,围绕教学大纲内容精心设计病理学通识课程情景模拟教案,优化课程形成性评价体系,对授课师资进行培训使授课教师熟知整个情景模拟过程以便于正确地引导和评价,让学生根据情景模拟要求进行角色分工、撰写剧本、课前排练、课堂上进入模拟现场,从而进入学习状态。授课教师根据教案设置,仔细观察每位学生的表现,并应用形成性评价体系对学生的表现进行现场评估,开展师生随堂评教、督导评教及同行评议等多维度教学评价。病理通识教育以学生为主体,实现情景模拟教学法与形成性评价的优势互补,以提高通识教育的教学效果,培养具有国际视野、满足国家与社会需求、符合“四新”要求的高素质拔尖创新人才,为医学通识教育改革提供新的思路和手段。

重大节假日出行方式选择模型研究

为优化节假日高速公路免费政策,选取出行者变量、出行方式相关变量和行程特性变量作为效用变量,构建了出行方式位于上层、出行距离位于下层的NL模型。利用弧弹性法分析不同收费标准和收费里程条件下出行者的行为特性,并利用场景仿真评价多种收费组合对出行方式的影响。研究结果表明:提高收费标准,汽车出行比例会显著降低,且高速铁路承担了大部分的转移交通量。随着收费里程的增加,出行者逐渐倾向于出行成本较小的普通铁路。对长距离出行收费可以提升公共交通分担率,缓解节假日高速公路的交通拥堵。

以问题为基础的学习联合场景模拟教学法对骨科护生参与度及综合能力的影响

目的探讨以问题为基础的学习(PBL)联合场景模拟教学法在骨科护生教学中的应用效果。方法选取2021年6月至2023年2月在我院骨科实习的88例护生为研究对象,将其随机分为传统教学组和联合教学组,各44例。传统教学组采用常规教学法,联合教学组采用PBL联合场景模拟教学法。比较两组的参与度、理论及实操成绩、批判性思维能力、教学评价及教师评价。结果联合教学组的教学、临床护理工作、沟通协作、科研、职业价值观、专业发展能力评分高于传统教学组(P<0.05)。第1、3、6个月,联合教学组的理论及实操成绩均高于传统教学组(P<0.05)。教学后,两组的批判性思维能力倾向量表(CTDI-CV)评分高于教学前,且联合教学组高于传统教学组(P<0.05)。联合教学组的教学好评率高于传统教学组(P<0.05)。联合教学组的教学质量、学生积极性、成绩反馈评分及总分高于传统教学组(P<0.05)。结论PBL联合场景模拟教学法能提升骨科护生的综合成绩,增强参与度,有助于提升护生的教学评价及带教老师的教师评价。

一种基于Unity3D技术的电缆接头故障测寻仿真系统

基于Unity3D技术设计了一个电缆接头故障测寻仿真系统。该系统可模拟电缆接头的失效情况,帮助用户快速定位故障点,并提供可视化的故障信息展示。本文首先介绍了电缆接头故障的常见类型和原因;然后详细阐述系统的设计思路和实现方法,描述了技术架构;最后,对该系统的推广场景及优化思路做了说明。

基于三维场景的铁路车站列车运行联锁控制仿真研究

联锁控制对铁路车站的调度指挥和列车的有序安全运行起着非常关键的作用。为保证铁路车站联锁控制及列车运行演练的真实性和安全性,提出铁路车站联锁控制及列车运行三维虚拟仿真的总体框架。从铁路车站联锁功能入手,设计车站联锁控制的数据结构、功能逻辑和联锁控制仿真算法,实现了铁路车站联锁的逻辑控制及人机交互仿真。采用面向对象的层次分级法,设计铁路车站设备三维模型的层次结构。通过创建预制体并修改其组件的方式,构建铁路车站列车运行三维虚拟场景模型。结合铁路线路逻辑模型,提出了面向联锁控制的列车运行虚拟寻路算法和列车运动驱动算法,利用该算法进行列车各车辆空间位置和姿态的连续计算,实现了在三维场景下铁路列车的启动,加减速运动,定点停车、换道等功能。在此基础上,在Unity引擎环境下开发了基于三维场景的铁路车站列车运行联锁控制虚拟仿真系统,该系统支持铁路车站联锁控制人机交互仿真,并可在铁路车站三维场景中的不同视角下,以可视化方式观察信号设备状态变化以及列车的动态运行情况。通过给定的站内列车调度计划表,利用所开发的系统进行了铁路车站联锁控制及列车运行三维仿真。仿真实例表明,所采用的方法及技术方案在车站联锁的仿真演练与培训学习方面具有良好的应用前景和实际意义。

虚拟荔枝果园建模与采摘行为仿真研究

随着5G技术的发展和应用,基于数字孪生技术的虚拟果园成为智慧果园管理的新模式。为此,基于物联网数据信息采集,提出了一种虚拟荔枝果园模型构建及采摘行为仿真平台构建方法。首先,分析了荔枝果园的组成要素,并使用3dmax、SolidWorks等工具进行了单元模型构建,运用面向对象技术搭建了荔枝果园虚拟场景平台。基于虚拟仿真软件Unity3D,综合三维建模软件与脚本代码,搭建了采摘机器人采摘试验平台,实现了采摘机器人路径规划仿真,并研发了虚拟荔枝果园三维全景虚拟漫游系统。通过虚拟实验平台设置不同的采摘场景,仿真分析获取优化的采摘决策,可预测采摘机器人的真实作业性能,降低采收作业成本。

情景模拟教学法在护士急救能力培训中应用效果的Meta分析

目的 评价情景模拟教学法在护士急救能力培训中的应用效果。方法 检索万方、维普、CNKI、PubMed、Cochrane Library、EMBASE、Web of Science等数据库中有关情景模拟应用于护士急救培训的随机对照实验研究,筛选资料与评价文献质量后,采用Revman 5.4软件进行Meta分析。结果 共纳入4篇文献,Meta分析结果显示,情景模拟教学法可有效提高护士的急救理论和操作考核成绩、评判性思维能力、应急能力及急救能力。结论 在护士急救能力培训中采用情景模拟教学法,能丰富培训内容和方法,提高护士的临床技能,提升护理团队的综合素质。

基于FMI的卫星数字仿真平台设计及实现

针对卫星仿真技术的标准化和通用化发展需求,基于FMI(functional mock-up interface)的接口标准和模型复用技术,构建一个能够支持卫星数字仿真的工具体系架构,在此基础上,运用模块化思想设计了卫星数字仿真平台,并给出Simulink及C/C++模型的FMI标准封装方法.利用卫星数字仿真平台,搭建了多星运行仿真场景,通过远程过程调用技术,将仿真过程数据推送到可视化平台中,完成对卫星运行场景的可视化展示.仿真案例说明,卫星仿真平台可以对模型运行状态及变化趋势进行监控,同时,场景可视化平台可以对卫星的运行轨道及姿态等数据实时动态显示.

面向模拟环境的自动驾驶道路场景生成方法研究

针对生成自动驾驶系统道路场景的问题,提出面向模拟环境的道路场景生成方法。该方法定义并实现了八类道路组件,使用基于指导的道路组件拼接方法将道路组件拼接为道路场景,根据道路场景的拓扑结构计算道路场景之间的相似度完成去重。去重后的道路场景在自动驾驶系统与模拟器中开展联合仿真。实验表明,相较于基于随机拼接的道路场景生成方法,该方法能够生成可以直接应用于自动驾驶系统测试的多样化的道路场景,弥补了几何与拓扑结构多样性不足的局限性问题。

基于SIMULINK和VR技术的三维监视软件开发

在某武器系统演示试验中,需要对靶目标的运动进行实时跟踪,并方便直观地查看其飞行姿态和飞行轨迹。根据任务需求,给出了一种基于Matlab(Simulink)和VR技术的三维动态监视软件的实现方法。软件采用VB与Matlab混合编程,使用Simulink模型接收VB传送的数据并即时更新虚拟世界场景,充分利用虚拟现实技术的真实直观、视点可变、与现实同步等优点,很好地完成了动态监视任务。重点介绍了程序接口技术和Simulink模型控制技术,这种方法也能够方便地应用于其他类似的监视任务中。