Real-time hybrid simulation of structures equipped with viscoelastic-plastic dampers using a user-programmable computational platform

A user-programmable computational/control platform was developed at the University of Toronto that offers real-time hybrid simulation （RTHS） capabilities. The platform was verified previously using several linear physical substructures. The study presented in this paper is focused on further validating the RTHS platform using a nonlinear viscoelastic-plastic damper that has displacement, frequency and temperature-dependent properties. The validation study includes damper component characterization tests, as well as RTHS of a series of single-degree-of-freedom （SDOF） systems equipped with viscoelastic-plastic dampers that represent different structural designs. From the component characterization tests, it was found that for a wide range of excitation frequencies and friction slip loads, the tracking errors are comparable to the errors in RTHS of linear spring systems. The hybrid SDOF results are compared to an independently validated thermal- mechanical viscoelastic model to further validate the ability for the platform to test nonlinear systems. After the validation, as an application study, nonlinear SDOF hybrid tests were used to develop performance spectra to predict the response of structures equipped with damping systems that are more challenging to model analytically. The use of the experimental performance spectra is illustrated by comparing the predicted response to the hybrid test response of 2DOF systems equipped with viscoelastic-plastic dampers.

A Portable Multi-functional Real-time Digital Simulator Dedicated to Protective Relay Testing

The paper intfoduces a PC-DSP based real-time digital simulator which is portable in size and aimed at the closed-loop testing of various types of protective relays for their design and application. The simulator can be widely used in not only concerning utilities but also manufacturers and research / certification institutes because of its many functions. The hardware architecture and software implementation of the simulator are described. The main features and functions of the simulator are also

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.

Some Techniques for Solving Ordinary Differential Equations with Discontinuities in Real－time Simulation

This paper discusses some techniques for treating discontinuities of the right-hand functions of ordinary differential equations (ODEs) in real-time digital simulation (RTDS). The numericalexperiments show that these techniques are effective.

Digital/Analog Simulation Platform for Distributed Power Flow Controller Based on ADPSS and dSPACE

Distributed power flow controller,which is among the most powerful distributed flexible transmission equipments,is still only in the stage of the oretical research and digital simulation.In order to promote the engineering demonstration of a distributed power flow controller,it is urgent to establish a digital/analog simulation platform that supports closed-loop real-time simulation of a distributed power flow controller.In this paper,the electromagnetic transient model of a distributed power flow controller is established on ADPSS(advanced digital power system simulator).The rapid control prototype realized by dSPACE is connected to ADPSS to form a digital/analog simulation platform for a distributed power flow controller.Through a voltage control and power flow control simulation of the test system with a distributed power flow controller,the correctness and effectiveness of the constructed simulation platform are verified,which provides a new way for the verification of the new theory of a distributed power flow controller.

Real-time simulation platform for photovoltaic system with a boost converter using MPPT algorithm in a DSP controller

Recently, real-time simulation of renewable energy sources are indispensible for evaluating the performance of the maximum power point tracking （MPPT） controller, especially in the photovoltaic （PV） system in order to reduce cost in the testing phase. Nowadays, real time PV simulators are obtained by using analog and/or digital components. In this paper, a real-time simulation of a PV system with a boost converter was proposed using only the digital signal processor （DSP） processor with two DC voltage sources to emulate the temperature and irradiation in the PV system. A MATLAB/ Simulink environment was used to develop the real-time PV system with a boost converter into a C-program and build it into a DSP controller TMS320F28335. Besides, the performance of the real-time DSP-based PV was tested in different temperature and irradiation conditions to observe the P-V and V-I characteristics. Further, the performance of the PV with a boost converter was tested at different temperatures and irradiations using MPPT algorithms. This scheme was tested through simulation and the results were validated with that of standard conditions given in the PV data sheets. Implementation of this project helped to attract more researchers to study renewable energy applications without real sources. This might facilitate the study of PV systems in a real-time scenario and the evaluation of what should be expected for PV modules available in the market.

基于VR-Platform数字矿山仿真系统的建立与应用

基于数字矿山三维建模与虚拟现实研究理论,选用VR-Platform虚拟软件平台结合三维虚拟仿真技术,建立数字矿山仿真系统。经过收集资料,将矿山数字高程模型(DEM)导入3ds Max中进行三维仿真建模、纹理贴图、烘焙处理及灯光设置等,然后将烘焙好的模型导入VR-Platform虚拟现实软件平台进行后期加工与处理,最终实现数字矿山的多层次、多功能、多阶段综合性仿真系统服务平台。该平台对矿山的发展建设、决策部署、信息管理、科学研究等具有十分重要的意义。

Research on Digital Twin System Platform Framework and Key Technologies of Unmanned Ground Equipment

As an emerging technology,digital twin is expected to bring novel application modes to the whole life cycle process of unmanned ground equipment,including research and development,design,control optimization,operation and maintenance,etc.The highly dynamic,complex,and uncertain characteristics of unmanned ground equipment and the battlefield environment also pose new challenges for digital twin technology.Starting from the new challenges faced by the digital twin of unmanned ground equipment,this paper designs a service-oriented cloud-edge-end collaborative platform architecture of the digital twin system of unmanned ground equipment,and further analyzes several key technologies supporting the implementation of the platform architecture.

Augmented virtual environment: fusion of real-time video and 3D models in the digital earth system

An Augmented virtual environment(AVE)is concerned with the fusion of real-time video with 3D models or scenes so as to augment the virtual environment.In this paper,a new approach to establish an AVE with a wide field of view is proposed,including real-time video projection,multiple video texture fusion and 3D visualization of moving objects.A new diagonally weighted algorithm is proposed to smooth the apparent gaps within the overlapping area between the two adjacent videos.A visualization method for the location and trajectory of a moving virtual object is proposed to display the moving object and its trajectory in the 3D virtual environment.The experimental results showed that the proposed set of algorithms are able to fuse multiple real-time videos with 3D models efficiently,and the experiment runs a 3D scene containing two million triangles and six real-time videos at around 55 frames per second on a laptop with 1GB of graphics card memory.In addition,a realistic AVE with a wide field of view was created based on the Digital Earth Science Platform by fusing three videos with a complex indoor virtual scene,visualizing a moving object and drawing its trajectory in the real time.

数字专网的通信终端与加密组件测试系统设计

为提高数字专网的通信终端与配套加密组件测试效率,降低实装测试环境的构建、运维及人力成本,开展了基于半实物仿真的测试系统设计;对通信终端与加密组件的测试需求进行了分析,提出并实现了一种模拟数字专网的通信建链流程和加密通信业务流程的方法;采用了通用AXIe(仪器与测试高级电信计算架构的扩展)测试平台与扩展测试仪器的架构进行系统设计,实现与不同测试对象的物理接口适配、信号调理以及报文数据交互控制,为通信终端及加密组件的加密业务成功率测试、语音质量评测以及远供工作电流测量提供自动化测试技术手段;经验证,测试系统通信链路时延<100 ns,可为通信终端提供良好的语音质量评测环境,PESQ(感知语音质量评测模型)测试≥4.20,可支持加密业务成功率指标≥99.9%的无人值守测试。

校企合作共建共享数字化虚拟仿真在线理赔实训平台案例分析

数字化时代推动了各行业的线上业务发展,为了给客户提供更方便的服务,保险理赔行业也开展了线上服务,并且产品形态也更具创新性。本文以保险职业学院立项省级楚怡产教融合金融保险实训基地为典型案例,阐述了线上保险理赔实训平台的设计和创新,介绍了场景创新和实践,通过线上理赔实训平台提升既有理赔从业人员在线理赔实务水平,使其紧跟行业发展趋势,并助力行业企业优化业务平台,提升理赔效率、质量。

基于虚拟仿真技术的机器人工程专业课程数字化教学平台设计

教学平台是机器人工程专业课程数字化教学中必不可少的教学工具,但传统平台存在仿真度较低的问题,而且学生的学习效果较差。因此,设计基于虚拟仿真技术的机器人工程专业课程数字化教学平台。在硬件方面,对HTC Vive装置进行选型与设计,利用HTC Vive装置实现仿真教学交互;在软件方面,利用虚拟仿真技术搭建机器人虚拟模型,设计虚拟现实(Virtual Reality,VR)全视角观察体验场景、VR碰撞体验场景与VR虚拟视角自由移动体验场景,在虚拟场景中实现学生与虚拟机器人交互操作,以此完成平台设计。实验结果表明,应用设计平台开展教学后,学生的综合成绩大幅提升。

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.

建筑表皮综合环境数字孪生模型构建及模拟平台

建筑表皮是多物理环境交互的接口,当前的建筑性能模拟软件多为针对单一环境的模拟,多环境联合模拟的工具平台较少。基于建筑运动几何学,遴选动态表皮的可控运动形式,提取24类动态表皮设计原型,建立面向控制的建筑表皮综合环境数字孪生模型,并结合案例对数字孪生模型及模拟平台进行应用验证。使用Python语言将模型封装成动态表皮综合环境模拟平台,针对不同表皮设计形式和环境场景模拟,可以快速直观地分析动态表皮的环境响应关系和性能。模拟平台融合了热环境、光环境、声环境和空气品质这四个综合环境,解决了建筑性能模拟软件无法多环境联合模拟的问题,从而满足对建筑表皮的仿真、预测、优化和控制等实际应用需求。

数字化核能谱获取的仿真实验平台设计

基于MATLAB GUI图形用户界面设计了包含多种滤波成形方法的数字化核能谱获取仿真实验平台。该平台集成了核脉冲信号的基本预处理模块,同时采用尖峰脉冲成形、梯形脉冲成形和类高斯脉冲成形等常见的滤波成形模块以及幅度甄别模块。通过该平台导入实测核脉冲信号,能研究不同滤波成形方法在滤波成形、堆积分离、能谱能量分辨率和计数方面的特点,同时还可自定义成形参数研究参数的影响。该实验平台操作简单,能够将能谱获取过程中滤波成形算法和成形参数的作用以及影响规律直观地展示出来。

基于Style3D技术的甪直水乡妇女服饰虚拟仿真研究

甪直水乡妇女服饰是具有典型特色的中国传统地方服饰,随着现代社会的发展,目前的影响力正逐渐式微。文章通过爬梳文献和实地考察甪直水乡妇女服饰博物馆,对各部件服装的服制特色进行梳理与分析。在此基础上,运用服装CAD软件绘制样板,运用Style 3D软件实现服装的虚拟仿真,包括细节配饰和纹样色彩的还原,为虚拟仿真中遇到的问题提出可行的解决方案。结果表明,文章所提出的数字化虚拟技术是一种有效的传统服饰传承方式,为发展和保护中国传统地方服饰文化拓宽了途径和思路。

面向数字孪生的柔性离散事件系统建模与仿真平台设计

针对当前仿真平台难以在具有较高柔性的系统中建立数字孪生模型的问题,提出了面向数字孪生的柔性离散事件系统建模与仿真平台设计方法。该方法首先进行需求层次分析,建立平台设计逻辑模型指导设计,并基于该逻辑模型提出了平台在仿真引擎、柔性孪生模型建模、可视化3个方面的详细设计方法,建立平台总体架构。为实现平台与数字孪生相结合,提出了基于物理实体状态的事件推进机制和面向优化算法的仿真步进迭代机制的数据交互机制。最后,基于该设计方法开发了原型平台NextING,并与商业仿真软件Plant Simulation进行对比测试,通过一个装配流水线实例以及一个移动机器人存取系统实例验证了该方法的有效性。

《微观经济学》模拟实验教学数字化改革的实施路径

随着微观经济学传统教学方法弊端的不断显现,模拟实验教学法应运而生,但受实施成本、学生接受度以及现行教学管理制度等多重因素的联合制约,当前我国《微观经济学》模拟实验教学的开展并不顺畅,如何借助大数据、云计算、VR、AR、5G等现代数字技术手段深化《微观经济学》课程模拟实验教学改革正迫在眉睫。为此,从数字化视角出发,对《微观经济学》课程的模拟实验教学改革问题进行了系统探讨。首先,教学改革研究团队结合成员过往教学经历,对其模拟实验教学面临的困境进行归纳总结。然后,从整体性视角出发,对其模拟实验教学数字化改革的潜在功效进行系统提炼。最后,结合数字技术发展实际,对其模拟实验教学数字化改革的实现路径进行科学规划。研究结果显示:《微观经济学》模拟实验教学数字化改革将赋能实验场景营造,降低场景营造成本。提高实验情景的逼真度,改善模拟实验教学体验。增进模拟实验教学的标准化程度和可监督水平,减少课程模拟实验教学的推进阻力,促进其模拟实验教学的高质量发展。与此相对,基于虚拟仿真技术的模拟实验网络教学平台作为一种先进的教学工具与教学模式,是数字技术与《微观经济学》课程模拟实验教学过程深度融合的新产物。为了搭建完善的模拟实验网络教学平台,开课单位应遵循“开发准备-平台开发-平台使用-平台维护”的开发思路进行有序建设。

广州市交通治理数字化转型实践

信息技术发展推动了交通行业数字化转型,数字化如何在交通治理方面发挥作用有待深入研究。结合数字化发展情况,提出交通拥堵治理是城市治理的关键板块,数据赋能和动态管理是城市交通治理的重要抓手和必然要求。基于交通时空大数据处理、一体化交通仿真、道路网阈值界定和交通态势分析等关键技术探讨交通治理如何进行数字化转型。以广州市为例,总结在交通运行评价、交通管理政策、信号控制优化、交通组织和占道施工管理等方面的数字化治理经验和主要成效。结果表明,数字化在交通治理中起到了监测、体检、评估、反馈、修订等作用,使得治理手段更加丰富、应对措施更加精准有效。

基于UE4技术平台的赣南苏区红色文化遗址建筑群三维虚拟仿真关键技术研究

随着科技的发展,数字化技术在保护和传承文化遗产方面发挥着越来越重要的作用。红色文化遗址作为我国重要的文化遗产,具有独特的历史价值和文化意义。然而,由于这些遗址往往年代久远,且受到自然和人为因素的侵蚀,保护和传承难度较大。基于UE4技术平台的三维虚拟仿真技术为红色文化遗址的保护和传承提供新的解决方案。该文旨在探讨基于UE4技术平台的赣南苏区红色文化遗址建筑群三维虚拟仿真关键技术研究,以期为数字化保护和传承红色文化遗产提供理论和实践支持。