Construction and Practice of First-Class Courses on Virtual Simulation Experimental Teaching of Urban Overpasses

Virtual simulation experiment,as a new way to promote the digital transformation of education,has a broad development prospect and application value.The civil engineering experimental volume and space are huge,it has a long construction period,is highly dangerous,and is difficult to experiment with.In order to solve the contradiction between the traditional theory teaching of civil engineering and the engineering training of students,the construction of virtual simulation experimental teaching courses with a high degree of realism,intuition,and accuracy can be used as a useful supplement and innovation of experimental and practical teaching.This paper takes the virtual simulation experimental teaching course of urban overpasses as an example,introduces the necessity and practicability of the course construction,and describes the experimental principle structure of the course,the simulation scene design,the experimental teaching process,the experimental method,etc.The course has achieved good application results,and it has been recognized as the first-class virtual simulation teaching course of the Chongqing Municipal Government,which provides certain references to the construction of the same type of courses in the civil engineering profession.

Experiment Combined with Picture Archiving and Communication System in the Practical Teaching of Medical Imaging

Objective:To explore the application effect of virtual simulation experiment combined with picture archiving and communication system(PACS)in medical imaging practical teaching.Methods:97 students from the medical imaging class of 2022 were divided into two groups;the control group(n=48)was taught by the traditional teaching method,whereas the research group was taught by virtual simulation experiment combined with PACS(n=49).The teaching achievements and teaching effects of the two groups were compared to define the advantages of the two teaching modes.Results:Initially,there were no significant differences in the basic theory,image analysis,report writing,and differential diagnosis scores between the two groups of students(P>0.05);however,after 16 weeks of teaching,the scores of the research group were better than those of the control group(P<0.05);the pass rate of students in the study group(93.88%)was higher than that in the control group(81.25%);the scores of students in the research group in terms of clinical inquiry skills,X-ray/computed tomography/magnetic resonance imaging(X-ray/CT/MRI)operation skills,and doctor-patient communication skills were significantly higher than those in the control group(P<0.05).Conclusion:In medical imaging practical teaching,the application of virtual simulation experiment combined with PACS can effectively address several problems in the traditional teaching mode,including the single teaching method,the single teaching content,and the lack of innovation,and,at the same time,improve students’basic theoretical knowledge,X-ray/CT/MRI operation skills,consultation skills,and doctor-patient communication skills,thereby effectively improving the teaching quality and learning effect.

Reform of Practical Teaching of “Linux Operating System Fundamentals” Under the Background of Emerging Engineering Education

With the advancement of the construction of emerging engineering education,the reform of practical teaching has become an important task of higher engineering education.This article takes the course“Linux Operating System Fundamentals”as an example to explore practical teaching reform in the context of emerging engineering education.By analyzing the current situation and problems in course practical teaching,we proposed practical teaching reforms such as online experiments,practical content updates,project-based engineering practices,and diversified evaluation models,and designed corresponding implementation plans.Practice has proved that this reform can improve students’learning interest and engineering practical skills,and cultivate outstanding engineers with innovative spirit and practical skills.

Virtual simulation experiment of the design and manufacture of a beer bottle-defect detection system

Background Machine learning-based beer bottle-defect detection is a complex technology that runs automatically;however,it consumes considerable memory,is expensive,and poses a certain danger when training novice operators.Moreover,some topics are difficult to learn from experimental lectures,such as digital image processing and computer vision.However,virtual simulation experiments have been widely used to good effect within education.A virtual simulation of the design and manufacture of a beer bottle-defect detection system will not only help the students to increase their image-processing knowledge,but also improve their ability to solve complex engineering problems and design complex systems.Methods The hardware models for the experiment(camera,light source,conveyor belt,power supply,manipulator,and computer)were built using the 3DS MAX modeling and animation software.The Unreal Engine 4(UE4)game engine was utilized to build a virtual design room,design the interactive operations,and simulate the system operation.Results The results showed that the virtual-simulation system received much better experimental feedback,which facilitated the design and manufacture of a beer bottle-defect detection system.The specialized functions of the functional modules in the detection system,including a basic experimental operation menu,power switch,image shooting,image processing,and manipulator grasping,allowed students(or virtual designers)to easily build a detection system by retrieving basic models from the model library,and creating the beer-bottle transportation,image shooting,image processing,defect detection,and defective-product removal.The virtual simulation experiment was completed with image processing as the main body.Conclusions By mainly focusing on bottle mouth defect detection,the detection system dedicates more attention to the user and the task.With more detailed tasks available,the virtual system will eventually yield much better results as a training tool for image processing education.In addition,a novel visual perception-thinking pedagogical framework enables better comprehension than the traditional lecture-tutorial style.

A virtual experiment showing single particle motion on a linearly vibrating screen-deck

A virtual sieving experimental simulation system was built using physical simulation principles.The effects of vibration frequency and amplitude,the inclination angle of the screen-deck and the vibration direction angle of screen on single particle kinematics were predicted.Properties such as the average velocity and the average throw height were studied.The results show that the amplitude and the angle of vibration have a great effect on particle average velocity and average height.The vibration frequency and the screen-deck inclination angle appear to have little influence on these responses.For materials that are difficult to screen the vibration frequency and amplitude,the screen-deck inclination angle and the vibration angle should be set to 14 Hz,6.6 mm,6° and 40°,respectively,to obtain optimal particle kinematics.A screening process can be simulated reliably by means of a virtual experiment and these results provide references for both screening theory research and sieving practice.

Development of an Intelligent Vehicle Experiment System

Existing vehicle experiment systems tend to focus on the research of vehicle dynamics by conducting performance tests on every system or some parts of the vehicle so as to improve the entire performance of the vehicle. Virtual technology is widely utilized in various vehicle test-beds. These test-beds are mainly used to simulate the driving training, conduct the research on drivers＇ behaviors, or give virtual demonstrations of the transportation environment. However, the study on the active safety of the running vehicle in the virtual environment is still insufficient. A virtual scene including roads and vehicles is developed by using the software Creator and Vega, and radars and cameras are also simulated in the scene. Based on dSPACE＇s rapid prototyping simulation and its single board DS1103, a simulation model including vehicle control signals is set up in MATLAB/Simulink, the model is then built into C code, and the system defined file（SDF） is downloaded to the DS1103 board through the experiment debug software ControlDesk and is kept running. Programming is made by mixing Visual C＋＋ 6.0, MATLAB API and Vega API. Control signals are read out by invoking library function MLIB/MTRACE of dSPACE. All the input, output, and system state values are acquired by arithmetic and are dynamically associated with the running status of the virtual vehicle. An intelligent vehicle experiment system is thus developed by virtue of program and integration. The system has not only the demonstration function, such as general driving, cruise control, active avoiding collision, but also the function of virtual experiment. Parameters of the system can be set according to needs, and the virtual test results can be analyzed and studied and used for the comparison with the existing models. The system reflects the running of the intelligent vehicle in the virtual traffic environment, at the same time, the system is a new attempt performed on the intelligent vehicle travel research and provides also a new research method for the development of intelligent vehicles.

Virtual Experimental Project Design in the Digital Signal Processing Course

This paper proposes the design and development of virtual experimental projects in the Digital Signal Processing course,using MATLAB,Proteus,and CCS platforms to develop a library of typical experimental cases for biomedical engineering majors and discusses the design process.Based on these typical cases,this paper explores the secondary design for innovative engineering practice case teaching,which can promote students’understanding and mastery of digital signal processing theories,algorithms,and technologies in an intuitive,flexible,and efficient way;quickly build new innovative engineering case models and further cultivate students’engineering application ability as well as innovative thinking.

基于Unity3D的矿井火灾监测与防治虚拟仿真试验系统

为更好地开展矿业安全类专业试验实践教学和培训,培养安全应急一流复合型拔尖人才,设计一种基于Unity3D的矿井火灾监测与防治虚拟仿真试验教学系统。首先,采用3ds Max建立仿真模型,构建矿井火灾监测防治试验系统总体框架;其次,开展外因火灾监测与远程自动控制救灾风门应急处置、内因火灾监测与温控胞衣阻化剂防灭火应急防控等人机交互试验实训;最后,建立综合评测的试验评价体系用于考核评估。结果表明:该试验系统具备虚拟现实沉浸性、交互性、构想性的技术特点,利于打造井下三维虚拟仿真场景,逼真展示矿井火灾演变过程;在试验与实训方面,可以突破传统模式在时间、空间、安全、资源等方面的限制,提供自主学习与多元评价方式。

电厂锅炉实验虚拟仿真系统建设与应用

为开展能动专业核心课程“锅炉原理”的实验教学,校企合作开发了电厂锅炉实验虚拟仿真系统。基于两相流动与辐射对流传热原理构建的仿真系统,由风烟和汽水两大模型构成,严格遵守质量、能量、动量守恒方程。变负荷虚拟实验显示,随锅炉负荷增加,热效率降低、燃料耗量增加。根据辐射传热原理,结合火焰平均温度计算发现:只有炉膛出口烟温增加,才能保证炉膛传热负荷增加,继而抬升排烟温度,导致排烟热损失变大、锅炉热效率降低。锅炉原理实验虚拟仿真,可训练学生运用锅炉本体热力计算原理分析问题的思维,是落实创新能力培养的重要举措。

土木工程虚实结合实验教学体系化标准化矩阵构建与应用

通过引入虚拟仿真实验,可以重塑土木工程专业实验课程体系,在人才培养中起到重要支撑作用。然而,现有的土木工程专业实验教学存在体系化不足的问题,导致大量虚拟仿真实验项目重复建设,且难以融入实验教学。同时,现有的毕业生应具备的实验能力未能达到“基于高等学校土木工程专业评估(认证)标准”中的毕业要求,与实际实验能力培养要求存在一定差异。从系统化和标准化两方面,建立了包含学生专业实验能力培养核心支撑要素、学生专业核心实验能力及其关联矩阵的土木工程专业实验教学体系化标准化矩阵,介绍了体系化标准化矩阵的应用,相关成果可为土木类高校提供参考。

基于VR技术的危化品物流虚拟仿真实验体系设计与实践研究——以N学院为例

危化品物流对安全措施有着高等级的要求,其一线场地和设施无法面向师生开放。应用型高校将虚拟现实技术应用于危化品物流实践教学中,可解决安全壁垒问题、提高实验设施的投资效益、激发学生的学习兴趣、鼓励学生参与创新实践并拓宽社会培训路径。文章立足于宁波舟山港和石化园区对危化品物流的现实需求,系统地分析了应用型高校建设危化品物流虚拟仿真实验教学体系的设计思路与实践内容,在功能上满足了专业实验、创新研究、学科竞赛、社会培训等多元化需求,既满足了高素质应用型人才的培养要求,也为类似高校实验体系的构建提供了参考。

水泥石微结构电子显微镜虚拟仿真观测实验教学研究

水泥混凝土材料微结构与宏观性能的关联是土木工程材料课程教学的重点和难点。当前,材料微结构观测实验存在设备昂贵、线下教学资源有限、样品制备难等问题,难以面向本科教学开展线下实验教学,导致学生对材料微结构及微结构-宏观性能关系理解不深入。基于此,开发电子显微镜虚拟仿真微观结构实验平台,设计巩固理论知识与训练实践能力相结合的虚拟观测实验项目,通过材料宏观性能与微观结构的对比,帮助学生更加深入理解水泥基材料的特性,建立知识体系,提高本科人才培养质量和实践创新能力。

建筑环境与能源应用工程专业虚拟仿真实验系统建设与示范

重庆大学土木工程学院依托国家级实验教学示范中心,对建筑环境与能源应用工程专业空调冷热源系统、大型通风空调系统等成本高、危险性高、周期长的实验内容进行虚拟仿真实验教学系统建设,共建设了空调冷热源系统、空调系统、热水供暖系统三个综合虚拟仿真实验系统。实验建设紧密围绕建环专业实践教学体系展开,坚持“能实不虚、虚实互补”原则,以培养解决复杂工程问题、具有创新思维、高素质综合型工科人才为目标。实验内容设置综合性的多工况虚拟实验、事故工况实验和科研创新实验,支撑了完整的实验教学过程,并建立了双向评价体系。实验采用Web端在线实验形式,提高实验的便捷性和共享性。2020—2021年,虚拟仿真实验系统除服务本校本科实验教学外,向4个高校超300名学生提供实验教学服务,获得校内外较高评价,产生了良好的示范和社会效益。

干式空心电抗器匝间过电压绝缘检测实验虚拟仿真教学系统设计与开发

针对学生在干式空心电抗器匝间过电压绝缘检测实验教学过程中存在的危险性大、成本高、消耗高、特高压等问题,应用虚拟仿真技术,通过视景建模与仿真运行,高度还原变电站营运环境,设计和开发了干式空心电抗器匝间过电压绝缘检测实验虚拟仿真教学系统,包含实验仿真、实验考评以及实验服务。教学系统采取虚实结合的方式,推进现代信息技术融入特高压实验教学,激发学生的实验兴趣,取得了良好的教学效果,实现学生工程实践、问题分析、科学研究等能力的提升,对培养学生的创新意识和科研能力发挥重要作用。

基于虚拟仿真技术的足式机器人创新实验平台开发

为满足足式机器人教学实验需要及提高实验平台可靠性,研制了一种基于虚拟仿真技术的足式机器人创新实验平台。该实验平台基于PyBullet虚拟物理引擎搭建,通过设计步态规划、步行控制等功能模块,能够完成足式机器人步态规划、步行控制等算法的仿真验证等任务。同时,依托该平台展示涉及机械设计、软件开发等专业方向的教学内容,有利于智能机器人课程实践教学的开展。基于该创新实验平台,设计了一个拥有13个自由度的足式机器人,能够完成自主步行、上楼梯等功能。实践表明,该创新实验平台具有实验成本低、高度可定制化的优点,非常适合科学研究和实验教学中需要个性化定制机器人的应用场景。

计算机组成原理虚拟实验教学改革

为了克服传统计算机组成原理实验教学存在的问题,改善实验教学效果,设计一种计算机组成原理课程虚拟实验体系是非常有必要的。本文提出了一种基于Logisim的计算机组成原理的实验教学体系和教学模式,列举了基于Logisim的实验教学内容,并将该体系应用于实际教学中,设计了整个实验过程的教学管理。实践的结果表明,采用计算机组成原理课程虚拟实验体系能够提高实验教学的效果,学生能够获得更好的学习体验,并可以为其他同类课程提供借鉴。

机械原理虚拟仿真实验教学系统的设计与实现

针对“机械原理”课程实践性强的特点,设计开发了一款虚拟仿真实验教学系统,该系统包括平面机构认知、平面连杆机构、凸轮机构、齿轮传动、动平衡原理5个模块。该系统实现了机械零部件的三维动画展示、各类机构的运动仿真模拟、实验设备的虚拟拆卸安装、实验装置各参数的虚拟测试等功能,该系统交互性、趣味性强,有助于提高学生的学习积极性和主动性。

基于脑机接口和虚拟现实游戏的空间认知训练实验系统与验证

空间认知能力被认为是人类正常生活所必备的重要能力,适当的训练可以帮助认知功能受损的老年人提高空间认知能力。该研究旨在探讨如何借助虚拟社区公寓游戏、脑机接口(BCI)和虚拟现实(VR)技术来提升认知障碍老年人的空间认知能力。研究方法包括基于空间认知理论、使用VR头戴设备HTC VIVE Focus的虚拟社区公寓游戏设计,以及对脑电信号进行功率谱密度特征提取和支持向量机(SVM)分类分析。在行为数据分析结果中,随着实验者训练次数的增加,完成任务所需的时间明显减少。整个训练周期中,完成任务的时间成本总体呈下降趋势,同时任务准确性逐渐提高。从而表明受试者经过训练后的认知能力得到有效提升。利用功率谱密度提取脑电信号特征,并采用SVM和极线学习机(ELM)进行信号分类,发现在Alpha2频段,SVM的平均分类准确率逐步上升,这为游戏对空间认知有积极影响的观点提供了明确支持,受试者通过游戏训练显著改善了空间记忆和其他认知能力。研究结论表明,基于空间认知理论的VR训练游戏对提高老年人的空间认知能力具有显著效果。该系统结合科学理论和VR技术为认知障碍康复与个性化训练开辟了新途径,预期将提升老年人生活质量并推进医疗康复技术的创新。

基于VR的计算机硬件维护实验系统的设计与实践

文章介绍了基于VR(虚拟现实)技术的计算机硬件维护实验系统的设计与实践。该系统旨在为学生和技术人员提供一个具有高度交互性的学习平台,以培养他们的计算机硬件维护技能。结合VR技术,用户可以在仿真环境中模拟实际的硬件故障和维护操作,无需真正的硬件设备。

Temperature field simulation technology for thermostat electromechanical systems

Temperature field control of electromechanical system with constant temperature is one of the important factors that affects the accuracy of the system. Traditional ways of temperature detec- tion cost a lot but have low responding sensitivity. To solve this problem, temperature field simula- tion using numerical simulation was done toward the electromechanical system, and the platform temperature field distribution as well as the process of the platform reaching the steady-state was an- alyzed. The research shows that the system temperature observing parameters are all within normal range and the temperature control structure is rational. In all, the research achievements have some engineering and theoretical values in improving the design of temperature control device and system accuracy.