Research and Simulation of Parking Resource Sharing Mode in Old Community—Taking Yingmenkou Community as an Example

In recent years, the number of permanent residents in Chengdu, Sichuan Province, China has continued to grow, and the number of private cars keeps rising. A series of problems caused by difficult parking and random parking in old communities are common. This paper will take the parking problem of the old community in Yingmenkou community, Chengdu, China as an example to summarize the current situation and parking problems of the private car parking facilities in these old communities. Based on Chengdu’s current old community parking management policy, parking facility renovation and expansion policy, this paper researches and establishes a parking resource sharing model suitable for old communities. The simulation results show that this model has a small footprint and is easy to install and disassemble. It can be freely spliced and combined units according to the size of the old community and the needs of residents. It is suitable for old communities with no centralized parking lot and high parking demand by residents.

基于Solid Works Flow Simulation的球阀内部流场仿真模拟研究

为了了解流体在球阀不同开度下的流动状态及对应的流阻系数,应用商业软件Solid Works Flow Simulation对球阀不同开度的三维流场进行数值仿真模拟和可视化研究。模拟结果表明,在开度较小的情况下,阀芯横截面流速沿中心线呈对称分布,阀芯内部流场存在一对尺寸相等、方向相反的漩涡,且这对漩涡基本占据整个流道;同时出口管路也存在强烈的涡流,随着球阀开度的增大,流动达到稳定,漩涡消失。利用数值模拟结果,求解不同开度下球阀的流阻系数,并与实验拟合公式结果进行对比,验证了数值模拟方法的可靠性。根据球阀流阻系数与开度变化的趋势可知,当球阀开度增大到70%时,再增大开度对流阻系数的减小影响不大。模拟结果可为球阀结构设计和性能优化提供参考。

Simulation of global ocean acidification and chemical habitats of shallow-and cold-water coral reefs

Using the UVic Earth System Model, this study simulated the change of seawater chemistry and analyzed the chemical habitat surrounding shallow- and cold-water coral reefs from the year 1800 to 2300 employing RCP2.6, RCP4.5, RCP6.0, and RCP8.5 scenarios. The model results showed that the global ocean will continue to absorb atmospheric CO2. Global mean surface ocean temperature will rise 1.1-2.8 K at the end of the 21st century across RCP scenarios. Meanwhile, the global mean surface ocean pH will drop 0.14--0.42 and the ocean surface mean con- centration of carbonate will decrease 20%--51% across the RCP scenarios. The saturated state of sea water with respect to calcite carbonate minerals （t2） will decrease rapidly. During the pre-industrial period, 99% of the shallow-water coral reefs were surrounded by seawater with t2 〉 3.5 and 87% of the deep-sea coral reefs were surrounded by seawater with aragonite supersaturation. Within the 21st century, except for the high mitigation scenario of RCP2.6, almost none shallow-water coral reefs will be surrounded by seawater with g2 〉 3.5. Under the intensive emission scenario of RCP8.5, by the year 2100, the aragonite saturation horizon will rise to 308 m under the sea surface from 1138 m at the pre- industrial period, thus 73% of the cold-water coral reefs will be surrounded by seawater with aragonite undersaturation. By the year 2300, only 5% of the cold-water coral reefs will be surrounded by seawater with aragonite supersaturation.

Simulation and Millennials—The Perfect Storm

Simulation in its various forms has developed extensively over the past 15 - 20 years for use in undergraduate nursing programs. The widespread integration of technology-based educational tools into nursing curricula is raising concerns that technology rather than sound philosophically-based pedagogy is informing nursing education. Some believe that educational soundness has been overtaken by a focus on technological prowess. The manikins used in this immersive classroom often breathe, blink, and even speak in response to lecturer-controlled commands. This research explores how Millennials as a generational cohort (18 - 30 years of age) interface with the teaching/learning platform of simulation. This action research study is unfolded in three distinct action cycles involving 161 undergraduate nursing students. Millennial characteristics of confidence, high achievement, team orientation, technology focus, feedback-saturated, and trophy-seeking traits make them especially adept in immersive simulation environment. If supported by appropriate philosophical underpinnings, simulation as a teaching/learning platform has the potential to become the preferred classroom for Millennial nursing students.

Acquisition of Launch Vehicle Dynamic Characteristics Based on Numerical Simulation

and then in the absence of test data to establish the dynamic model.The issue was,how to accurately obtain the mode data of LM-8 with numerical simulations which directly affects the control reliability of flight.In this paper,various approaches to obtain the dynamic characteristics of LM-8 are described from the perspective of refined dynamic modeling and simulating,mode slope prediction,vertical modal test,etc.The numerical simulations were found to be in good agreement with the experimental data,and satisfied the requirements for the engineering application,which effectively supported the successful maiden flight mission of LM-8.

Research and Development of Simulator Specialy Used in Weaponry FMS P

Research and development of the simulator for special use in weaponry FMS,sponsored by Prof Wang Ningsheng,recently passed the technical apprasial organized in Peking by the Av iation Industries of China.

Perceptions on the Efficacy of Simulation

This qualitative case study addressed recent graduates’ perception of the efficacy of simulation in registered nursing education. Finding clinical placement is one of the greatest challenges faced by schools of nursing. One possible solution is to use high-fidelity simulation manikins to substitute for clinical experience. The research that exists regarding nursing simulation laboratory experiences focuses on improvement on exam scores and preparation for national board examinations. Very little research explores recently graduated nurse’s perceptions about the efficacy of simulation experiences. The conceptual framework for this study was the constructivist theory. This is a process of experience and reflection. It is a dynamic process that changes as the learner internalizes the experience. This study allowed the researcher to understand how recent graduates perceive the value of simulation experiences. Two research questions were identified: 1) How do recent graduates of registered nurse (RN) education programs view the simulation lab experiences from nursing school? 2) In what ways do the perceptions of simulation experiences differ between associate degree RN program graduates and bachelors program RN graduates? A case study research design was used to explore the perceptions of recently graduated RN about their experience with simulation. By interviewing recent graduates’ perceptions about their experiences with high-fidelity simulation in nursing school, and documenting their perceptions about the efficacy of those simulation experiences, information was obtained that might allow schools of nursing to increase the effectiveness of the simulation experience or validate its applicability in the real world setting.

Simulation and Experimental Study on Influence of Multi⁃port Integrated Hydraulic Transformer Port Number on Transformer Ratio Characteristics

The integrated hydraulic transformer has a compact structure and no throttling loss in the process of pressure regulation.It is widely used in the common pressure rail hydrostatic transmission system.The integrated hydraulic transformer is realized by designing more than three ports on the distribution plate,and the voltage transformation characteristics of the integrated hydraulic transformer with different port numbers are different.In this paper,the influence of port number on the pressure ratio of integrated hydraulic transformer was studied,and the pressure ratio characteristics of 3⁃ports,4⁃ports,and 5⁃ports integrated hydraulic transformer were obtained,and an experimental platform was built for experimental verification,which shows that the simulation results are consistent with the experimental results and provides a theoretical basis for the design of integrated hydraulic transformer.

基于Simulink平台的变压器纵联差动保护的仿真研究

电力系统实验综合性强、复杂且抽象难懂,实验仿真相较传统实验在电力系统实验教学中具有一定优势。采用Simulink仿真平台设计电力变压器纵联差动保护实验仿真。从已知案例出发做了相关计算,设计变压器、电流互感器等关键元件的参数,构建主电路仿真模型,分析变压器正常或区外故障时电流互感器在计算变比和选择变比情况对差动回路电流的影响、变压器内部短路故障时的差动保护等。通过参数计算、建模及实验仿真分析等过程,使得抽象问题具体化,展现了实验仿真灵活性、优越性、创新性等特点。

近十年我国高校虚拟仿真实验教学研究发展述评

自从2013年教育部开展国家级虚拟仿真实验教学中心建设工作以来,近十年我国高校在虚拟仿真实验领域产生了大量的研究新进展与应用新成效。采用CiteSpace软件分析CNKI数据库中2014~2023年的高校虚拟仿真实验或虚拟现实实验文献集合,挖掘了该领域研究的核心单位、作者与发文期刊;分析了高被引文献的特征。同时,基于关键词共现关系聚类,阐释了虚拟仿真实验研究的主要类别、发展历程和前沿领域,进而探讨了虚拟仿真实验教学的技术层次、覆盖学科、开发软硬件和发展趋势。研究得出,标准化、网络化共享平台和混合现实技术,是推动虚拟仿真实验新发展的重要技术途径。

基于PI参数的二阶线性自抗扰控制参数整定

线性自抗扰控制是一种不依赖于被控过程模型的控制方法,具有很好的工程应用潜力。目前,工业控制过程中大多采用PI控制器,为了确保由调试好的PI控制器平稳切换到线性自抗扰控制器,并使系统仍保持稳定状态,需要合理设置线性自抗扰控制器的参数。为此,在分析二阶线性自抗扰控制器的二自由度等效结构的基础上,推导出其反馈控制器与PID控制器的对应关系,给出一种基于现有PI控制参数直接获取二阶线性自抗扰控制初始参数的方法。最后,在MATLAB/Simulink平台上采用若干典型传递函数和双容水箱液位控制系统进行仿真研究,仿真结果验证了所提方法的有效性。

基于Proteus仿真的微机原理与应用研究性实验教学项目设计

实验教学是《微机原理与应用》课程教学的重要组成部分,针对实验内容单一、开放性与启发性不足等问题,开展了基于Proteus仿真的综合实验项目设计。该实验以电压报警系统的实现为目标,基于研究性教学思想设计了由电压采集、并行接口控制、电压值显示、声光报警以及紧急事件5个子实验项目构成的阶梯递进式实验内容,形成了以目标为引导的实验教学体系。实践证明,Proteus仿真软件能够充分发挥研究性教学思想,有效激发学生主动学习和自主实践的兴趣,提高运用理论知识解决综合工程问题的能力,对科学研究思维和创新实践精神的培养有着积极的促进作用。

水灾害和谐防控与智慧模拟研究框架与展望

随着环境加剧变化与科技快速进步,我国水灾害防控事业面临着新的机遇与挑战。为深刻认识水灾害治理与防控,结合国家水灾害防御重大需求,对我国水灾害治理历程进行梳理与阶段划分,提出水灾害(包括干旱、洪涝、水环境污染)和谐防控与智慧模拟研究的必要性,从指导思想、理论基础、关键问题、研究内容、应用实践和发展战略研究六个方面提出水灾害和谐防控与智慧模拟研究框架,并从水灾害防控理论完善、水灾害和谐防控研究、智慧应用前景探索三个方面提出未来研究展望,以期为水灾害防控工作和高质量发展提供业务支撑。

虚拟仿真和产教研融合建设“动物繁殖学教学实习课程”思政教学实践研究

“动物繁殖学教学实习”是动物科学的专业必修课,课程教学目的是使学生能够掌握一定的现代动物繁殖技术,培养服务于畜牧业生产及相关科学研究的创新型人才。广西大学动物繁殖学教学团队结合自身学科发展和课程特点深入挖掘思政元素,开展教育教学方法创新改革,将课程思政和育人元素融入教学,培养畜牧业高质量发展所需人才。本课程教学以立德树人为根本,建设虚拟仿真教学资源,进行课前、课中、课后的思政融合,虚拟仿真与传统课程融合,产学研融合的思政教学模式,建立课程思政的考评机制等实践策略,实施课程思政建设和改革,提升学生专业认同感,增强服务“三农”的责任和担当。

柴油引燃甲烷/氢气混合燃料发动机实验与仿真研究

基于光学发动机研究了5%柴油燃料比下,氢气比对柴油引燃甲烷/氢气混合燃料发动机的燃烧过程的影响。燃烧过程的自然光度图像由高速摄像机记录。结合光学实验结果,模拟微量柴油点燃甲烷和氢气混合物的燃烧过程。研究不同氢气配比下燃烧过程中缸内温度、OH基团和燃烧组分的变化过程。研究结果表明:氢气比的增加促进了燃烧,点火延迟时间和燃烧持续时间显著缩短,燃烧放热阶段提前;混合燃烧过程中首先在圆柱体边缘形成低温点,火焰在短时间内随着温度的升高而膨胀;在相同的氢气比下,随着进气压力的增加,点火延迟期减小;氢气比例的增加使得主要放热率波峰升高并变窄,逐渐从双峰放热变为单峰放热过程。

面向月球科研站任务的地月准实时遥操作模拟验证系统设计与关键技术研究

针对月球科研站任务地月遥操作需求和特点,设计地月准实时遥操作模拟验证系统,对其中的关键技术海量多尺度遥感数据环境感知、空地协同高精度定位、基于混合现实的预测仿真等进行了研究。提出了基于海量多尺度遥感数据的联合处理方法,环境感知数据融合可处理米级至厘米级环境感知结果;设计基于空地多运动平台协同定位的原型软件,空地协同地标约束下,定位精度不低于轨道器影像1个像素;开发了带有力觉反馈的预测仿真验证平台,在2~3 s变时延约束下可在仿真环境下协同演示遥操作过程,真实还原从端的遥操作作业场景,提高遥操作的执行效率和安全性。为地面人员的方案设计、操作手训练、故障处置等提供实时支持,为我国未来实施月球科研站任务筑牢基础。

农业高校虚拟教研室及虚拟仿真教学改革初探——以安徽农业大学食品专业为例

基于当前教育部对农业高等教育提出的相关要求,将农业高校虚拟教研室及虚拟仿真教学改革相融合,要对现行的教学方法进行完善,以期提升农业高校教育教学和人才培养成效。主要以安徽农业大学食品专业虚拟教研室及虚拟仿真教学改革为例,结合农业高校食品专业人才培养目标和要求,积极依托安徽农业大学食品专业基层教研平台,深入探索虚拟教研室、虚拟仿真教学组织建设及人才培养改革新模式。

抗半速12.7mm穿甲燃烧弹陶瓷装甲数值模拟与试验研究

为了研究半速12.7 mm穿甲燃烧弹侵彻条件下,陶瓷横向尺寸对其抗弹性能的影响规律以及陶瓷抗弹性能对支撑条件的响应,同时探究可实现有效防护的复合装甲结构,采用ANSYS/LS-DYNA有限元软件对弹体侵彻陶瓷复合装甲的过程进行数值模拟,并进行靶试试验验证。结果表明:随着陶瓷横向尺寸增大,其消耗弹体能量比例不断增加,当陶瓷尺寸增大至6倍弹径时,其消耗弹体能量比例基本稳定;陶瓷抗弹性能与其支撑条件相关,碳纤维对陶瓷的支撑作用大于PE对陶瓷的支撑作用;12 mm碳化硅+3 mm碳纤维+12 mm PE组成的陶瓷复合装甲可实现抗半速12.7 mm穿甲燃烧弹的有效防护。数值模拟分析结果和试验结果吻合良好,说明了数值模拟方法的正确性和模拟结果的有效性。

考虑消落带岩体劣化影响的典型危岩岸坡稳定性研究

三峡库区周期性水位升降引起的消落带岩体劣化对典型危岩岸坡稳定性具有重大影响。基于野外调研及地勘资料,采用通用离散单元法程序(universal distinct element code,简称UDEC)研究了消落带劣化区形态对近水平层状高陡危岩岸坡的稳定性影响。研究表明:目前三峡库区巫山段的近水平层状危岩岸坡消落带岩体劣化严重,在不同消落带劣化区存在紧密层状、松散碎裂状、溶蚀凹腔状、含挤压碎裂带等典型消落带劣化区形态;含有第1种消落带劣化区形态的危岩岸坡稳定性较好,危岩体位移较小,失稳模式为滑移破坏;含有第2种消落带劣化区形态的危岩岸坡危岩体先向坡内偏移,其后随着消落带岩体支撑强度弱化向坡外倾倒破坏;含有第3种消落带劣化区形态的危岩岸坡危岩体向坡外位移较大,失稳模式为倾倒破坏;含有第4种消落带劣化区形态的危岩岸坡稳定性主要受挤压破碎带的力学性质控制,易产生沿破碎带切割面的旋转滑移破坏;通过对以上4种劣化区形态的危岩岸坡增加防治加固措施,危岩体的变形位移得到了不同程度的有效控制。

城镇燃气管道小孔泄漏流量系数的定量研究

流量系数是影响泄漏速率计算准确程度的一个重要参数。针对目前小孔泄漏模型中流量系数经验性取值易导致泄漏速率计算结果与实际泄漏速率间存在偏差的问题,通过理论计算模型、气相小孔泄漏试验、计算流体力学(Computational Fluid Dynamics,CFD)模拟仿真相结合的方法寻求偏差产生的原因,并利用试验测试数据的拟合分析结果得到圆孔和矩形孔流量系数的定量计算模型。研究显示:在试验测试与模拟仿真中,小孔泄漏的流量系数主要受泄漏压力和几何形状的影响,在相同的泄漏压力和泄漏面积下,矩形孔的泄漏速率高于圆孔的泄漏速率。理论计算模型忽略了相关因素对流量系数的影响,将流量系数设为定值是导致泄漏速率计算结果出现偏差的主要原因。通过非线性曲线拟合得到的圆孔和矩形孔流量系数的计算方程,能有效修正气相小孔泄漏的理论计算模型,进而得到更加准确的泄漏速率,为气体泄漏后的扩散和风险评估提供理论依据。