基于EON Studio的柴油机虚拟维修训练系统研究

以M11柴油机为研究对象,分析了基于EON Studio开发虚拟维修训练系统的过程,研究了三维建模与优化、整机漫游与多视角观测、工作原理展示、虚拟拆装训练的设计和人机交互等内容。对柴油机的结构组成、工作原理及维修保养过程进行了系统的规划,使受训人员在逼真的虚拟环境下熟悉训练对象和训练任务,提高训练效果。     

推土机保障虚拟训练系统的设计与实现

在分析推土机结构性能特点的基础上,基于模块化的设计思想,依据系统功能需求,构建保障训练系统平台.研究了推土机保障虚拟训练平台和维修仿真的实现过程,包括虚拟样机建立、保障任务科目规划、维修知识数据库构建及交互控制方法设计等内容,结合训练应用的实际需要,开发了一种推土机保障虚拟训练系统.结果表明该系统对课程设计和教学应用有良好的指导意义和实用价值.     

交互式工程车辆虚拟维修训练系统设计

传统的实装维修训练成本高,时间长,且易造成安全事故。针对上述问题,设计基于EON的交互式工程车辆虚拟维修系统。规划了虚拟维修训练系统的结构框架,设计了交互式控制操作方式,并以装配模块和零件识别模块为例,说明了该虚拟维修训练系统交互功能的实现方式,验证了设计方法的有效性。     

基于半实物仿真和虚拟维修的维修训练系统设计

为了解决电子装备维修模拟训练的问题,提出基于分布式系统将半实物仿真技术和虚拟维修技术相结合的地空导弹电子装备维修模拟训练系统实现方法,并完成了系统设计。该系统用半实物仿真的方式实现装备操作训练,用虚拟维修的方式实现装备维修训练,维修效果在半实物仿真平台上体现。系统以较低的训练成本提高了维修模拟训练的沉浸感,为维修教学提供了一种有效的手段。     

面向复杂装备维修的虚拟现实集成平台

针对复杂装备提出虚拟现实维修训练平台研发的关键技术和具体内容,主要包括虚拟维修集成平台共享云资源挖掘提取技术,虚拟维修集成平台人机交互多情景跟随融合技术,虚拟维修集成平台多元学习与训练策略设计技术,虚拟维修集成平台案例重构与多向反馈评估方法。     

桌面式工程机械虚拟维修训练系统技术研究

分析了面向设计任务与面向训练任务中虚拟现实技术应用目的和要求的不同,基于维修培训任务的特点和要求,应用桌面式虚拟现实技术,设计了虚拟维修训练系统的功能模块.介绍了桌面式虚拟现实技术的交互控制原理,并阐述了拆装训练、故障诊断训练及训练考核评价3个主要功能模块的设计思路及技术实现方法.开发了某型装载机虚拟维修训练系统,验证了方法的有效性.     

某型火箭布雷车虚拟维修训练系统的设计

某型火箭布雷车技术先进、结构复杂,使用、维护、保养训练难度大,在此背景下基于虚拟现实技术研制了该装备的虚拟维修训练系统。采用了操作信息流与系统故障树协同的建模方法,构建嵌入流程层、数据层、步骤层和方法层的故障诊断维修框架。维修训练软件平台基于Unity3D虚拟现实平台开发,实现布雷车维修训练过程与三维场景的实时展示,为受训人员提供逼真、准确的虚拟维修作业环境。实践证明,将虚拟现实技术、故障树技术和故障诊断技术应用于维修训练教学中,可有效地提高训练效率和教学效果。     

基于EON Studio的虚拟维修训练系统研究

文章概括了基于EON Studio开发虚拟维修训练系统的过程.涉及到虚拟现实与仿真技术,重点概括了进行虚拟维修训练系统开发的步骤,以及复杂交互功能的实现等问题的解决方法,对虚拟维修训练系统的研究开发提供了技术支持.     

基于Unity3d的柴油机虚拟仿真训练系统研究

为解决传统柴油机培训过程中存在的问题,基于Unity3d建立了一套柴油机虚拟仿真训练系统。利用3dmax建立了某型柴油机的三维模型,结合平时教学过程的需要,利用Play Maker插件实现柴油机的虚拟拆装,利用C#语言建立柴油机运行的仿真数学模型,实现对柴油机的虚拟操作训练。实践证明,该系统具有良好的三维展示功能和仿真训练功能,在教学过程中能起到较好的作用。     

基于EON Studio的柴油机虚拟保养训练系统的研究

以康明斯M11柴油机为研究对象,设计了一种实用的虚拟保养训练系统.通过综合建模方法对M11柴油机进行三维建模及材质编辑,导入到EON Studio虚拟软件中进行日常保养项目的虚拟训练设计,包括机油更换、发电机皮带张紧度检查以及冷却系统清洗等,并实现了柴油机漫游视角观察与结构原理展示.测试表明：该系统能够明确地指导参训人员进行柴油机日常保养项目的训练,具有良好的人机交互性与可操作性.     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.