OpenGL在虚拟数控加工中的应用

利用VC环境下OpenGL绘制三维模型的方法,实现数控机床虚拟制造,解决从实验室到现场操作的不便。详细介绍将机床模型从3DS MAX转换到OpenGL的过程,该方法克服了3DS MAX编辑模型的不可交互性,同时简化了Open-GL中建模的复杂过程。另外,在VC环境下,做出虚拟的操作面板、参数设置对话框,增加了沉浸效果。     

基于openGI的仿真机器人系统建模设计

对仿真机器人系统进行建模设计．系统以OpenGL和Visual C 6．0为开发平台．分别利用VC 下的OpenGL对机器人进行环境建模,利用3DS MAX来构建机器人模型,利用OpenGL中的函数实现环境的绘制以及实现仿真机器人的行走。     

基于3 DS Max与OpenGL的数控车床仿真技术的研究

提出了数控车仿真系统的总体结构,详细论述了基于3 DS Max与OpenGL的数控车床仿真的实现方法。该系统采用3 DS Max对静态部件进行几何建模,并存为3 DS文件格式,然后利用OpenGL接口技术将3 DS文件导入仿真环境,用重画技术对动态物体进行行为建模,从而模拟整个数控加工过程。     

虚拟现实技术在医学手术中的应用

虚拟现实技术在医学手术中的应用将使得术前环境能模拟,术后效果可预测,模拟操作整个手术过程,因此虚拟技术近年来在医学上得到更多的重视。在此将虚拟技术与医学临床相结合,首先在3DS MAX中完成人物面部唇裂畸变形态的建模,将得到的头部模型导入EON虚拟现实软件进行面部数据处理,应用虚拟现实技术的强大功能,完成医学手术过程的三维虚拟仿真,以达到人机交互效果,创立动态的、直观的、可手术模拟、可预测术后效果、个性化的唇裂修复三维多媒体平台。     

基于OpenGL与六维控制器的并联机器人动态仿真

为了实现对计算机中虚拟并联机器人模型进行实时控制和动态仿真分析,介绍了基于微动结构设计的微动六维控制器和OpenGL这一开放式的三维图形标准,给出了建立OpenGL在Visual C++6.0中绘图环境的方法,以及六维控制器和计算机实现串口通信的具体方法。最后以3R&2P并联机器人为例,以机器人运动学反解为基础,依次建立关键部件三维模型并实现了关联运动,运行结果表明OpenGL技术非常适合于机器人的三维运动仿真,同时结合六维控制器能够实现实时的动态仿真分析。     

虚拟数控技术在铣削加工过程中的研究

叙述了虚拟数控技术的发展现状及发展趋势.通过在VC平台上采用OpenGL技术建立虚拟加工环境,提出了数控铣削加工过程仿真系统结构及功能,同时在虚拟数控铣削加工过程中建立模型,从而进行虚拟环境下的几何仿真和物理仿真,实现产品的虚拟制造.     

基于三维数字技术实现对场馆、景点的虚拟漫游

以3DS MAX和VRML软件为工具,为某展览馆设计了虚拟漫游导游系统,探讨了对虚拟场景中不同景观的不同建模方法和基于VRML软件的漫游系统的功能实现.     

浅谈OpenGL在机器人三维仿真的应用

介绍对运动机器人进行三维实时科学可视化仿真的过程。采用目前流行的可视化仿真软件OpenGL．它具有优秀的场景和实时处理能力，同时为克服其不能绘制复杂三维模型的缺点，还引入三维建模软件3DSMAX，先用建模软件来建立机器人的逼真模型，再将模型数据读人到OpenGL中，同时结合可视化软件编程工具VC＋＋成功实现对运动机器人的实时三维可视化仿真。     

基于OpenGL的虚拟制造物理层仿真平台的建立

通过构建OpenGL三维绘图环境和3DS模型文件的C 加载类,驱动3DS模型文件,建立虚拟制造模拟平台,从而实现虚拟制造的物理层可视化仿真.并对钻床加工过程进行了模拟仿真,通过仿真对预定运动控制方案的可行性给出模拟验证,并对预定控制方案的可行性给出评估.     

基于VC＋＋与OpenGL的非球面光学零件加工过程仿真研究

论述了基于OpenGL技术,Visual C＋＋6.0作为开发工具的非球面光学零件的虚拟加工设备的建模、设备仿真的实现方法,运用实体几何法构造机床以及各个加工模块的三维模型,构建非球面光学零件加工设备的虚拟加工环境;基于MFC调用OpenGL虚拟机床的加工过程,形成可视化运动仿真。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.