基于运动控制卡的料斗自动焊机控制系统设计

为实现斗式提升机关键零部件料斗焊接过程中的自动化控制,将运动控制卡和VB6.0软件应用于料斗自动焊机控制系统的硬件配置和软件实现中,并系统阐述了料斗自动焊机控制系统的硬件、软件的组成与实现。控制系统采用"PC+运动控制卡"的两级结构。VB6.0软件开发的人机交互程序,通过调用运动控制卡内的运动控制函数,动态改变脉冲信号,控制电机的运动,实现焊接平台的精确控制。控制系统可以完成各轴状态实时显示、焊接路径规划、焊接参数调节等任务。     

基于开放式数控系统专用焊机的研究与设计

本文设计了一种适合回转类零件的焊接专机,提出PC+运动控制卡结构,此结构的数控系统是在通用PC机的扩展槽中插入运动控制卡或整个(N(单元(包括内嵌式PLC),P(机实现文件管理、用户接口以及通信等非实时部分的功能,实时控制由插入P(扩展槽中的(N(单元或运动控制卡来承担.同时,采用2D激光位移传感器,测量焊缝数据,通过串口传到控制系统,实现了实时测量,实时焊接,提高焊接质量.研究的焊机实现焊接过程的稳定、可靠,为开放式焊机设计,控制提供了依据.     

基于LabVIEW的运动控制卡的开发与应用

针对一种"PC机+运动控制卡"的控制系统进行研发。该系统以PC机、运动控制卡PCI-1243U、动态链接库函数和Window s操作系统等作平台为基础。采用Lab VIEW开发人机交互界面,采用导入共享库的方式调用动态链接库,实现对运动控制卡的驱动,驱动器控制电机动作,实现了运动控制要求。该系统方案在运动控制系统方面有着广泛地运用,开发周期短、成本低、实用性好、可扩展性高。     

基于Galil控制器六自由度机械手的开发与应用

研究了基于Galil运动控制器的六自由度机械手控制系统软硬件方案。控制系统采用"PC+Galil"硬件构架平台,以PC机作为上位机,实现运动控制、轨迹规划及后台管理与运算等工作,以Galil作为下位机实现前台实时运动控制与检测。利用GalilTools软件在线整定了伺服系统的PID参数,优化系统的性能。利用微软的Visual Studio 2010软件开发了上位机人机操作界面,实现上位机与Galil运动控制卡之间的数据通信。实验结果展示控制系统具有良好的动态性能。     

基于PLC的高速铣削实验台集成控制系统设计

文章利用现有的高速电主轴、刀库等实验设备构建一个可自动换刀的高速铣削实验台,结合其特点和控制要求,采用"PC+PLC"的结构形式研究和开发了一套基于PC机的高速铣削实验台集成控制系统。该系统用PLC实现前台主轴、刀库、运动控制和切削参数采集功能,用PC机实现人机界面及后台管理,并通过PC机与PLC之间的通信完成整个系统的控制任务。实验结果表明,所开发的高速铣削实验台集成控制系统系统运行良好,操作方便,人机界面友好,能够实现控制高速铣削实验的控制要求以及切削力和切削温度的检测要求。     

遮蓬连杆机构的设计及其运动控制

根据平面组成原理的变异叠加理论,利用连杆或连架杆的运动特点,设计了遮蓬连杆机构.该机构是由单自由度平面六杆机构组成,以滑块为主动件,电动推杆作为往复运动的电力驱动装置.提出了运动控制采用"PC 运动控制器"模式,编制了固高GT-400-SV运动控制器作为下位机的双CPU的硬件结构和基于VC语言、Windows操作系统的软件程序,PC机为上位机,从而实现特定的运动控制要求,达到窗扇的自动开闭.     

多功能数字化立管焊机控制系统

针对石化产品管内壁堆焊的主要特点与工艺流程,设计出以高性能PLC为控制核心,配备触摸屏、伺服定位系统、弧压检测与处理系统、无限回转机构、自动寻位系统,以及自动焊接三维滑架等组成的多功能数字化立管焊接设备。经过现场试验与实际产品焊接,该立管焊机控制系统的抗干扰能力强,系统运行稳定,自动化程度高,运算性能优越,扩展性强。     

球阀静压寿命试验控制系统的研制

介绍了用于对球阀进行静压寿命试验的控制系统.该系统采用"PC+运动控制卡"的控制方案,运动控制卡产生模拟量信号对伺服电机扭矩控制,通过减速器带动球阀的手柄(轮)进行循环启闭动作.PC机作为上位机使用VC++设计人机交互界面软件,对试验过程各参数进行设置及实时监控.实际使用表明,该系统具有操作简单、自动化程度高,可靠性高等优点,且系统控制软件具有开放性,容易进行移植,方便对系统进行维护和操作.     

基于485总线和ZigBee的滚焊机控制系统

异形管钢筋骨架自动变径滚焊机是生产钢筋骨架的主要设备之一,该设备中被控电动机的数量多、种类多,且I/O点数多,其控制系统结构复杂。基于485总线和ZigBee技术开发了一种高可靠性滚焊机控制系统,该系统中每个执行机构均有基于485总线的独立底层控制器,将运动控制功能和I/O点控制功能分离,同时利用ZigBee技术实现了对滚焊机主花盘上48台电动机的无线控制,既避免了电动机随着机构旋转而产生的接线缠绕问题,又满足了控制系统的功能需求。该系统实现了钢筋骨架全自动焊接、焊接参数的采集和显示、滚焊机运行过程的图形化显示以及故障报警等功能。实验结果表明,该控制系统运行稳定可靠,实时性好,具有很好的实用和推广价值。     

基于CAN-bus的自动焊接控制系统设计

在一款法兰自动焊接系统的设计中,涉及到多轴伺服运动和多个气动装置的控制。针对此焊接系统的控制需要,设计了基于CAN-bus的PLC分布式运动控制系统。     

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.     

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。     

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....     

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.