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。     

基于PLC和MCGS的全自动酥皮机控制系统

介绍了酥皮机的工艺流程及控制要求,分析了控制系统硬件和软件设计方法,提出了以西门子S7-200系列PLC及MCGS嵌入式一体化工控机(触摸屏)为核心的全自动酥皮机控制系统。实际应用表明,系统可靠,效果良好,人机界面功能友好。     

码垛生产线物流控制系统设计

针对娃哈哈公司的码垛生产线,设计了一套以西门子PLC为控制核心,采用西门子人机界面作为人机交互工具的物流控制系统。该系统实现了产品整列控制、栈板输送控制、系统的实时监控等功能。从系统总体结构、控制系统硬件设计、控制系统软件设计、人机交互界面等方面进行了详细的介绍。经过调试测试投入运行后系统运行可靠、参数设置简便、监控界面明晰,为企业提高生产效率、改善劳动条件、优化作业布局做出了贡献。     

风电叶片根部切割打孔设备控制设计与实现

对大型玻璃纤维风电叶片根部切割打孔设备控制系统进行技术方案设计研究,以西门子可编程控制器SIMATIC S7-226CN为核心,采用人机界面、伺服运动控制、变频器调速、MODBUS通信控制技术,实现大型玻璃纤维风电叶片根部切割、打孔。阐述了设备主体结构功能及风电叶片根部加工工艺流程,提出控制系统设计方案,并着重描述控制要求和操作功能,给出了硬件电路和软件程序设计。实际应用表明,该设备性能稳定,切割、打孔精度均满足设计要求,并具有良好的可扩展性。     

西门子840D sl数控系统在SC125大型车铣镗床技术改造中的应用

针对罗马尼亚SC125大型车铣镗削机床的结构特点,介绍了数控系统、伺服系统、辅助控制系统和液压系统及机械系统技术改造的具体内容。数控系统采用新型西门子840D sl,电气伺服系统采用西门子S120及1FT6交流伺服电动机,辅助控制系统采用s7 300 PLC,转台液压系统改造成为恒流静压系统。采用840D sl数控系统实现了车削和铣削两种控制方式的操作,通过机电液压系统的总体设计、安装、调试,使机床控制功能、高可靠性、高精度等各项技术指标均经达到了更高的设计要求。     

基于触摸屏的柔性生产线物流运输控制系统的设计

基于柔性生产线中立体仓库和运输小车的结构及其可视化控制的要求,设计并实现了功能强大、界面友好的控制系统。控制系统硬件主要基于西门子SIMATICs7200系列可编程逻辑控制器（programmable logic controller, PLC ）,同时引入人机界面友好的触摸屏eview—MT5000;软件分别选用西门子Step7编程软件和EV5000触摸屏编程软件。控制系统经实验室模拟柔性生产线测试,结果表明设计的控制系统运行稳定可靠,实现了对立体仓库系统和运输小车的实时监视和控制。     

西门子数控系统840D人机界面的制作方法

西门子SINUMERIK 840D数控系统的人机界面是标准的操作界面,其对有特殊加工要求的用户很不实用.主要介绍了实现人机界面制作的方法.阐述了以西门子OEM开发包和西门子HMI软件开发包为工具,利用微软VC创建西门子数控系统相关的语言动态链接库,利用微软VB高级语言将用户的特殊界面嵌入西门子系统中,在通用数控系统上实现制作专业的人机界面(HMI)的方法.     

阳煤三矿副井提升机电控系统的改造研究

以阳煤三矿副井提升机为例进行了电控系统的优化改造。针对阳煤三矿副井提升机电控系统的实际情况,应用了ACS800四象限变频器,采用了西门子S7组成的现场总线控制系统、双PLC冗余、远程I/O、西门子WINCC人机界面实现系统运行的实时监控。改造后的副井提升机电控系统安全性和稳定性得到了提高,实现了全数字化智能型监控,能有效保障副井提升机安全运行。     

基于PLC的十字滑台钻孔机组态模拟设计

十字滑台钻孔机的监控控制系统由西门子PLC、伺服系统和人机界面触摸屏等硬件组成。在该系统的硬件上编写PLC程序,脉冲输出实现伺服驱动轴的定位功能,实现精准孔定位加工;并应用MCGS组态软件对整个监控控制系统进行实时监控和模拟仿真,使钻孔加工过程更快捷、准确,调试和维修更方便。实践证明,将西门子PLC和MCGS组态软件结合可以非常好地进行远程监控与仿真,系统的运行状况良好,具有良好的应用价值。     

基于PLC的全位置TIG焊机控制系统设计

分析了全位置TIG焊机结构，重点研究了焊机的控制系统。根据TIG焊的特点，为满足其焊接工艺要求，控制系统硬件主要由西门子S7-1200系列PLC、威纶通触摸屏、伺服驱动系统等组成，综合运用PID算法控制实时调节焊接电流，保证焊接过程的时序性，实现闭环系统信息控制功能，并给出了程序设计方法及流程图，完成了人机界面的设计。通过工业现场表明，该控制系统具有可靠性高、稳定性好、操作简便等特点，焊缝成形质量优，满足管管焊接生产工艺要求。     

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.