基于多核异构模式的紧凑型贴片机专用控制器的研究

针对目前紧凑型贴片机缺少专用的低成本控制器的现状,提出了一种基于多核异构模式的专用控制器。并完成了控制器总体设计和上位机软件的开发。该专用控制器包括三个功能模块和Android控制平台。功能模块分别是运动控制模块、I/O模块和数据采集模块。三个模块间采用增强型总线通讯,实现主从机交互。Android控制平台作为控制器核心,进行数据的调度与处理,并承担视觉系统的中枢。最终经过软件测试和样机测试,实现了设计目标,证明该控制平台具有可行性,可以良好地应用于紧凑型贴片机。     

基于PAC的多轴运动控制系统的研究

运动控制是自动化设备的核心技术,而PAC代表着可编程控制器的最新发展.论述了PAC系统和基于PAC的运动控制的定义;提出一种基于PAC的多轴运动控制系统方案;阐述了其的特点和优势;并以泓格公司的I 8094运动控制模块为例,介绍了其应用思路.     

基于PMAC的贴片机控制系统的设计

介绍应用PMAC运动控制器进行贴片机运动控制系统设计，具体阐述了对于PMAC功能在贴片机上的合理使用，以及贴片机运动控制系统的软硬件设计。     

基于PAC的多轴运动控制系统的研究

运动控制是自动化设备的核心技术，而PAC代表着可编程控制器的最新发展。论述了PAC系统和基于PAC的运动控制的定义；提出一种基于PAC的多轴运动控制系统方案；阐述了其的特点和优势；并以泓格公司的I 8094运动控制模块为例，介绍了其应用思路。     

基于视觉的高速高精度贴片机运动控制系统的设计与实现

针对全自动贴片机高速高精度运动控制方面的问题,借鉴目前国外先进贴片技术,系统地分析了贴片机运动控制系统的特点和功能。详细讨论了不同的图像采集方式对整机性能的影响以及移动采图方式对速度控制精度的要求,并介绍了贴片机运动控制系统的具体实现方法。     

基于Opto22 PAC控制器的多晶硅铸锭炉控制系统设计

为了提高多晶硅铸锭生产过程的自动化程度,设计了一种基于Opto22 PAC控制器的自动化控制系统。系统采用PAC控制器和上位机组态的控制方式,生产的整个过程由PAC控制器自动控制完成,在上位机软件中对整个生产过程进行监控,并能对部分控制参数进行在线修改。PAC控制器通过100Mbps以太网卡接入本地局域网,系统可以实现远程/本地两种控制方式,系统管理员可以远程监控各个设备的运行情况并可对设备进行操作。整体系统可以稳定运行,提高铸锭的生产效率和设备的自动化程度。     

食品包装机械过程运动控制系统

为了提高食品包装机械过程运动控制的自适应性，设计基于LabVIEW实时模块的食品包装机械过程运动控制系统。通过设计食品包装机械过程运动控制系统总体架构，采用层次化、模块化的体系结构设计方法，分析系统参数技术指标，在此基础上，设计系统硬件结构模块及通信外设部分，主要包括原始数据采集模块、食品包装机械过程运动信息模块、AD信息集成控制模块、时钟周期振荡模块以及LabVIEW实时运转状态分析模块等，并结合PLC控制器、伺服驱动器、编码器，进行食品包装机械过程控制，采用LabVIEW总线传输控制技术对驱动负载控制，通过人机界面交互的方式实现基于LabVIEW实时模块的食品包装机械过程运动控制系统设计。测试结果表明，所设计系统的食品包装机械过程运动控制误差率在5%以内。基于LabVIEW实时模块的食品包装机械过程运动控制系统进行食品包装机械过程运动控制的精度较高，过程稳定性较好。     

基于DSP和FPGA的运动控制器

为了满足开放式运动控制器的设计要求,给出了一种基于数字信号处理器（DSP）和现场可编程门阵列（FPGA）的四轴通用运动控制器设计方案,详细论述了该四轴通用运动控制器的体系结构特点、硬件电路设计、FPGA模块分析和软件模块组成;系统结合PC／104模块化设计思想,基于TMS320F2812DSP外部总线的设计,采用高性价比FPGA芯片EP2C5实现了运动控制专用外设模块,使系统具有结构简单、低成本、开放性、模块化特点,而且总线上各模块可独立设计,亦降低了系统实现难度。实际应用结果表明,该控制器具有良好的性能。     

罗克韦尔控制器添新品

罗克韦尔自动化的Allen-BradleyControlLogix系列控制器新增两款产品,均采用公司集成架构系统中的统一设计环境和网络协议。ControlLogix L73和L75可编程自动化控制器(PAC)具有先进的存储器、速度和处理能力,可满足从高性能逻辑及运动控制     

多功能贴片机系统管理软件设计及实现

针对多功能贴片机的高速、高精度和控制需求,本文分析了贴片机系统管理软件的整体架构和三个最重要的核心模块:PCB数据管理、视觉检测及定位、运动控制;本文重点介绍了三个核心模块的有关程序实现技术及主要视觉算法实现。该系统管理软件在研制的多功能贴片机样机上得以初步应用。     

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.