基于DataSocket的数据与图像传输系统

针对测控网络中数据和图像的共享和传输,介绍了一种基于虚拟仪器的测量数据与图像传输系统,该系统采用DataSocket技术,实现了数据和图像的实时发布,分析了DataSocket技术构成,为网络测控技术应用提供了解决思路。实践表明,DataSocket技术不需要复杂的TCP底层编程,能够实现各种资源最有效合理的配置,应用前景非常广阔。     

基于DataSocket技术的LabVIEW远程测控

DataSocket技术基于TCP/IP协议并对其进行高度封装,能在测试测量过程中实现服务器与多用户的实时数据交换与共享,而用户不必关心程序底层的细节。本文分析DataSocket的内部组成及利用URL进行资源定位的方式,详细讨论基于DataSocket的LabVIEW远程测控方法。通过局域网开发的典型应用实现网络测控数据的实时发布与读取。随着测控系统的网络化,其应用前景将越来越广阔。     

基于虚拟仪器的远程测控技术研究

分析了虚拟仪器技术系统的构成,并对虚拟仪器远程测控技术中的基于DataSocket技术的远程测控和基于NetDDE技术的数据通信技术进行了介绍。     

虚拟仪器远程测控技术的三种实现方法

讨论了远程测控技术的三种方法：基于NetDDE技术的数据通信；基于DataSocket技术的远程测控；基于ActiveX技术的远程测控。实现了LabVIEW程序之间的实时数据通信和实时控制。比较了它们的优缺点和实现方法。     

基于虚拟仪器的网络化测控系统

介绍基于虚拟仪器的网络化测控系统的平台模型及网络通信技术--DataSocket,以及在LABVIEW下,利用DataSocket控件实现的C/S模式和B/S模式下网络通信软件.     

基于PXI总线的远程测控系统设计

介绍了一套基于虚拟仪器的远程测控系统，系统以多功能转子实验台作为被测对象，通过PXI采集平台和DataSocket技术实现数据的采集和远程通讯。整个系统柔性好，适应性强，不但可以用于实验室教学，还可以更广泛地应用到工业现场。     

基于虚拟仪器的砂带磨削参数远程网络化测控系统

将虚拟仪器的网络化测控系统用于砂带磨削参数测量和控制,它将实时采集的磨削参数,经PXI系统控制器显示、分析、处理.在LabVIEW系统平台的Web服务器和DataSocket服务器支持下,将数据发布到以太网或Internet网上,并能实现远程控制功能.     

DataSocket技术及其在远程测控中的应用

讨论基于Web的虚拟仪器和DataSocket技术,以及利用NI DataSocket ActiveX控件和DS服务器实现多台虚拟仪器数据共享与远程控制的方法,并结合作者的测试系统项目进行了分析。     

电子商务环境下测试诊断服务系统的研究

将电子商务技术引入到远程测试诊断领域,提出了在电子商务平台上完成远程测试与故障诊断的解决方案。建立了一套面向客户的技术服务、信息服务的电子商务体系,实现了信息网络、金融网络、测控网络三网合一。系统地阐述并实现了测试诊断服务电子商务的体系结构、系统安全性以及在线远程测试服务、神经网络诊断服务等子系统的功能,重点对DataSocket远程数据传输、远程信号处理、神经网络的学习与诊断等关键技术进行了研究和探讨。     

基于LabVIEW的远程数据采集系统开发

介绍了LabVIEW 7 Express开发环境下远程数据采集的实现方式及采用DataSocket技术实现的优势。文中以PCI-6221DAQ卡为例，开发了基于DataSocket技术的远程数据采集系统，并对系统硬件和软件的设计做了详细阐述。实现过程充分说明IabVIEW 7 Express在实现远程数据采集方面方便、快捷、实用等诸多优越性。     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.