基于USB的实时圆度检测系统的研究及开发

本文采用CY7C68013A芯片作为圆度数据采集主芯片,保证数据采集的实时性,以USB接口实现采集数据到PC机的数据传送,用PC机进行数据处理和显示.系统具有体积小,精度高,实时性好,操作使用简单的特点,已成功应用于YD-200D圆度仪.     

基于USB接口的DSP数据采集卡

基于DSP芯片和USB总线技术,设计了多通道数据采集处理系统.该系统可实现热插拔,扩展方便,特别适合便携式计算机.既满足实时性,又满足易扩展性,有一定的实用价值.     

一种基于Neuron芯片的远程数据采集装置的设计

文章介绍了Echelon公司的Lonworks技术和Neuron芯片以及MAXIM公司的MAX186数据采集芯片。根据Neuron芯片的特性和Lonworks技术的特点，设计出了一种实时性强、可靠准确的远程数据采集装置。     

基于DSP芯片的生化检测系统设计与应用

介绍以DSP芯片为核心的生化检测系统的系统结构,包括光路设计,高速数据采集模块,控制波长转换和托盘运行的电机控制模块,以及和上位机进行串行通信的SCI接口.通过TI公司的TMS320LF2407A DSP芯片,对各个模块协调控制,达到系统的精度要求和实时性要求.     

基于ARM/VxWorks的新型机载数据采集系统设计

为满足航空测试环境下对测试设备的智能化、小型化、低功耗以及实时性等要求,提出一种基于VxWorks的机载航空数据采集设备图形化系统的设计方案,实现对机载设备的数据采集、数据存储和采集结果图形化显示.方案采用基于ARM9内核的嵌入式处理器、AD9430数模转换芯片、TFT触摸显示屏以及大容量数据存储器为关键部件,设计出数据采集设备的硬件结构;在此基础上通过移植VxWorks操作系统、开发设备驱动程序与图像控制显示应用程序,实现了对机载数据采集设备的图像化设计.经测试本系统满足机载航空测试设备的技术要求.     

基于PC/104总线和CPLD的多通道实时数据采集系统

提出基于CPLD的多通道实时数据采集的设计方案.详细讲述数据采集模块部分硬件设计要点,提供了系统的软件设计流程.该系统具有性能稳定可靠、实时性强、体积小和抗震性好等优点.     

基于GPIF模式USB芯片的温度采集系统

介绍了EZ-USB系列芯片特有的GPIF接口模式在温度数据采集中的设计应用,彻底打破了芯片内部CPU对USB传输速率的瓶颈,同时避免了使用其它微处理器的硬件开支.最后以CY68013A芯片数据采集卡为例阐述了GPIF模式的硬件组成和软件设计.     

便携式数据采集系统

针对目前插卡式数据采集卡拆卸不方便,体积较大以及传统单片机控制采集速度低、非实时等一系列缺陷,设计了一套基于FPGA与USB2.0的便携式数据采集系统.系统采用FPGA作为主控芯片,实现对A/D转换芯片及USB2.0接口芯片的控制.利用VC++设计数据采集系统的控制界面,对采集的数据进行显示和存储.该系统小巧、便携的设计特别适用于移动的作业现场.     

基于μC/OS-Ⅱ的材料试验机数据采集系统

在复杂的实时系统中,采用传统的前后台单任务控制机制已经不能满足要求.本文将嵌入式操作系统μC/OS-Ⅱ移植到ARM7处理器上,应用于电子材料试验机的下位机软件设计,数据采集部分采用24位的CS5532A/D转换芯片,多任务之间通过消息队列来进行数据传递,提高了系统的实时性,稳定性和抗干扰能力.     

基于STM32F103VCT6的振弦式传感器数据采集系统

针对隧道、矿山、桥梁、水库大坝等工程中传统振弦式传感器采集系统精度不高、相互之间通信困难、实时性差等缺点,设计了以STM32F103VCT6为核心控制芯片的振弦式传感器数据采集系统。该系统将振弦式传感器数据采集、数据存储、电源管理集于一体,并可以连接不同传感器。数据采集测量系统提供GPRS、RS485等多种通信接口,利用无线通信模块可以方便地实现多台测量仪器之间自动组建无线网络并建立动态路由,实现恶劣环境下的数据采集和传输。     

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.