基于虚拟仪器的发动机ECU信息读取技术

设计研究汽车OBD-Ⅱ模块的接口协议,采用带有OBD总线（诊断协议接口）与USB或RS232串口的TL718通讯模块和带有USB或RS232串口的计算机,对OBD-Ⅱ模块信息进行数据采集和存储,并以图形形式实时显示在计算机上。该监测程序采用虚拟仪器软件LabVIEW实现,具有数据存储,回放等功能。     

TL16C754在嵌入式系统串行通信中的应用

TL16C754是带自动流控制的通用异步收发器,可以工作在FIFO模式,通过接收和发送寄存器的缓冲,来减少CPU的软件开销以提高系统的效率。拨码开关可以简便地实现RS232和RS485/422串口标准切换。本文以在嵌入式模块586-Engine的实现为例,介绍了利用TL16C754和拨码开关进行方便切换的RS232和RS485/422串口设计的硬件设计以及使用C语言编写的方便移植的驱动软件。     

数控机床网络接口模块的设计与实现

为了对没有网络接口的老式数控机床实现网络化管理,采用STC15L2K40S2高速单片机和ENC28J60以太网控制器设计出了一款高性价比的数控机床网络接口模块。该模块利用数控机床的RS232串口扩展到以太网网络,在ENC28J60上实现了u IP协议栈,可以实现自动分配IP地址和屏蔽数控机床具体通讯细节,使用方便、操作简单,投入使用获得了较好的效果。     

CAN总线通讯技术在岸桥升降机中的应用

文中从网络构成、硬件和软件3个方面详细介绍了CAN总线通讯技术在岸桥升降机中的应用.方案采用了RS232网络与CAN总线网络组合,设计了带有CAN通讯功能的呼梯盒以及具有RS232和CAN通讯数据交换功能的通讯转换模块,对其硬件设计和软件流程进行了介绍.经过实际验证,该方案有效提高了升降机运行的可靠性,降低了成本,提高了生产效率,使产品更富市场竞争优势.     

升降机控制器专用通讯与数据处理模块的设计

为了满足升降机综合数据信息管理系统的数据采集以及设备智能化改造的要求,设计了一种具有多种网络接口的专用通讯与数据处理模块。该模块采用AVRXMEGA系列单片机,具有RS232、RS485、CAN、以太网接口,可以通过电脑现场配置通讯端口的通讯格式与协议,因此可以适应不同的应用环境。模块内的数据处理单元具有数据的格式转换功能以满足不同的通讯协议。该模块的应用,为升降机信息化的实现提供了必要的硬件保障,有助于设备技术水平和管理水平的提高。     

颗粒计数仪的网络化数据采集

随着以太网技术的发展,为实现分析数据的自动采集传输,油液监测设备通过串口接入网络的要求日益提高。以颗粒计数仪为例,就如何利用MOXA公司的Moxa Nport系列RS232与TCP/IP协议转换模块使数字颗粒计数仪接入以太网进行讨论。     

Mine-used multi-function serial signal converter based on Ethernet

介绍了一种以STM32互连型系列微控制器STM32F107VCT6为核心的矿用多功能以太网串口信号转换器。该转换器移植了μC/OS-II嵌入式操作系统,并嵌入了LwIP协议栈,通过软硬件的设计实现了以太网信号与M-Bus信号、RS485信号与RS232信号的相互转换,使煤矿井下各种监控设备接口之间的互联更加便捷。该转换器有效解决了各种监控系统和通信系统之间的兼容性问题,提高了安全监控系统的整体性能,具有很好的应用价值,值得在煤矿安全生产中推广使用。     

基于IEC 61850的多功能电能表

基于IEC61850的数字化电能表的设计包括硬件电路设计和软件算法设计.硬件主要由信号处理电路和光纤以太网接口电路组成.信号处理电路是利用TMS320F2812组成信号处理中心,完成大量的电能参量算法运算;合并单元和电能表之间通过光纤通信,光纤以太网接口电路包括光电转换器、以太网媒介转换器和以太网控制器三个电路模块构成.软件由各功能模块按照流程图的模型给出.     

基于ARM处理器的矿井供电监控分站设计应用

针对煤矿供电系统信息共享不完善,监控分站智能化程度不高的情况,提出一种智能监控分站方案,并阐述了分站所实现的功能.以嵌入式处理器为核心设计井下供电监控分站,并对主控模块进行选型,设计了分站的存储模块与RS485通信模块,在软件方面提出系统的抗干扰措施,并通过调试实验,验证了分站的抗干扰能力.分站之间以RS485串口通信组网,利用以太网与上位机通讯,提高了各设备之间信息共享的及时性,同时加快了系统处理故障的速度.     

基于STM32的CAN总线/RS232接口转换器的设计

RS232接口和CAN总线等通信技术得到广泛的应用,但是各有优缺点。RS232的接口容易受损,而在一般上位机上并没有CAN总线的接口。所以本设计主要提出了基于STM32的CAN总线/RS232接口的转换器的设计,以SN65HVD230芯片为CAN总线收发器,MAX3232实现RS232的电平转换。     

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.