基于VxBus的高速数据采集卡驱动程序开发

介绍了嵌入式操作系统VxWorks 6最新设备驱动模式VxBus的原理,分析了在该驱动模式下数据采集卡ADT650的驱动程序开发过程,ADT650数据采集卡是基于PC104总线的扩展板。通过PC104总线可将其与PC104嵌入式系统构成一个高性能的数据采集与控制系统,适用于结构紧凑,高可靠地嵌入式应用。设计并实现了数字量、模拟量信号采集的驱动程序和应用编程接口。在VxWorks嵌入式系统下实现了ADT650高速数据采集卡的驱动程序,对系统的扩展应用带来了极大方便。     

基于PC/104的嵌入式四轴运动控制卡硬件设计

针对基于PC/104的嵌入式四轴运动控制卡,结合DSP专业工控芯片设计电路原理图和PCB。该设计采用PC/104嵌入式系统总线,以MCX314As芯片进行运动控制,适用于工业领域的四轴运动控制。使用Altium Designer软件进行电路原理图绘制和PCB设计,该卡设计旨在实现电火花线切割机床的运动控制。结合嵌入式CAD编程系统,搭建了嵌入式电火花线切割数控加工系统。     

基于IPv4/IPv6双栈嵌入式Web传感器网络接口设计

本文提出了一种基于微控制器的服务器的设计理念,实现了基于IPv4/IPv6的嵌入式Web传感器.重点论述了基于双栈的嵌入式Web传感器网络接口的设计,并分析了HTTP有限状态机和Web服务器功能的实现.     

基于PC/104海洋监测系统的ISP设计

本文根据PC/104在海洋监测系统应用中出现的问题,提出了基于PC/104系统的ISP(在系统编程)的方法.并从主机、从机两个方面分别给出了实现该方法的思路、流程以及一些需要注意的问题.该方法的应用有效提高了基于PC/104的嵌入式系统程序调试的效率,降低了已安装系统程序升级的复杂度.     

嵌入式网络化智能节点设计与实现

针对当前网络化智能节点的高性能要求,采用基于ARM处理器和实时操作系统VxWorks的开发模式进行设计;搭建了智能节点硬件平台,引入了嵌入式Web服务器GoAhead,实现了软件平台功能,并对智能节点设计中的关键技术进行了实现;最后给出了不同开发模式的性能特点比较.     

嵌入式实时linux在PC104平台上的实现

本文简要介绍了嵌入式Linux的几种开发方法。然后结合PC104卡的主要特征,对构建过程中交叉开发环境构建、内核定制、根文件系统建立、实时性实现以及嵌入式系统在PC104主板上的移植等方面作了详细阐述。论文最后利用RTAI,实现了一个基于PC104主板的可以从CF卡启动的嵌入式实时Linux系统。     

基于PC104总线和CPLD的D/A系统的设计与实现

提出一种基于PC104总线和CPLD实现D/A系统的设计方法,设计并完成了硬件电路.同时给出了D/A系统中部分硬件的设计要点.该系统具有可靠性高、体积小、抗震性好的优点,适合于嵌入式系统中的D/A输出.     

基于CAN总线和嵌入式WEB的监控系统

文中提出了一种基于CAN-Ethernet的远程监控系统,实现了CAN总线与以太网的互连.系统以ARM7芯片LPC2292为核心,在μC/OS-Ⅱ操作系统下移植了一个经过裁剪的适合嵌入式系统应用TCP/IP协议栈,并实现了嵌入式Web服务器,以此网关作为CAN总线主节点与总线交换数据.管理人员通过IE浏览器访问此Web服务器,能够在Web页面上动态显示保存在网关中的智能仪表检测的实时数据.实际运行效果表明:系统运行准确可靠,具有良好的应用前景.     

嵌入式Linux下PC/104数据采集模块驱动实现

为扩展PC/104嵌入式系统的应用环境,开发了Linux环境下PC/104数据采集模块DIAMOND-MM-32-AT的驱动程序。首先,分析了数据采集模块DIAMOND-MM-32-AT的工作模式。然后,在自构建嵌入式Linux系统环境下,按照Linux驱动程序规范,实现了PC/104数据采集模块的驱动程序。最后,开发了远程数据采集系统,包括服务器端程序和客户端程序。通过实验表明:所设计的数据采集驱动程序是正确的,而且具有高可靠性。     

基于嵌入式Linux多传感器融合的移动机器人避障系统

系统采用超声波传感器结合视觉传感器,基于模糊PID控制的多传感器信息融合算法。构建了ARM+Linux嵌入式开发环境来进行图像压缩和处理并实现基于B/S网络的远程监控功能;移植了USB摄像头和无线网卡的驱动,配合Video4Linux接口实现图像采集,并利用jpeglib静态库对图像进行了压缩处理。利用嵌入式Web服务器Boa并配合Mini GUI程序,实现了远程监控和图像动态更新。试验表明,该系统可以实现在Linux下融合多传感器信息、完成避障算法并实现路径规划和远程控制,具有较高的可靠性和实用性。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

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.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

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.