基于LPC2148微处理器的USB数据传输的实现

专用USB芯片能够实现具有特定功能的嵌入式系统与主机进行数据传输,但可能会导致增加成本.现今,以ARM为内核的微处理器不仅集成了USB功能,还具有诸多其他强大的功能,使开发者在设计自己的系统时更灵活、省事.LPC2148具有2K终端USBRAM,512K片内Flash,是适用的USB开发芯片.利用LPC2148微处理器USB器件模块的软件接口与USB协议层软件之间的联系,实现LPC2148处理器USB器件与主机之间的通信,完成数据的传输.     

基于ARM微处理器的嵌入式TCP/IP协议的实现与应用

本文介绍了嵌入式系统的基本概念,讨论了嵌入式系统实现网络化的一种新思路-通过简化通讯协议来实现嵌入式系统与网络的互联,以ARM微处理器为平台实现了一套完整的嵌入式TCP/IP协议栈,最后介绍了该协议栈在工业以太网控制过程中的应用方法及原理性系统图.     

一种基于ARM的嵌入式电能质量监测系统

本文介绍了一种基于ARM技术的嵌入式电能质量监测系统,其控制处理模块使用具有ARM7TDMI核的LPC2214处理器,操作系统选用针对工业控制领域的嵌入式μLinux,实时监测和录制电压和电流数据,通过嵌入式GUI开发实现电能质量指标的动态显示。     

基于LPC2292的Ethemet-CAN转换器的设计与实现

为了解决以太网和CAN总线之间的互联问题,将煤矿井下现场总线控制系统改造为以太网络分布式控制系统,研发了基于LPC2292微处理器和RTL8019AS以太网控制器的Ethernet-CAN转换器.LPC2292采用嵌入式TCP/IP协议栈通过RTL8019AS与以太网中的设备进行通信,利用LPC2292集成的CAN控制器与CAN总线上的终端进行通信.在通信过程中,LPC2292进行TCP/IP协议和CAN协议之间的转换.经验证,该转换器很好地完成了两种网络之间的协议转换和数据通信.     

基于ARM和Linux的嵌入式Web Server设计与实现

介绍了嵌入式ARM处理器的特点和硬件平台的设计、嵌入式操作系统的设计,构建了基于嵌入式Web Server的远程监测系统结构,重点分析了嵌入式TCP／IP协议栈的体系结构、嵌入式Web服务器BOA中一些重要文件的配置、实现动态Web服务的CGI技术及动态WEB服务器的移植,实现了基于B／S结构的嵌入式动态Web远程监测系统。     

多传感器集成水质检测系统的设计

设计一套水质检测系统,应用电源管理策略使其能可靠、节能地工作于无人监管的野外.系统采用飞利浦ARM7的LPC2148作为处理器,通过LPC2148内部集成的RTC对数据采集时间进行控制,把各传感器采集到的数据进行融合,一方面使用外部扩展存储器SD卡对融合后的数据进行及时存储,另一方面,把融合后的数据通过DES加密算法加...     

基于ARM的水文测量报警系统

介绍了一种基于ARM的水文测量报警系统的设计.该系统以LPC2148微处理器为控制核心,基于超声波测距原理测量系统距水面的距离;使用变频雷达传感器测量水面流速.在软件设计中使用滤波法、中值法提高超声波测距精度;编程设计控制雷达波发射频率精确的测量水面流速.系统使用LCD显示测量结果、报警值和报警状态;使用RS-232串口和嵌入式无线数据传输模块通信和数据传输;通过按键扫描调整水面距报警值,实现了系统液面距的声光报警.     

基于FPGA的嵌入式以太网通信

提出了一种基于FPGA和DM9000A的嵌入式以太网通信的设计方法,阐述了硬件部分的电路组成和MicroBlaze软核处理器的一些片内外设IP核,以及简化的TCP/IP协议栈的实现方法.软件采用Standalone的运行方式,软件代码直接运行在裸CPU核上.与嵌入式操作系统相比,节约了系统资源,提高了运行速度.     

基于LPC2292的Ethernet—CAN转换器的设计与实现

为了解决以太网和CAN总线之间的互联问题,将煤矿井下现场总线控制系统改造为以太网络分布式控制系统,研发了基于LPC2292微处理器和R．TL8019AS以太网控制器的Ethemet—CAN转换器。LPC2292采用嵌入式TCP／IP协议栈通过RTL8019AS与以太网中的设备进行通信,利用LPC2292集成的CAN控制器与CAN总线上的终端进行通信。在通信过程中,LPC2292进行TCP／IP协议和CAN协议之间的转换。经验证,该转换器很好地完成了两种网络之间的协议转换和数据通信。     

基于Zigbee的配电网状态监测子站

针对传统配电网状态监测子站普遍存在的布线工程大、难扩展、成本高等问题,研发了基于Zigbee的配电网状态监测子站:设计了基于ARM嵌入式处理器和CC2530的硬件平台,并实现了Zigbee协议栈在CC2530的移植。该系统具有低成本、高可靠的优点,拥有良好的应用前景。     

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...     

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。     

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。     

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.     

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。     

基于多目标非支配解提取法的电力系统无功优化

针对传统的电力系统多目标粒子群优化算法采用权重系数法将多目标转化为单目标,从而忽视了各目标函数间的竞争关系这一问题,提出将非支配解提取法运用到电力系统多目标无功优化中,并设定了一套提取规则,以电力系统中的有功网损、电压偏差和电压稳定裕度为目标,使目标在充分竞争的情况下得出Pareto最优解,利用IEEE-14节点系统对多目标非支配解提取法的电力系统无功优化进行了仿真测试。研究结果表明,该算法一次运行可以得出多组非支配解,既有偏向单个目标的解也有兼顾所有目标的解,克服了权重系数法的盲目性和单一性,可使电力决策者根据实际问题选择最优解,具有较好的灵活性与多样性。     

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.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.