基于模型设计方法的混合磁悬浮平台的控制设计及实现

基于模型的设计方法,利用Matlab/Simulink对磁悬浮系统进行浮点数字PID控制仿真,并结合定点控制器DSP2812,实现系统控制的快速构建,达到系统模型及控制设计、系统仿真和硬件实现的无缝集成,从而加速控制系统的快速开发.首先,在Matlab/Simulink环境中建立系统控制模型,并利用其自带的定点工具箱对数字控制器进行定点化处理,建立可以移植的带有数字平均滤波的Simulink代码模型.再通过RTDX功能进行算法的调试与验证,并进行代码模型的优化.最终自动生成可靠的C代码到控制器来实现对混合磁悬浮平台的控制,实现在模型仿真和系统实施的集成和统一.并由实物进行了验证．     

一种三维图像处理系统的FPGA与DSP实现

三维图像信息处理系统在传真、远程加工、快速成型等方面有着重要的实际意义,基于FPGA与DSP的实时三雏图像处理系统利用xilinx公司的FPGA芯片和ADI公司的高速DSP处理芯片构建了三维图像处理硬件系统,借助DSP的高速运算性能和优化的DSP代码,实现了系统的软件设计。基于FPGA与DSP的实时三维图像处理系统为三维图像的处理提供了一种更加实用的解决方案。     

PLC总线和DSP芯片的图像处理平台的硬件设计

数字信号处理和模拟是一门涉及许多学科而又广泛应用于许多领域的新兴学科。20世纪60年代以来，随着计算机和信息技术的飞速发展，对数字信号的处理和模拟要求也在不断提高。DSP功能、外设丰富，速度快，主要应用于电器，电子类产品的自动控制。PLC则不需要编写底层代码，它更方便用于依靠梯形图实现逻辑控制，与DSP相比，它更像个半成品。二者各有特点、互为补充，二者的结合对于数字信号的处理和模拟具有重要意义。本文分别对PLC和DSP一一介绍，并探讨探讨二者在硬件设计上集成应用。     

多通道噪声和振动测试分析系统

设计了一个利用DSP系统、USB接口和笔记本电脑,实现对机械噪声和振动进行多通道数据采集与分析处理的系统,克服了常用的单一信号分析的不足.通过设计DSP信号测试分析软件,实现了实时机械状态监测与故障诊断,使用十分方便.     

基于MATLAB的目标跟踪实时仿真库的设计与实现

利用 MATLAB/SIMUNKK 的代码产生原理,针对以 c6201 DSP 为核心的图像处理平台,开发目标跟踪实时仿真库,建立了目标跟踪实时仿真系统。在此环境下可将算法模型快速生成 DSP可执行程序,并可直接运行。此环境为算法研究者建立了算法到 DSP 程序开发的桥梁,使算法快速得到实时验证,大大节省 DSP 程序移植的时间。     

基于DSP的电动汽车CAN总线通讯技术设计

根据电动汽车(EV)通讯高实时性、高可靠性的要求,设计了一种基于TMS320LF2407型DSP的CAN总线通讯技术方案,利用DSP内嵌的CAN总线模块实现电动汽车内的实时通讯.文中介绍了CAN总线物理层硬件接口和控制器的软件实现.     

一种基于DSP实现的直流输电系统控制方法

直流输电技术在大型电网中的应用已日趋成熟,并逐渐被引入船舶电力系统等领域,关于高压直流输电的控制一直是研究热点。利用目前广泛使用的数字信号处理器(DSP)作为直流输电的控制核心单元,研究了高压直流输电系统的基本组成和配置,完成了相关硬件电路和软件电路的设计;然后提出了设计数字滤波器直接生成C代码的MATLAB和CCS的联合开发方法;接着介绍了直流输电的控制结构及具体控制方式;最后介绍了DSP控制系统与上位机通信的软硬件。仿真和试验结果验证了该控制方法的有效性。     

油田抽油机传动系统控制原理与设计

针对系统控制自动化需求以及节能降耗的要求,提出一种基于DSP的智能传动控制系统。为实现对该系统的设计,首先对目前主流的抽油机类型进行了简单的介绍,然后对传动系统调速的原理进行了分析,最后结合DSP在智能控制方面的优势,利用DSP芯片作为主处理器,从硬件和软件的角度对系统进行了设计。由此通过设计,为抽油机的节能和自动化控制提供了参考。     

基于FPGA和DSP音频接口模块的设计与实现

介绍了一种基于FPGA和DSP的新型音频接口模块设计方法。特别是如何具体实现DSP、FPGA与TLV320AIC23B之间的无缝连接,并给出了软硬件应用设计实例。     

基于FPGA的多DSP系统接口电路设计

针对多DSP(数字信号处理器)的数据传输有三种常用接口方式:EMIF,HPI和IdcBSP方式.而采用EMIF接口方式,利用FPCA(现场可编程逻辑门阵列)设计FIFO的接口电路,将各个DSP的EMIF总线接人FPGA中,可实现多块DSP之间的连接.实验结果表明,这种方式无需外加逻辑器件即可实现高速传送数据通用于数据块的传送.这种设计已应用于由4片DSP构成的信号处理系统中.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.