基于PLG应用技术的电气控制分析研究

可编程序逻辑控制器(PLC)是综合了计算机技术、自动控制技术和通信技术的一种工业应用的计算机.通过编制软件来改变控制过程,是微机技术与常规的继电接触器控制技术的有机结合.它为工业自动化提供高可靠性的自动化控制装置,已经成为继电接触器控制系统更新换代的主导产品.     

电机正反转的继电-接触控制系统改造成基于PLC的控制系统

继电-接触式控制系统因其控制线路复杂,安装工作量大,改变控制功能和维修困难等原因,正逐渐被功能强大,可靠性高,简单易学,操作方便的PLC所替代.本文给出了电机正反转的继电—接触控制系统改造成基于PLC的控制系统的设计方案。     

PLC在镗床控制系统中的应用

针对传统继电-接触控制的镗床存在电路复杂、可靠性差、故障诊断与排除困难等缺点，提出了用可编程控制器对镗床控制系统进行改造。介绍了0MRON公司CPM1A系列可编程控制器在镗床控制系统中的应用，给出了可编程控制器改造T68镗床电气控制系统的硬件组成和软件设计，其中包括可编程控制器的机型选择、输入/输出地址分配、输入／输出端接线图及可编程控制器梯形图程序设计。详细地分析了用可编程控制器控制镗床的工作过程。说明了可编程控制器控制取代传统继电-接触控制的方法，使得镗床的可靠性和效率大为提高，在工业上有广泛的应用前景。     

用于红外跟踪的继电型控制系统的设计

本文以继电型控制系统的一般原理为基础,分析了继电型控制系统作为随动系统(尤其是红外导引系统)的性能。文中用继电型系统特性J (ω)分析了本继电系统,其突出的优点是不用电子计算机即可在很短的时间内看到明晰的结果。本文还给出了继电控制系统用于跟踪系统的参数设计原则和例子。     

浅谈煤矿提升机的自动化控制

煤炭工业是我国国民经济建设中的重要工业。煤矿提升机作为煤矿生产的重要设备,肩负着煤矿生产的安全使命。但是,我国还有一些煤矿企业仍然在采用传统的继电接触器控制系统来控制三相异步电动机,无法满足当前形势下的煤矿生产需求及安全生产标准。PLC作为现代工业自动化控制的主要手段,有着十分广泛的应用。本文首先介绍了煤矿提升机系统的组成,PLC的相关知识,重点论述了PLC在煤矿提升机自动化控制系统中的应用。     

基于无线语音识别的电动车充电控制系统研究

我国现阶段电动车保有量超3亿辆,由电动车充电引发的火灾事故时有发生,为解决居民用户电动车过度充电问题,设计了一种电动车无线语音充电控制系统。该系统主要采用SPCE061A凌阳单片机、nRF24L01无线射频收发模块和STC89C52单片机。通过对凌阳单片机输入语音命令,并由无线射频收发模块将命令发送到STC89C52单片机以控制继电器,从而实现用户通过远程无线语音对电动车充电的控制。     

PLC在常减压炉吹灰中的应用

应用日本OMRON公司C60P可编程序控制器对常减压吹灰器原有继电控制系统进行了技术改造,取得了良好的效果。本文将对PLC控制原理及方法做一介绍。     

基于CAN总线的电动车控制系统设计

针对电动汽车具有良好的能源和环保等性能.提出一种基于CAN总线的电动车控制系统设计方案,该控制系统能提高电动车控制系统间的通信可靠性.实现电池管理系统、电机控制器、充电机和整车控制器的实时通信和集中管理.使电动车运行更加实时和稳定.详细论迷了系统的总体结构、CAN通信协议协议的制定、节点硬件电路设计及软件设计.经过实验,各节点间通信实时可靠,验证了电动车控制系统的可靠性和正确性.     

DSP在平行双轮电动车控制系统中的应用

通过对平行双轮电动车结构的阐述,介绍了控制系统的构成和工作原理,以及对无刷电动机的控制,并对系统的软件设计做了介绍.在平行双轮电动车控制系统中采用DSP芯片进行开发设计,不仅可以完成电动机驱动及保护的功能,而且大大提高了处理数据的效率,使驱动性能更加稳定.     

基于树莓派和YOLOv3电梯内电动车检测系统设计

针对电动车进入电梯上楼存在安全隐患问题,提出了基于YOLOv3电动车检测算法,并基于树莓派开发和实现了一套对电梯内的电动车在线实时检测系统.首先将检测到包含电动车的异常数据实时反馈给电梯控制系统,以便对电梯进行制动控制;同时将数据上传到云平台,供客户在管理系统上实时查看和紧急处理.通过测试,开发的系统对电梯内电动车检测...     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

A rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks