双电源智能自动切换系统的研究

针对不间断供电的需求,基于采样、比较的工作原理,利用微控制器实现对电源状况的判断并进行相应的控制,提出了一种双电源供电自动切换系统的智能优化解决方案。系统允许用户按配电网和负载情况进行不同设定,根据不同的故障情况完成主、备电源间转换,以保持供电的连续。     

高压双电源智能控制系统的研究

不间断供电在工业和民用方面都具有广泛的需求.为此研制了一套智能控制装置控制双电源供电系统,利用ARM对电源状态进行判断并进行相应的控制,实现了主备电源的自动切换.     

煤矿瓦斯监测设备电源自动切换装置的研制与应用

根据煤矿井下电源环境研制开发了双电源自动切换装置,保证监测分站连续不间断工作,能自动检测两路接入电源的供电状态,并根据检测结果确定电源输出。也可通过手持遥控器切断或接通电源输出,便于检修维护其输出端设备。     

基于单片机的双电源切换装置的设计与实现

针对不间断供电的广泛需求,基于对电压采样、检测和比较的工作原理,利用单片机对电源状况进行检测和判断并进行相应的控制,实现了双电源供电的自动切换。该电源切换装置具有反应灵敏、工作可靠、功能齐全、声光指示等特点,并对切换后的开关进行检测,以确定是否正常分闸或正常合闸,形成闭环控制回路,以免开关本身的故障造成系统不正常工作。从硬件结构、软件编制和抗干扰措施3方面进行了较详细的讨论。     

基于ARM的井下不间断电源的设计与实现

提出了以STM32F100为微处理器的井下矿用不间断电源的设计方案,设计了单端反激式供电电源和自动切换电路,制定了以CN3705芯片和FS361A芯片为核心的电源管理系统,采用了多种保护措施,给出了系统程序软件流程图。实验测试表明,系统工作稳定,在掉电时,可以实现自动切换。     

井下通信及监控系统交流稳压供电装置研究

针对赵庄矿井下通信及监控系统电源供电不稳定给系统运行带来的隐患,计划研制出一款双回路接入、可自动切换的稳压电源,用来给井下通信及监控系统供电,从而在供电条件上消除隐患,保证系统稳定运行。     

基于ARM和DS18B20的数字测温系统

根据通信基站电源供电要求,采用AT89C52单片机对10GF1-4风冷柴油发电机进行自动改造,实现小功率柴油发电机智能化自动控制.系统功能包括：市电/油电的自动切换,供电电源电压、电流、频率的自动监控,柴油机缸温、油压自动监测等.     

基于AT89C52的小功率柴油发电机自动控制改造

根据通信基站电源供电要求,采用AT89C52单片机对10GF1-4风冷柴油发电机进行自动改造,实现小功率柴油发电机智能化自动控制.系统功能包括:市电/油电的自动切换,供电电源电压、电流、频率的自动监控,柴油机缸温、油压自动监测等.     

380V系统控制电源及FUR组合保护应用及优越性

发电厂内的厂用电系统一般都为双电源供电系统,在双电源间装设自动切换装置,可以缩短停电时间,以保证供电的连续性,为保证自动切换装置可靠动作,合理的设置控制电源,是保证自动切换成功的重要因素。下面说一说电力系统中0．38KV系统控制电源的控制方式选择及FUR组合保护应用。     

交流电源系统安全运行管理探讨

根据电网调度自动化、电力通信电源的保障策略要求，对交流不间断电源系统（UPS）接线作部分改进。用STS静态切换开关代替联络开关，实现UPS在两段母线间自动切换的功能，减少手动操作步骤，确保电源系统的安全运行，提高可靠性。     

用体视显微镜改制体视摄影器

详细地介绍了XSD型体视显微镜改制体视摄影器的方法与效果。并提出摄影接筒的长度可为30～225mm,其变化对摄影器总的放大倍数没有影响。     

Formation of a flange from a flat blank with a hole

A model of axisymmetric formation of a flange from a flat blank with a hole by expanding by a hard punch with a fixed flat flange is given, taking into consideration contact friction, change of wall thickness, strengthening of material, and the tool bending radius. Elastic, elastic-plastic and hard-plastic process stages are studied.     

变遗憾为精彩

从我做杂志起,我就知道自己选择了一个创造遗憾的职业,一个需要不停地变遗憾为精彩的职业。 每期杂志的出版都使我惴惴不安,在反思杂志的不足与期盼您评判到来中度过,在深入的思考与尖锐的批评中杂志不断汲取了营养,     

Collision between a ring and a beam

With car–parapet collision accidents in mind, a normal collision between a free-flying half ring and a simply supported beam with/without axial constraints is studied, in which an elastic–plastic half ring with an attached mass and the elastic–plastic beam are taken as the simplest models of a car and a parapet, respectively. Particular attention is paid to the energy partitioning between the two structures and the evolution of the contact regions during collision. A mass–spring finite difference (MS–FD) model is employed whilst the large deflection and axial stretching/compression are incorporated. The numerical results show that the less stiff (i.e. softer) structure will dissipate more energy and the contact regions will move away from the initial contact points. With the increase of the relative thickness of the beam to the ring, the final deformation of the half ring will transform from a “U” shape to a “W” shape.     

高效镜面抛光技术

一次加工就可将刀槽表面抛光到镜面质量。DIAMETAL公司最新开发的MNT-MS金刚石砂轮以其卓越的加工能力而备受关注。他们甚至还可以一次就加工完成深度达若干毫米的刀槽。     

集散控制系统在啤酒厂糖化车间的应用

本文简介了工控组态软件 T350 0、欧陆下位机的特点 ,给出了一个在啤酒厂糖化车间应用的实例。     

Estimation of a Bottom Echo-Signal Level Reflected from a Plane Surface of a Cylindrical Article Using a Normal Probe Operating in a Pulsed Mode

The influence of the pulsed operating mode on a bottom echo-signal level reflected from a plane surface of a cylindrical article is studied during variations in the article's radius. It is shown that the pulsed character of a signal smoothens this function significantly as compared to that in the previously computed continuous mode. Numerical estimates of the bottom echo signal have been made for the ultrasonic inspection of wheel-pair axles of railway vehicles.     

八关节三动杆蛇形机器人的运动模拟

蛇形机器人是一种高冗余度的机器人,由于其结构可变形,能够通过松软地面以及跨越(或避开)障碍物,能代替人完成某些危险场所如核电厂等维修及城市搜救.本文提出了一种类正弦波形的八关节三动杆蛇形机器人结构,做了运动模拟并给出了结论,该蛇形机器人的研制成功为设计相关类型的机器人提供了参考.     

Swing-attenuation for a quadrotor transporting a cable-suspended payload

This paper presents the problem of safe and fast transportation of packages by an Unmanned Aerial Vehicle (UAV) kind quadrotor. A mathematical model and a control strategy for a special class of underactuated mechanical systems, composed of a quadrotor transporting a cable-suspended payload, are proposed. The Euler-Lagrange formulation is used to obtain the dynamic model of the system, where the integrated dynamics of the quadrotor, cable and payload are considered. An Interconnection and Damping Assignment-Passivity Based Control (IDA-PBC) is chosen because of its inherent robustness against parametric uncertainty and unmodeled dynamics. Two cases are considered to obtain two different control laws, in the first case, the designed control law depends on the swing angle of the payload, in the second case the control law does not depend on it. The control objective is to transport the payload from point to point, with swing reduction along trajectory. Experimental results using monocular vision based navigation are shown to evaluate the proposed control law.