徐工RP1356智能型沥青混凝土摊铺机性能分析

RP1356智能型沥青混凝土摊铺机是一种具有机群智能化联合作业、远程监控和高精度控制等多项国际先进技术的大型筑路施工机械。文章从节能环保、智能控制、人性化设计等方面介绍了该机械的优越性能,为道路修筑、养护等工程机械的选用提供参考。     

基于综合科技的智能交通实训系统的研制

文章介绍了集机械、液压、电子、光学、控制、计算机、传感器、PLC、信息采集等多学科技术于一体的智能交通实训系统的技术原理,阐述了所研制的基于综合科技的智能交通实训系统各子系统的组成、运作方式及教学用途。     

Construction Techniques for the Small-radius Curved Shield Tunnels in Water-rich Fractured Stratum with High Pressure北大核心CSCD

A variety of construction problems, such as bad cutting effects of cutters, unreasonable boring parame- ters and blowout, are often encountered during shield tunnelling under unfavorable geological conditions. Aimed at these construction difficulties of high pressure, abundant underground water, fractured rock stratum, long distance and small-radius curves of Fuzhou metro, the mechanical behaviors of cutting tools were analyzed through theoreti- cal calculations of cutter cutting force, then the reasonable cutter configuration, tunneling parameters and the proper time for cutter replacement were presented. Some measures, such as screw conveyor renovation, mucking control and lowering of groundwater, were adopted for controlling blowout based on practice. The stability of excavation face was analyzed by numerical simulation, and the measures for shield boring and posture control in the long distance and small radius curved tunnels were summarized. The conclusions are as follows: 1) when shield machine is driven in fractured stratum, the effect of lateral impact force produced by spalling rock on cutter will be very large and rein- forcement is needed for cutter; 2) cutter replacement should be taken at proper time based on muck samples in con- ditions of increasing of total shield thrust by 4 000-7 000 kN, cutter torque by 1 000-1 500 kN•m and driving speed smaller than 10 mm/min; 3) adopting screw conveyor device with innovative anti-blowout devices and control measures for ground precipitation and mucking, it controls blowout effectively; 4) the maximum axis offset and the height offset of segment meet the requirements of shield construction specifications during shield construction of long distance small-radius curved tunnel. © 2018, Editorial Office of "Modern Tunnelling Technology". All right reserved.     

UPS电源的SPWM控制技术

分析了UPS电源逆变单元的工作原理,研究了SPWM波形及死区产生机理,设计了一种基于C8051F来实现UPS电源的SPWM控制的方法,并且采用了简便的硬件电路来实现SPWM中的死区控制;仿真与实验结果表明本文提出的控制方案是可行的。     

交互式电子技术手册在通信装备中的应用设计

结合通信装备在交互式电子技术手册（IETM）的保障需求,分析了IETM的信息结构,介绍了国内外IETM发展情况,给出了通信装备的IETM设计原则和总体要求,设计了通信装备的IETM系统,详细分析了资料查阅和专家系统模块的功能和要求,在系统的标准化方面,参考了美军标和国内相关标准,保障了系统的可扩展性和可扩充性。     

Suppression of thrust fluctuation of doubly-fed linear motor

Because the mover and stator of a doubly-fed linear motor are both equipped with three-phase windings,the motor enables contactless energy to be transferred from the stator to the mover.Thus,when a dou...     

关于900 t铁路架桥机钢结构焊接检验采用标准的探讨

研究目的：架桥机的安全可靠性和正常使用寿命在很大程度上取决于自身钢结构焊接质量的好坏,而科学、适宜的检验是焊接质量和结构安全的保证.目前,国内在900 t级铁路架桥机钢结构的制造及焊接检验方面,还没有专门的规范或规程,需要对此进行研究,以满足900 t级铁路架桥机的检验需要。 研究方法：对比、分析几种国家和行业规范或规程中的钢结构焊接检验标准。 研究结果：总结出一套适于900 t铁路架桥机钢结构焊接检验的标准。 研究结论：该套标准可作为同类铁路架桥机生产、检验的参考性标准。     

用于直流电动转辙机的高频开关电源设计

针对目前工频直流电动转辙机电源，提出一种利用高频开关电源技术研制的新型开关电源。该电源采用双管双正激变换技术、功率因数校正技术（PFC），实现了大功率高电压输出。详细论述了该电源模块的组成和工作原理。实际使用证明，该电源完全可以替代目前的工频电源。     

移动总机业务探讨

移动总机业务是一种基于移动智能网技术实现的增值业务。本文就其业务特征及实现进行了探讨,并与综合VPMN业务做了比较。     

基于MFC的多线程编程技术在插销试验机微机控制系统中的应用

介绍了在Windows95下基于MFC的多线程编程技术及其在插销试验机微机实时控制系统中的应用,着重阐述了在插销试验机微机控制系统中多线程的同步问题,并给出了编程实例。