电力机车弓网故障监测系统

介绍了一种电力弓网故障系统,该系统利用安装于机车电力弓上的冲击加速度传感器和限顺,监测电力弓与异物碰撞和接触导线在弓上左右位移超限的故障,通过红外发光管发送故障的编码信号,由司机室顶部的红外接收电路接收,解码并处理。本系统可发现电力机车弓网的隐患,已在电力机车上试用。     

电力机车弓网故障的动态监测系统

目的　实时监测电力机车弓网故障 .方法　利用冲击加速度传感器以及左右限位传感器 ,实现对弓网故障的监测 .结果　设计了一套动态监测系统 ,当电力机车弓网发生故障时 ,系统能及时报警 ;同时系统还有自复位功能 .结论　司机能及时了解列车运行的情况 ,避免造成不必要的损失 .整个系统操作简单、方便灵活     

电力机车弓网故障的动态监测系统

目的 实时监测电力车弓网故障。方法 利用冲击加速度传感器以及左右限位传感器，实现对弓网故障的监测。结果 设计了一套动态监测系统，当电力机车弓网发生地，系统能及时报警同时系统还有自复位功能。结论 司机能及时了角列车运行的情况，避免造成不必要的损失。整个系统操作简单、方便灵活。     

SS4B型电力机车PDU受电弓升降保护装置的研究

本文阐述了受电弓在机车安全运行中的重要性,及受电弓的工作原理。针对直流机车因风压不足发生弓网故障的问题,PDU受电弓升降保护装置的系统构成、工作原理进行了具体说明,以避免发生弓网故障,提高了机车运行的效率和安全性。     

电力机车故障处理方法

为了减少机车缩短机车整备检修时间，提高机车利用率，以朔黄线的韶山四型电力机车为例，为电力机车的故障处理制定出基本的原则和方法。     

浅谈电力机车通风系统

电力机车是指由电动机驱动车轮的机车,它是从外界撷取电力作为能源驱动的铁路机车,电源包括架空电缆、第三轨、电池等,其所需电能由电气化铁路供电系统的接触网或第三轨供运行中的电力机车给,是一种非自带能源的机车。电力机车具有功率大、过载能力强、牵引力大、速度快、整备作业时间短、维修量少、运营费用低、便于实现多机牵引、能采用再生制动以及节约能量等优点。电力机车自1914年来到中国到今天,电力机车向大功率、高速、耐用方面不断发展,为保证电力机车没有空气污染,通风问题备受关注。     

光伏式智能水塔监测控制系统的设计与实现

为了解决广大农村地区的水塔自动化程度低、容易发生缺水和溢水现象、浪费人力电力资源等问题,该文设计了基于STM32的光伏式水塔智能监测控制系统。通过ZigBee无线网络接收传感器信号,利用NXP公司推出的STM32微控制器作为主机和子机的控制核心,使监测系统可以实时地对接收到的传感器信号和信息进行运算处理,实现对水位、水质、水压和水温的实时监测,同时具有增压、清污、防干抽和防漏水的功能。     

基于单片机的机械加工安全保护装置研究

利用红外发送接收装置,红外接近传感器,以单片机Atmega128为中央处理单元,研制开发了一种将机械生产过程中的危险区域分为两个等级,并给出不同的监测方法和危险事件发生时的处理方法,实现了降低生产现场事故几率的目的。文章中介绍该系统的原理,硬件设计和系统的软件设计并部分介绍了系统的应用过程。     

一种智能型直流机车主、辅回路绝缘检测装置

为解决机车主辅回路接地导致的电力机车供电系统故障问题,本文研制开发了一种智能型直流机车主、回路绝缘检测装置,通过对主辅回路的接地电阻测量和判断,实现对机车主辅回路的绝缘检测和对机车接地故障的预报警。     

防止SS4改型电力机车非正常制动的对策

非正常制动在机车运用中时有发生，给安全生产带来了极大的隐患。本文阐述了一种防止电力机车非正常制动的报警装置，该装置在SS4改型电力机车上的使用，有效地减少了此类问题的发生，为机车的安全运用提供了有力的保障。     

交-直-交型电力机车网侧谐波对牵引变电所的影响及改进

本文分别对比介绍了新型交-直-交型大功率电力机车和以SS4为代表的传统型交-直型电力机车的主电路拓扑结构及其网侧电流谐波特性。由测试结果表明大功率电力机车与传统电力机车相比最显著的特征是其谐波特性不同,并分析了网侧谐波对牵引变电所电气设备造成的影响和采取的相应的技术改进措施,确保牵引供电系统的正常运行。     

3D nanoporous nanowire current collectors for thin film microbatteries

Conventional thin film batteries are fabricated based on planar current collector designs where the high contact resistance between the current collector and electrodes impedes overall battery performance. Hence, current collectors based on 3D architectures and nanoscale roughness has been proposed to dramatically increase the electrode-current collector surface contact areas and hence significantly reduce interfacial resistance. The nanorod-based current collector configuration is one of several 3D designs which has shown high potential for the development of high energy and high power microbatteries in this regard. Herein we fabricate a nanoporous nanorod based current collector, which provides increased surface area for electrode deposition arising from the porosity of each nanorods, yet keeping an ordered spacing between nanorods for the deposition of subsequent electrolyte and electrode layers. The new nanostructured 3D current collector is demonstrated with a polyaniline (PANI)-based electrode system and is shown to deliver improved rate capability characteristics compared to planar configurations. We have been able to achieve stable capacities of ~32 μAh/cm(2) up to 75 cycles of charge/discharge even at a current rate of ~0.04 mA/cm(2) and have observed good rate capability even at high current rates of ~0.8 mA/cm(2).     

A flex-compressive-mode piezoelectric transducer for mechanical vibration/strain energy harvesting

A piezoelectric transducer for harvesting energy from ambient mechanical vibrations/strains under pressure condition was developed. The proposed transducer was made of two ring-type piezoelectric stacks, one pair of bow-shaped elastic plates, and one shaft that pre-compresses them. This transducer works in flex-compressive (F-C) mode, which is different from a conventional flex-tensional (F-T) one, to transfer a transversely applied force F into an amplified longitudinal force N pressing against the two piezo-stacks via the two bowshaped elastic plates, generating a large electric voltage output via piezoelectric effect. Our experimental results show that without an electric load, an F-C mode piezo-transducer could generate a maximum electric voltage output of up to 110 Vpp, and with an electric load of 40 κΩ, it a maximum power output of 14.6 mW under an acceleration excitation of 1 g peak-peak at the resonance frequency of 87 Hz.     

电气化铁路的负荷特性及电能质量分析

本文从电气化铁路的负荷特性出发,分析了电力机车的电气特性、列车的牵引特性及牵引变电所的负荷特性,并结合电气化铁路牵引供电方案,分析了电气化铁路的供电需求及电能质量特性,提出应结合铁路负荷特性和电网条件,完善电气化铁路供电方案和电能质量综合治理措施。     

一起分子筛再生故障的应急处理与分析

介绍了一起因电加热器未启动而导致分子筛再生失败的故障和处理措施，分析了故障原因，阐述了为避免类似故障再次出现而在仪控方面所采取的改进措施。     

一起分子筛再生故障的应急处理与分析

介绍了一起因电加热器未启动而导致分子筛再生失败的故障和处理措施,分析了故障原因,阐述了为避免类似故障再次出现而在仪控方面所采取的改进措施。     

Energie- und CO2-Bilanzen von Solarkollektoranlagen

Energy systems based on solar collectors or other renewable energy sources are normally regarded as CO₂ zero-emission systems because nearly no fossil fuels are used to operate the systems. But the complete evaluation of an energy system concerning its CO₂ reduction potential must not be restricted to the emissions during the operation of the system. The cumulative energy demand and the cumulative CO₂ emissions during the life cycle have to be considered. In case of a solar collector system, in particular the production-determined emissions and emissions due to the requirement of auxiliary electric power for the collector pump are important. An energy analysis is this kind was performed for solar domestic hot water systems. It is shown that the consideration of the life cycle emissions reduces significantly the CO₂ reduction potential of solar collector systems whereby the design of the system has a major influence.     

Moving towards high-power, high-frequency and low-resistance CNT supercapacitors by tuning the CNT length, axial deformation and contact resistance

In this paper it is shown that the electrochemical behaviour of vertically aligned multi-walled carbon nanotube (VANT) supercapacitors is influenced by the VANTs' length (electrode thickness), by their axial compression and by their interface with the current collector. It is found that the VANTs, which can be interpreted as a dense array of nanochannels, have an active area available to ions that is strongly affected by the electrode's thickness and compressional state. Consequently, the tested thinner electrodes, compressed electrodes or a combination of the two were found to be characterized by a significant improvement in terms of power density (up to 1246%), knee frequency (58,822% working up to 10 kHz), equivalent series resistance (ESR, up to 67%) and capacitance (up to 21%) when compared with thicker and/or uncompressed electrodes. These values are significantly higher than those reported in the literature where long VANTs with no control on compression are typically used. It is also shown that the ESR can be reduced not only by using shorter and compressed VANTs that have a higher conductance or by improving the electrode/collector electrical contact by changing the contact morphology at the nanoscale through compression, but also by depositing a thin platinum layer on the VANT tips in contact with the current collector (73% ESR decrease).     

Fe-Ga合金发音振子换能器的多场耦合模型

建立了Fe-Ga合金弓张结构发音振子换能器电场、磁场和固体力学场的多场耦合模型,研究了发音振子换能器磁场强度、磁感应强度和应变分布情况,并进行了换能器在不同频率下的磁场强度分析和模态分析。分析发现,随着频率的增高,Fe-Ga合金发音振子换能器的磁场强度逐渐减小,计算得到换能器的共振频率为984 Hz。测试了Fe-Ga合金换能器中的核心元件Fe-Ga合金的磁场强度与应变的关系,当磁场强度饱和值为40 k A·m-1时,应变为70×10-6。搭建了磁致伸缩材料磁特性测试系统,测试了Fe-Ga合金磁场频率为5、20、50 Hz的磁滞曲线,并测试了Fe-Ga合金的应变随频率的变化曲线,实验结果与换能器中Fe-Ga合金的应变仿真结果一致。