Optimization studies of the ITER low field side reflectometer

Microwave reflectometry will be used on ITER to measure the electron density profile, density fluctuations due to MHD/turbulence, edge localized mode (ELM) density transients, and as an L-H transition monitor. The ITER low field side reflectometer system will measure both core and edge quantities using multiple antenna arrays spanning frequency ranges of 15-155 GHz for the O-mode system and 55-220 GHz for the X-mode system. Optimization studies using the GENRAY ray-tracing code have been done for edge and core measurements. The reflectometer launchers will utilize the HE11 mode launched from circular corrugated waveguide. The launched beams are assumed to be Gaussian with a beam waist diameter of 0.643 times the waveguide diameter. Optimum launcher size and placement are investigated by computing the antenna coupling between launchers, assuming the launched and received beams have a Gaussian beam pattern.     

Refractive and relativistic effects on ITER low field side reflectometer design

The ITER low field side reflectometer faces some unique design challenges, among which are included the effect of relativistic electron temperatures and refraction of probing waves. This paper utilizes GENRAY, a 3D ray tracing code, to investigate these effects. Using a simulated ITER operating scenario, characteristics of the reflected millimeter waves after return to the launch plane are quantified as a function of a range of design parameters, including antenna height, antenna diameter, and antenna radial position. Results for edge/SOL measurement with both O- and X-mode polarizations using proposed antennas are reported.     

汽车焊装生产线传输系统的改进与应用

通过对汽车生产线传输和驱动系统进行改进,应用机械优化思想,把滚珠丝杠系统改为液压传动系统,增加机动辊床的扭矩,使升降机、悬链、辊床系统之间传输顺畅,降低设备故障停工时间,降低维修成本,提高劳动生产率.实践证明了该方法的有效性,具有推广应用价值.     

在GSM网络中实现高压电力线路检测

根据目前高压输电线路分布广、作业环境恶劣的现状。本文介绍了基于GSM网络的无线检测系统,以现有成熟的GSM系统作为数据无线传输网络,在各分机与控制中心间采用AT指令集以短消息方式实现数据传输,实现了高压电力线路污秽情况的远程自动化实时监测,为线路状态检修提供了决策依据,大大提高了线路运行的安全性和输电线路技术管理水平。该系统具有精度高、稳定性强、抗干扰能力强、应用范围广、操作简便、免维护等优点,在实际检测中达到了良好的效果。     

一种低功耗的红外无线视频传输系统

设计了一套用于传送视频信号的低功耗红外无线传输系统.该系统以反熔丝工艺的FPGA器件作为编解码核心,高速串行红外收发器作为收发模组.FPGA内部配置了游程长度受限码作为红外信道编解码逻辑,并与缓冲、串并/并串转换、循环冗余校验、扰码/解扰等模块一起构成编解码核心.配合辅助的AD/DA接口电路,可实现对复合视频信号从采集缓冲、编码发射到解码回放的完整功能演示.该传输系统的位速率高达16 Mbit/s,而发射模块的功耗低于500 mW,适合应用于大型视频处理系统中作视频采集设备与视频处理设备间的无线接口.     

ITER遥控运输车双密封门系统FMEA分析

遥控运输车是国际热核实验堆(ITER,International Thermonuclear Experimental Reactor)用于堆和热室之间的运输工具.双密封门是遥控运输车上可分开,分别密封真空室窗1:7和运输车的关键部件.介绍ITER遥控运输车及双密封门结构与工作程序,对双密封门系统进行FMEA(Failure Modes and Effects Analysis)分析并作出分析表,找到薄弱环节,为防止及减少故障的发生提供依据.也为下一步ITER其他系统及重要部件的可靠性分析提供范例.     

Active spectroscopic measurements using the ITER diagnostic system

Active (beam-based) spectroscopic measurements are intended to provide a number of crucial parameters for the ITER device being built in Cadarache, France. These measurements include the determination of impurity ion temperatures, absolute densities, and velocity profiles, as well as the determination of the plasma current density profile. Because ITER will be the first experiment to study long timescale (～1?h) fusion burn plasmas, of particular interest is the ability to study the profile of the thermalized helium ash resulting from the slowing down and confinement of the fusion alphas. These measurements will utilize both the 1 MeV heating neutral beams and a dedicated 100 keV hydrogen diagnostic neutral beam. A number of separate instruments are being designed and built by several of the ITER partners to meet the different spectroscopic measurement needs and to provide the maximum physics information. In this paper, we describe the planned measurements, the intended diagnostic ensemble, and we will discuss specific physics and engineering challenges for these measurements in ITER.     

输电线路巡检机器人的设计与控制系统研究

文章介绍了一种新型的履带式高压输电线路巡检机器人,阐述了基于递阶控制理论的分级控制系统结构设计和基于规则库模型的专家控制系统控制策略,仿真验证了机器人越障动作过程的正确性。     

利用无人机对特高压线路上方电场强度实测

随着输电线路电压等级的提高,输电线路周围空间的电磁场强度越来越大,因此对它的空间电磁场分布研究变得越来越重要。针对输电线路上部空间电场强度值实际测试的难点,提出了一种采用小型无人机搭载测试设备进行输电线路上部空间电场强度的实测方法,通过对电磁场测试仪数据和所测试空间的位置数据实时采集,利用iO SD系统将测试数据进行实时合成,把测试数据存储并且传输到地面控制站,从而实现特高压线路电场强度的实测。通过对浙北-福州1 000 kV特高压交流等实际线路的实测分析,同时与Ansoft软件的计算值对比分析,在距离边相导线45 m内,仿真计算与实测值误差在7%以内,说明这种测量方法的有效性,为输电线路空间电磁环境研究具有重要参考意义。     

基于亮场条件下的光学系统透过率检测技术研究

在互相关原理的基础上提出一种新型的光学系统透过率测试方法,该方法采用调制光源获取调制交流光,调制交流光通过分光镜得到一定频率的调制测量光A与调制参考光B.测量光A与参考光B分别经滤光片进行光谱校正后被光电池接收,转换为电信号,并送入两路锁定放大器处理后,得到与出瞳光能量成正比的电信号,经A/D转换后送至上位机处理得到被测系统的透过率.该方法排除背景光等干扰,使透过率测试可以在亮场中进行,克服传统方法在暗室中单通道分时测试存在的缺点.实验结果表明,测试精度优于0.5%.     

液压油对液压系统副作用分析

依据液压油变劣的特征,分析了外界环境对液压油性能影响的原因,阐述了液压油对液压系统的副作用,并提出改善措施。     

The tri-band high-resolution spectrometer for the ITER CXRS diagnostic system

A tri-band high-resolution spectrometer, which was designed for performing diagnostics on the ITER facility using the charge-exchange recombination spectroscopy (CXRS), is described. The CXRS allows measurements of such plasma parameters as the ion temperature, the speed of the toroidal and poloidal plasma rotation, and the concentration of light impurities. The spectrometer is based on three transparent holographic diffraction gratings and is designed to operate simultaneously in three spectral bands: 468 ± 6 nm, 529 ± 6 nm, and 656 ± 8 nm. The results of measuring the main performance parameters of the transparent diffraction gratings and the spectrometer as a whole are presented. It was established that the characteristics of the developed spectrometer satisfy the requirements for the spectroscopic equipment for the ITER CXRS diagnostic system.     

侧边抛膜光纤传输特性的研究

本文通过实验的方法了解侧边抛磨光纤的传输性能,深度研究了不同抛磨深度、不同抛膜长度的侧边抛磨光纤,测量了不同抛磨深度光纤存在着波长相关损耗.本文利用轮式侧边抛磨法制作侧边抛磨光纤,具有插入损耗较低、成本低廉、可人为控制对倏逝场区域的利用、易于系统集成等特点.     

新型输电线路特征参数测试系统的研制

本文介绍了有别于传统方式输电线路特征参数测试系统的一种新型测量法，即变频法测量，将测量装置的测量信号的频率偏离工频50Hz，采用滤波技术消除带电线路对测量产生的异频干扰。文中说明了变频法测量原理、设计装置实体。实验室环境下实验状况、现场实验状况及结论。     

汽车混流自动线侧喷漆机器人控制系统的开发和应用

本文介绍了多品种汽车混流机器人喷漆自动线上的北京侧喷漆机器人的组成,工作过程,详细阐述了PLC控制程序的设计,探讨了采用PLC控制设备运行的方法。通过实际运行表明：该侧喷漆机器人控制系统的设计和开发应用是成功的,提高了生产效率。     

基于Fluent的ITER杜瓦的辐射换热分析

在ITER装置正常运行时,杜瓦内外温度不均,有一定的温度分布。考虑热辐射对杜瓦温度分布的影响,建立了用于辐射换热分析的杜瓦数值模拟模型,运用CFD软件Fluent对其进行数值模拟计算,得到杜瓦的温度分布,为后续的热应力分析提供了依据和参考。     

基于无场线电子扫描开放式磁粒子成像系统设计

磁粒子成像是一种全新的人体内动态靶向影像学方法,但当前磁粒子成像系统以封闭式磁场扫描结构为主,严重限制了其临床应用范围。设计了一种开放式电子扫描窄带磁粒子成像系统,在分析了超顺磁粒子谐波磁化响应的基础上,通过对线圈表面耦合磁场的计算及电流控制利用8个梯度线圈形成了基于无场线的开放式空间定位磁场,成像区域30 mm×30 mm;以单边激励线圈产生20.7 kHz激励磁场,处于高频激励磁场及定位磁场中的超顺磁纳米粒子示踪剂产生具有丰富谐波成分的可定位超顺磁磁化信号,使用高信噪比Gradiometer线圈检测其3次谐波信号形成电压云图图像;通过预测量的系统函数矩阵利用非负最小二乘法对电压云图进行重建,形成示踪剂浓度分布云图。成像实验结果表明,系统在开放式成像区域内探测灵敏度20μg Fe,图像重建空间分辨率2 mm,成像速度1 fps,达到了较好的开放式成像效果,系统也是国内首台全自主研发的开放式磁粒子成像系统。     

Fault diagnosis system for series compensated transmission line based on wavelet transform and adaptive neuro-fuzzy inference system

This paper proposes a new fault diagnosis approach based on combined wavelet transform and adaptive neuro-fuzzy inference system for fault section identification, classification and location in a series compensated transmission line. It performs an effective feature extraction approach based on norm entropy in order to obtain the features represented main frequency, harmonic and transient characteristics of the fault signals. The proposed method uses the samples of fault voltages and currents for one cycle duration from the inception of fault. The feasibility of the proposed method has been tested on a 400 kV, 300 km series compensated transmission line for all the ten types of faults using MATLAB/Simulink for a large data set of 23,436 fault cases comprising of all the 10 types of faults. Fault signals varying with fault resistance, fault inception angle, fault distance, load angle, percentage compensation level and source impedance are applied to the proposed algorithm. The results also indicate that the proposed method is robust to wide variation in system conditions and has higher fault diagnosis accuracy with regard to the other approaches in the literature for this problem.     

铝箔涂层线水冷辊温度场影响参数分析

铝箔涂层线水冷辊容易导致亲水铝箔产生"起皱"问题,其原因为使用完全水冷导致冷却速度过快,无法满足铝箔工艺要求.文中使用流体商用软件Fluent计算了铝箔冷却过程温度场,给出了流场温度分布及量化值比较.在此基础上,首先探讨了通过加置空气隔层改善铝箔"起皱"问题的可行性,并给出了空气隔层厚度对铝箔冷却过程的影响规律,其次探讨了水冷辊直径、包角、旋转速度等主要参数对冷却过程的影响规律并拟合出相应曲线.结果 表明:添加空气隔层可有效降低铝箔冷却速度,随着空气隔层厚度的增加,空气隔温效果增加,隔层设置为4～6 cm可满足铝箔生产工艺要求;铝箔冷却温度与水冷辊直径、包角呈线性关系,与水冷辊旋转速度呈反比关系.     

Automated system for determining frequency dependent parameter model of transmission line in a laboratory environment

This work presents an automated system for determining transmission line model parameters at various frequencies. The system was developed and implemented on General Electric test reactors designed to model power transmission line behavior in a laboratory environment. The measurement system and data processing are controlled and automated via custom developed LabVIEW software. Measurements are obtained from voltage and current probes interfacing with oscilloscopes. This data is then acquired and processed in LabVIEW software. The structure of the transmission line model, desired confidence level and number of tests to conduct are specified user inputs. The system subsequently provides the transmission line impedance parameters based on these specifications. These parameters are calculated using both time domain and frequency domain techniques. While this work focuses on determining transmission line model parameters, this automated test measurement system is applicable to any device that can be parameterized via a current–voltage (I–V) characteristic or frequency response.