Evolution of the Design of Cold Mass Support for the ITER Magnet Feeder System

This paper presents the evolution of the design of cold mass support for the ITER magnet feeder system. The glass fibers in the cylinder and the flanges of the normal G10 support are discontinuous in the preliminary design. The heat load of this support from the analysis is only 4.86 W. However, the mechanical test of the prototype showed that it can only endure 9 kN lateral force, which is significantly less than the required 20 kN. So, the configuration of the glass fibers in the cylinders and flanges of this G10 support are modified by changing it to a continuous and knitted type to reinforce the support, and then a new improved prototype is manufactured and tested. It could endure 15＇kN lateral forces this time, but still not meet the required 20 kN. Finally, the SS316LN material is chosen for the cold mass supports. The analysis results show that it is safe under 20 kN lateral forces with the heat load increased to 14.8 W. Considering the practical application, the requirements of strength is of primary importance. So, this SS316LN cold mass support is acceptable for the ITER magnet feeder system. On the other hand, the design idea of using continuous and knitted glass fibers to reinforce the strength of a G10 support is a good reference for the case with a lower heat load and not too high Lorentz force.

Dynamic Analysis for the Global Performance of An SPM-Feeder-Cage System Under Waves and Currents

In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodynamics coefficients of the vessel are calculated by using a 3D diffraction/radiation panel program. First- and second-order wave forces are included in the calculations. Morison equation is used to compute the drag force on line elements representing the net. Drag coefficients are determined at every time step in the simulation considering the relative normal velocity between the structural elements and the fluid flow. The dynamic response of the coupled system is analyzed for various environments and net materials. The results of the study show the effects of solidity ratio of the net and vertical positions of the cage on the overall dynamic response of the system, confirming the viability of this type of configuration for future development of offshore aquaculture in deep waters.

Research on communication system of underground safety management based on leaky feeder cable

According to the current working status of underground safety management and production scheduling, the importance and existed problem of underground mine radio communication were summarized, and the basic principle and classification of leaky feeder cable were introduced and the characteristics of cable were analyzed specifically in depth, and the application model of radio communication system for underground mine safety management was put forward. Meanwhile, the research explanation of the system component, function and evaluation was provided. The discussion result indicates that communication system of underground mine safety management which is integrated two-way relay amplifier and other equipment has many communication functions, and underground mine mobile communication can be achieved well.

Optimisation of Electrical Distribution System by Using Solar Thermal Powered Systems and Its Impact on Electrical Distribution Feeders

In this research, the performance of the solar thermal powered systems (STPS) is analyzed with different models (without inserts, with inserts and with Nano fluids with different concentrations) and its impact on the Electric load in a residential/Institutional Electrical Distribution system. For this purpose, the electrical and solar thermal water heater is tested and validated. Solar thermal powered systems and its impact on the Institutional electrical distribution feeders are tested and compared with the energy efficiency (EE) and cost optimization. The goal of this paper is to analyze the impact of solar thermal energy on electrical energy consumption in the electrical distribution feeder level. The electrical system cost and energy consumptions are tabulated and observed that there is a considerable savings.

Design of Weigh Feeder Control System for Energy Saving Using Performance-Adaptive Method

This paper discusses a design method for the control system of a weigh feeder that supplies powder and granular material at a constant rate. Most weigh feeders employed in industry are controlled by proportional and integral （PI） compensation, and the control performance is decided by the selection of parameters. To attain advanced control performance by PI control, the PI parameters are designed on the basis of generalized minimum variance control （GMVC）. In this study, to achieve user-specified control performance by GMVC-based PI control, the design parameters of GMVC are automatically adjusted using a performance-adaptive method. The control performance discussed in this study consists of the variance of the control error and that of the difference in the control input. In a conventional performance-adaptive method, the variance of the control error is reduced. In this study, to reduce energy consumption and to achieve user-specified control performance, the variance of the difference in the control input is specified and the design parameter is determined. To demonstrate its effectiveness, the proposed method is applied to an actual weigh feeder.

Substation Supervisory System Basedon Feeder Control Units

This paper introduces a kind of Feeder Control Units (FCUs) which treat feeders or main transformers as its objects. Being carefully designed, the FCU can separately meet the requirements such as signals’ acquisition, local control, on-time switchgear interlocking, etc. Equipped with a sort of high-speed serial communicahon interface, the FCUs can be distributively arranged near or into the switchgear, therefore a kind of distributed substation supervisory system can be formed.

BRFS计量泵自动加药系统在白音诺尔铅锌矿设计及应用

随着经济的不断发展,国家对矿产资源的需求越来越大,促使选矿厂不断扩大生产规模,改善生产工艺,满足经济和社会发展需要。赤峰中色白音诺尔矿业有限公司积极响应国家号召,对生产工艺进行改造,将处理量由当前的3000 t/d扩大到5000 t/d,其配套的工艺设备也进行相应的升级。然而,当前使用的电磁阀加药机由于药剂添加量不足、精度低等原因已经被停用,选矿厂迫切需要一种能够实现大流量药剂的添加、高精度高且小维护量的自动加药系统。为了解决选矿厂遇到的困难,矿冶科技集团有限公司与矿山技术人员根据选矿厂的实际需求设计了BRFS计量泵自动加药系统。该系统经过在选矿厂连续三个月的工业应用,较好地解决了药剂自动添加困难的问题,功能完全满足选矿厂的需求,为选矿厂带来了可观的经济效益。

中波广播三频共塔天调网络的设计与实现

本文针对广播电视无线发射台站技术建设工程中的中波天馈线系统,特别是对于三频共塔工程的设计、安装与调试进行了详细的描述。结合工程实践,本文在多频率和多种功率复杂环境下提出了中波广播三频共塔天调网络的设计关键,并总结了安装与调试经验,特别针对小功率设备抑制同台大功率设备的处理方法进行了探讨,供同行借鉴。

卷接机组自动供料机与物流系统通信接口的设计

YF75型超高速双辅料供应站(以下简称YF75双机站),主要由一个单独自动机械手组成,用于为卷接机组连续供给卷烟纸和水松纸材料,实现材料自动装载和余料自动剔除功能。为保证YF75双机站自动连续供给辅料,YF75双机站需与物流系统AGV自动送料机器人对接,自动完成“退空托盘”和“要料”等任务,才能保证车间卷烟纸和嘴棒水松纸来料供应连续正常工作,因此设计两者之间的通信接口尤为重要。

中波发射台天馈线系统的维护与管理

天馈线系统是中波广播发射系统的重要组成部分,也是中波发射台的主要设备之一。基于此,首先介绍中波发射台天馈线系统的构成,然后针对当前广播电视设施维护的严格要求,提出具体的管理措施,包括注重日常保护、严格执行机房值班制度及制定应急预案。

固态化、数字化中波发射机对天馈线系统的技术要求

固态化、数字化中波发射机作为一种新型、高效的发射设备,因其突出的性能优势在各发射台得到广泛应用。该发射机对天馈线系统的匹配指标相比传统发射机要求较高。针对这一问题,基于固态化、数字化中波发射机的特点,结合对天馈线系统的频率响应、电压驻波比、匹配阻抗、防雷性能、稳定性及可靠性等各方面的技术要求展开详细论述,对其实际应用和推广提供技术支持和指导,具有一定的实用价值。

调频广播天馈线系统备份设计与实现

广播电视无线发射系统中,随着发射功率的不断增大,天馈线系统作为单节点设备所面临的压力和潜在的安全隐患随之增加。对此,探讨调频天馈线系统备份的重要性和必要性,重点介绍目前天馈线备份的常见方式和天线极化以及技术方案的设计与实现等。

基于移相网络的广播电视防雷应用原理分析

移相网络防雷技术相较于传统的防雷方法,具有移植性佳以及防雷效果显著等优势。本文在阐述移相网络构成的基础上,重点探讨了实现移相防雷原理的过程,系统分析了移相网络的技术特点,并指出了其适用的应用领域,为广播电视安全播出在防雷系统建设方面提供了一种具有参考价值的方案。

小功率短波发射站天馈线系统干扰因素分析

短波通信是无线电通信的重要方式之一,能够与有线光缆通信、卫星通信、超短波通信等技术融合使用。天馈线系统作为短波发射站发射系统的末端设备,其工作性能将直接影响短波通信质量。对于小功率短波发射站而言,天馈线系统一旦受到干扰,将影响发射系统的整体工作效率。基于此,分析小功率短波发射站天馈线系统的工作原理及干扰因素,并通过仿真实验给出干扰的影响效果,以期为技术人员制定针对性的抗干扰措施提供借鉴。

天馈系统对发射机稳定性的影响及优化策略

随着数字电视技术的发展,天馈发射系统的应用日益广泛。作为发射系统核心设备的发射机,其输出功率、频率和相位稳定性对于信号传输质量至关重要。介绍天馈系统与发射机的工作原理,分析天馈系统中天线、馈源和信号接收性能变化如何影响发射机各项参数的稳定性,提出从天馈系统优化设计、发射机本体改进、增加滤波器以及提高微波器件稳定性等方面的技术对策,旨在为改善发射机频率响应、输出功率稳定度和误码率指标,增强发射机的抗扰能力提供参考。

自动送料器气动系统改进设计

以某小微冲压模具厂因薄板材料自动送料器在使用中经常出现故障影响其生产效率,且设备在安装过程中要在机床上打孔,对机床有损伤为背景,在不增加过多成本的基础上,对其气动系统进行改进设计,同时对控制系统的电路做详细设计,给出推、拉料气路系统设计图及电控系统设计图,详细描述其工作原理。将改进设计完成后的气动及电控系统在FluidSIM 4.2软件中建模并仿真,分析各缸的位移、速度-时间特性曲线;给出设计完成后系统的封装图和封装说明;最后将改进后的气动系统与原系统作对比分析,总结其各自的优、缺点。结果表明:改进设计后的气动系统不仅降低了设备的故障率,避免了在机床上开孔的弊端,还能实现送料速度的有效控制,给设备后期的维护、保养带来便利,为系统的进一步升级改造指明了方向。

基于机器视觉的小型自动穿串机给进器同步控制技术

给进器是穿串机的关键硬件。针对控制难度较大的问题,研究一种基于机器视觉的小型自动穿串机给进器同步控制技术。分析穿串机给进器结构,构建机器视觉(摄像机)内、外参数模型,标定摄像机空间位置;采集给进器视觉图像,应用Roberts算子细化处理给进器视觉图像;基于PID原理设计模糊控制器,计算得到给进器同步控制模糊输出结果,完成肉块的自动穿串同步控制。实验数据表明:在不同实验工况下,应用提出技术获得的给进器同步控制时延最小值为2 s,穿串成功率最大值为96%。给进器同步控制时延较短,穿串成功率较高,控制效果更佳,进一步提升工作效率。

称重给煤机控制系统的优化

针对某煤矿称重给煤机控制系统老旧、控制品质下降、运输精度低、故障率高且不易排查等问题,利用PLC可编程控制技术和变频调速技术优化改造给煤机控制系统,重点阐述优化方案的工作原理、PLC控制设计,变频调速设计等内容。经应用,优化后的系统实现了给煤机的自动化控制,提高了给煤机的运输精度、操控性、可靠性,同时还降低了人力成本。

浅析地铁直流牵引供电系统馈线保护

在地铁牵引供电系统运转中,持续性和可靠性是最基础的要求,要想保障地铁牵引供电系统的正常运转,馈线保护技术的应用是十分重要的手段。在具体实施地铁直流牵引供电系统馈线保护的时候,常用的技术类型包括大电流脱扣保护、定时过电流保护、接触网过热负荷保护、框架泄漏保护、双边连跳保护、自动重合闸技术等,这些技术对于地铁直流牵引供电系统馈线保护都能发挥十分重要的促进作用,但是在应用过程中,其作用机制也存在一定的差异性,基于此,本章就上述内容展开详细阐述。

基于系统保护的配电网馈线故障处理技术

本文探究了基于系统保护的馈线故障处理技术。相比于基于重合器的馈线故障处理,该技术具有故障识别精准、故障隔离及时、自动化程度高等特点,在保证配电网可靠运行和提供电能质量方面有良好效果。馈线系统保护采用主保护和后备保护相结合的方式,确保在通信发生故障的情况下也能快速隔离故障。从实验结果看,系统保护装置可以在150 ms内完成故障处理,满足配电网安全、可靠运行的要求。