ITER遥控运输车结构初步设计及分析

阐述了ITER遥控运输车整体结构和工作情况,运用有限元方法对整车分三种载荷情况进行静力学分析,并对遥控运输车取入真空室部件过程进行瞬态动力学分析,验证了各种情况下遥控运输车的安全性并给下一步的优化设计和实验提供了参考数据.     

Optimization of the Water-Cooled Structure for the Divertor Plates in EAST Based on an Orthogonal Theory

An orthogonal experimental scheme was designed for optimizing a water-cooled structure of the divertor plate.There were three influencing factors:the radius R of the watercooled pipe,and the pipe spacing L₁ and L₃.The influence rule of different factors on the cooling effect and thermal stress of the plate were studied,for which the influence rank was respectively R>L₁>L₃ and L₃>R>L₁.The highest temperature value decreased when R and L₁increased,and the maximum thermal stress value dropped when R,L₁ and L₃ increased.The final optimized results can be summarized as:R equals 6 mm or 7 mm,L₁ equals 19 mm,and L₃ equals 20 mm.Compared with the initial design,the highest temperature value had a small decline,and the maximum thermal stress value dropped by 19%to 24%.So it was not ideal to improve the cooling effect by optimizing the geometry sizes of the water-cooled structure,even worse than increasing the flow speed,but it was very effective for dropping the maximum thermal stress value.The orthogonal experimental method reduces the number of experiments by 80%,and thus it is feasible and effective to optimize the water-cooled structure of the divertor plate with the orthogonal theory.     

基于簇的无线传感网络流量负载的时隙调度协议*

针对大规模的无线传感器网络MAC协议在能量有效、低延时等方面的不足,提出一种基于簇的自适应时隙调度协议（ATSP）。整个网络由一些较小单位的簇组成,在每个簇内构造一棵数据聚集树,根据数据聚集树对节点每轮需要发送的数据流量进行加权,决定该节点的时隙大小;然后由簇头动态调节簇内节点时隙更新频率和顺序,可以降低时隙划分的能量和时间代价,减少节点的空闲侦听时间,避免串音。仿真表明,该协议有效地提高了网络能量有效性,延长了网络生存周期,降低数据包的延时。     

重载遥操作机械臂关键关节减速器设计

通过遥操作机械臂对核聚变实验堆装置进行内部维护是核聚变实验遥操作维护系统的重要任务之一。由于在遥操作维护中机械臂的关键关节将承担超大负载,且要求其中间预留电缆走线通道等特殊结构要求,需要对关键关节的主减速器进行特殊设计。以2K-H NN型多行星齿轮机构作为模型,分析了需要考虑的机构约束条件和设计条件,通过编程筛选获得满足条件的齿数组合,校核计算危险齿轮强度和传动效率,得到了一种承载能力高、结构紧凑的重载遥操作机械臂关节减速器的设计方案。     

Design,Analysis and R＆D of the EAST In-Vessel Components

In-vessel components are important parts of the EAST superconducting tokamak. They include the plasma facing components, passive plates, cryo-pumps, in-vessel coils, etc. The structural design, analysis and related R＆D have been completed. The divertor is designed in an up-down symmetric configuration to accommodate both double null and single null plasma operation. Passive plates are used for plasma movement control. In-vessel coils are used for the active control of plasma vertical movements. Each cryo-pump can provide an approximately 45 m^3/s pumping rate at a pressure of 10^-1 Pa for particle exhaust. Analysis shows that, when a plasma current of 1 MA disrupts in 3 ms, the EM loads caused by the eddy current and the halo current in a vertical displacement event （VDE） will not generate an unacceptable stress on the divertor structure. The bolted divertor thermal structure with an active cooling system can sustain a load of 2 MW/m^2 up to a 60 s operation if the plasma facing surface temperature is limited to 1500 ℃. Thermal testing and structural optimization testing were conducted to demonstrate the analysis results.     

无线传感器网络节点实时流量负载的时隙调度算法

目前无线传感器网络基于TDMA的MAC协议基本考虑节点处于连续工作而忽略事件驱动状态,没有考虑到复杂多变的网络环境,造成节点能量过度的浪费.提出了一种根据节点实时流量负载的时隙调度算法(TART),TART算法基于簇结构, 采用分布式与集中式相结合的方式,成员节点实时向簇首发送自己数据流量信息,由簇头动态调节簇内节点时隙更新频率和顺序,降低时隙划分的能量和时间代价,减少节点的空闲侦听时间.仿真表明,算法有效地提高了网络能量有效性,延长了网络生存周期,降低数据包的延时.     

并行设计环境下齿轮传动CAPP建模方法的研究

齿轮零件是典型的机械零件，针对齿轮传动的特点，提出并行设计环境下齿轮传动零件的CAPP系统的技术原理与实现方法。建立了参数化特征信息模型，提出关联特征约束推理和特征分组的方法。采用基于特征模型的工艺设计方法，建立了工艺知识库，提出了基于规则的工艺决策方法，使特征模型能较好地应用于齿轮传动CAD／CAPP设计。     

基于Web的远程教学模式下多媒体通信技术的应用

多媒体通信技术为远程教学模式创造了实时的交互式学习环境，使得当代的远程教育质量和效果大大提高，远程教育的大规模发展已成为可能。但我国目前的远程教育在某些方面还不尽人意，存在传输信息单一、传输速度慢、实时性差等问题，使得远程教学的效果受到很大影响和限制，而导致这些问题的关键是实时交互多媒体通信技术。本文即为华中师范大学网络教育学院周自波老师就基于Web的远程教学模式下实时交互多媒体通信技术的应用所做的一些探析。     

Optimization and Update of EAST In-Vessel Components in 2011

For safe operation with active water cooling plasma facing components (PFCs) to handle a large input power over a long pulse discharge, some design optimization, R&D and maintenance were accomplished to improve the in-vessel components. For the purpose of large plasma current (1 MA) operation, the previous separated top and bottom passive stabilizers in the low field were electrical connected to stabilize plasma in the case of vertical displace events (VDEs). The design and experiments are described in this paper     

Electromagnetic Modeling of the Passive Stabilization Loop at EAST

A passive stabilization loop (PSL) has been designed and manufactured in order to enhance the control of vertical instability and accommodate the new stage for high-performance plasma at EAST.Eddy currents are induced by vertical displacement events (VDEs) and disrup-tion,which can produce a magnetic field to control the vertical instability of the plasma in a short timescale.A finite element model is created and meshed using ANSYS software.Based on the simulation of plasma VDEs and disruption,the distribution and decay curve of the eddy currents on the PSL are obtained.The largest eddy current is 200kA and the stress is 68MPa at the outer current bridge,which is the weakest point of the PSL because of the eddy currents and the magnetic fields.The analysis results provide the supporting data for the structural design.