低干度并联双通道稳定性实验研究

本文介绍了低干度两相流自然循环并联双通道稳定性实验研究结果。对单通道与并联双通道的稳定性作了比较,研究了进口阻力系数不对称及加热功率不对称对稳定性的影响,以及并联双通道出口干度等条件下的稳定性特性。     

超临界流动不稳定性实验的通道不对称性研究

针对国内外超临界水流动不稳定性实验研究的匮乏,结合并联双通道实验研究和数值计算成果,对影响实验可行性的通道不对称性进行了分析和讨论。分析了超临界水并联双通道流动不稳定性实验中流量脉动的变化过程,并采用自编程序对系统的稳态特性和瞬态特性进行求解。结果表明：双通道流量不对称会降低实验的可行性;流量不对称性由几何结构不对称性引起;超临界水的物性变化规律导致流量不对称性在流体温度跨过拟临界的过程中被放大;流量不对称的程度受流体温度和双通道总流量影响,实验过程中可通过减小双通道总流量来提高实验的可行性。     

高性能波形记录卡的研制

本文介绍高性能波形记录卡的整体结构，着重说明记录卡的双通道性能一致，高速Ａ／Ｄ多段融发记录，较大容量存储器的设计和应用技巧。     

非均匀及非对称加热并联双通道流动不稳定性模拟研究

直流蒸汽发生器(OTSG)传热管间热负荷是不平衡的,不仅沿管长是非均匀的,而且各传热管间也存在偏差。为掌握OTSG实际工作状态下的流动不稳定性,本文采用Relap5程序分别对并联双通道在非均匀、非对称加热条件下的流动不稳定性进行了模拟研究。均匀加热和非均匀加热通道的总加热量相等,但非均匀通道的热流密度沿轴向分为3段,以模拟OTSG的3个相区。非对称加热双通道之间的加热量不相等,但其加热量之和与对称加热双通道加热量之和相等。非对称加热和对称加热双通道的轴向热流密度都是均匀的。研究结果表明：对于轴向非均匀加热条件,并联双通道内的流量相等,相位相反;高过冷度时非均匀加热稳定性优于均匀加热稳定性;随着过冷度逐渐降低,两者稳定性差异逐渐减小。对于非对称加热条件,并联双通道内的流量分配不再相等,但双通道内流量脉动频率仍相同,相位相反。热流密度低的通道内的质量流率更高,出口位置的壁温振幅较小。对称加热系统的稳定性优于非对称加热系统的稳定性。不对称度的增大,会加剧双通道内流量分配的不平衡,系统稳定性逐渐变差。     

HLS200MeV电子直线加速器的联锁装置

介绍ＨＬＳ２００ＭｅＶ电子直线加速器上所用的联锁保护系统，该联锁装置由联锁控制器，事故保护控制器和主控制盘组成。其中电子枪的触发采用双通道保护，其响应时间〈３０ｍｓ。     

双通道穆斯堡尔谱仪的两种接法

使用双通道穆斯堡尔谱仪同时测得两个穆斯堡尔谱是提高工作效率的一种有效途径。如果在通常的单通道穆斯堡尔谱仪的驱动器两端各加一个放射源,用两个探测器分别测取两个样品的穆斯堡尔谱,同时存储于一台多道分析器中,则组成了所说的双通道穆斯堡尔谱仪。如果使用带有透射窗的背散射探测器,使用一个放射源就可组成另一种形式的双通道穆斯堡尔谱仪,且有利于吸收谱与背散射谱同时测量。可见,把单通道穆斯堡尔谱仪改装     

5MW 供热堆超声波测量系统干扰分析

清华大学５ＭＷ供热堆超声波测量系统在运行过程中出现了一些异常现象。通过观察和分析后发现：多通道超声波测量系统是一个复杂的网络系统，各通道之间存在干扰。双通道系统实验表明：信号线间的分布电容导致干扰，分布电容越大，通道间干扰越严重。因此，在多通道超声波测量系统的工程设计中，应尽可能减小信号线间的分布电容。     

5MW供热堆声波测量系统干扰分析

清华大学５ＭＷ供热堆超声波测量系统在运行过程中出现了一些异常现象。通过观察和分析后发现：多通道超声波测量系统是一个复杂的网络系统。各通道之间存在干扰。双通道系统实验表明：信号线间的分布电容导致干扰。分布电容越大，通道间干扰越严重，因此，在多通道超声波测量系统的工程设计中，应尽可能减小信号线间的分布电容 。     

便携式双通道多道核谱仪中数据采集系统的设计

介绍应用FPGA为核心芯片配合峰保电路、高速A／D转换电路以及USB接口电路实现了便携式双通道多道核谱仪中数据采集系统；给出了软硬件的实现方案和实验结果；该系统具有采集精度高、传输快等特点，同时为进一步实现多通道信号采集提供了很好的参考价值。     

秦山核电二期工程反应堆冷却剂泵

介绍秦山核电二期工程主泵结构及主泵的监测和保护系统,重点介绍了秦山核电二期工程特有的双通道振动监测器及相关设备.     

Development and Integration of a Data Acquisition System for SST-1 Phase-1 Plasma Diagnostics

Long pulse(of the order of 1000 s or more) SST-1 tokamak experiments demand a data acquisition system that is capable of acquiring data from various diagnostics channels without losing useful data(and hence physics information) while avoiding unnecessary generation of a large volume data.SST-1 Phase-1 tokamak operation has been envisaged with data acquisition of several essential diagnostics channels.These channels demand data acquisition at a sampling rate ranging from 1 kilo samples per second(KSPS) to 1 mega samples per second(MSPS).Considering the technical characteristics and requirements of the diagnostics,a data acquisition system based on PXI and CAMAC has been developed for SST-1 plasma diagnostics.Both these data acquisition systems are scalable.Present data acquisition needs involving slow plasma diagnostics are catered by the PXI based data acquisition system.On the other hand,CAMAC data acquisition hardware meets all requirements of the SST-1 Phase-1 fast plasma diagnostics channels.A graphical user interface for both data acquisition systems(PXI and CAMAC) has been developed using LabVIEW application development software.The collected data on the local hard disk are directly streaming to the central server through a dedicated network for post-shot data analysis.This paper describes the development and integration of the data acquisition system for SST-1 Phase-1 plasma diagnostics.The integrated testing of the developed data acquisition system has been performed using SST-1 central control and diagnostics signal conditioning units.In the absence of plasma shots,the integrated testing of the data acquisition system for the initial diagnostics of SST-1 Phase-1 operation has been performed with simulated physical signals.The primary engineering objective of this integrated testing is to validate the performance of the developed data acquisition system under simulated conditions close to that of actual tokamak operation.The data acquisition is synchronized with a clock and trigger provided by the central timing system.     

Windows环境下数据采集程序设计

介绍了在Windows环境下数据采集程序设计的几种实现方法,分析了几种方法的优缺点．并指出了每种方法所适用的数据采集方式,方便核数据采集系统的开发人员实现数据采集程序的设计。     

旋转线圈测量系统信号采集设备的研制

研制了动态信号采集卡与具有特定功能的软件相结合的旋转线圈磁场测量系统。该测量系统的信号采集设备实现了PDI-5025积分器功能,且在采样率、量程、精度、灵活性等方面优于常规测量系统。本文对信号采集设备的研制方案、采集功能的实现及系统的可靠性和稳定性等进行了介绍。     

基于PXI Express的托卡马克同步数据采集系统设计

随着J-TEXT装置的发展,原有的数据采集系统在稳定性、模块化、采样率等方面已不能满足装置运行的需要,所以需建立一套新的数据采集系统来满足实验需求。本文介绍了基于PXI Express的托卡马克分布式高速同步数据采集系统的设计与实现。系统的采集单元由PXIe机箱NI PXIe-1062Q、PXIe控制器NI PXIe-8133和高速同步数据采集卡NI PXIe-6368组成,兼容ITER CODAC最新标准,具有良好的机械封装性、模块化程度高和高采样率等优点。系统采用同步差分采集方式采集实验数据,并将数据存储于核聚变领域通用的MDSplus数据库中。测试和使用结果表明,系统能在2 MSps采样率下连续稳定工作,可较好地满足装置运行的需要。     

An integrated knowledge base development tool for knowledge acquisition and verification for NPP dynamic alarm processing systems

Knowledge acquisition and knowledge base verification are important activities in developing knowledge-based systems such as alarm processing systems in nuclear power plants (NPPs). In this work, we developed an integrated tool, for knowledge acquisition and verification of NPP alarm processing systems, by using a G2 tool. The tool integrates the documents analysis method and extended colored Petri net (ECPN) matrix analysis method with backward simulation for knowledge acquisition and knowledge verification, respectively. This tool enables knowledge engineers to perform their tasks from knowledge acquisition to knowledge verification effectively and consistently.     

基于uClinux的嵌入式数据采集系统

介绍了一种基于uClinux的嵌入式数据采集系统,系统以ARM7TDMI类型的微处理器S3C4510B为核心.系统实现了高速数据采集和10/100M以太网的数据传输,可以很好地取代传统的基于8位处理器的数据采集.     

TRIUMF's Data Acquisition System

A flexible data acquisition system consists of a data acquisition task which is coupled to and under control of, a data analysis task. The data acquisition task is designed to interface to CAMAC through one or more Kinetic Systems 3912 Type A Crate Controllers to a Digital Equipment PDP-11/34, and it configures itself at the beginning of each run according to a user-written CAMAC definition file. The data analysis task is a modified version of the Fermilab Multi Channel Histogram Program. It controls the flow of the data acquisition task, and also serves as a multi channel pulse height analyzer.     

Knowledge acquisition for alarm processing systems of nuclear power plants using documents analysis

The knowledge acquisition is one of the most difficult and time-consuming activities in developing knowledge-based systems. In this work, we propose a novel knowledge acquisition method through documents analysis. The knowledge base can be built correctly, rapidly, and partially automatically by using this method. This method is especially useful when it is difficult to find domain experts. We apply this method to the knowledge acquisition for a simple dynamic alarm processing system (DAPS) for nuclear power plants and develop the alarm knowledge acquisition system (AKAS) for DAPS by using G2.     

Multiple-User Data Acquisition and Analysis System

The nuclear physics program at the Brookhaven National Laboratory High Flux Beam Reactor (HFBR) employs a pair of PDP-11 computers for the dual functions of data acquisition and analysis. The data acquisition is accomplished through CAMAC and features a microprogrammed branch driver to accommodate various experimental inputs. The acquisition computer performs the functions of multi-channel analyzers, multiscaling and time-sequenced multichannel analyzers and gamma-ray coincidence analyzers. The data analysis computer is available for rapid processing of data tapes written by the acquisition computer. The ability to accommodate many users is facilitated by separating the data acquisition and analysis functions, and allowing each user to tailor the analysis to the specific requirements of his own experiment. The system is to be upgraded soon by the introduction of a dual port disk to allow a data base to be available to each computer.     

二维阵列电离室探测器数据采集系统设计

介绍了用于对肿瘤放射治疗进行剂量验证的二维阵列电离室探测器的数据采集系统的设计与开发。文章描述了该二维阵列电离室探测器系统的构成以及工作原理,重点讨论了该探测器的数据采集子系统的设计过程,并完成了由前置放大器、前放控制器、数据采集控制器构成的数据采集子系统的开发。用户端可通过TCP/IP方式对探测器系统的参数进行设置,并进行数据高速采集、获取和进一步的处理。