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排序方式: 共有22条查询结果,搜索用时 15 毫秒
1.
探测器、传感器、执行器、FCS、DCS、SCADA、LAN/WAN、FS等自动化的基础技术是核电厂中的高技术,其标准化尚未反映在核电标准RRC或ANSI、ASME中,但在中国属于机械工业的范畴。其标准的多样性源自目的与方法的多样性,然而,这多样的基础技术标准提供了灵活的可选择性,且能避免整体引进的依赖性,加速核电厂的机-电-核整体技术标准的统一,而核电技术则能推进其发展。  相似文献   
2.
测量精度是单脉冲二次监视雷达的关键指标,在空中交通日益繁忙的情况下如何提高测量精度是急需解决的问题。文中分析了单脉冲二次监视雷达测量误差的来源和构成,对影响雷达距离测量精度和方位测量精度的主要误差项进行了详细的计算。结合工程实践,给出了提高精度的具体方法。  相似文献   
3.
基于多雷达数据融合的西屋航管雷达数据质量改善方法   总被引:1,自引:0,他引:1  
为改善西屋二次航管监视雷达数据质量,首先完成对接入系统的多部航管雷达数据的融合,将融合航迹转化为西屋航管雷达数据格式输出,重点解决了在转换过程中出现的几个关键技术问题,包括坐标变换、格式转换、和输出控制等,并将转换后的雷达数据在贵阳机场管制中心真实环境中进行了验证分析,在很大程度上解决了西屋雷达数据盲区,改善了探测边缘的误差,提高了雷达数据质量.  相似文献   
4.
KAERI has performed a series of experiments to investigate the performance of a prototype sparger for the APR1400 in view of a dynamic load oscillation with a variation of the test conditions such as a discharged air mass, a submergence of the sparger, the valve opening time, and the pool temperature during an air clearing phase. The air mass and pool temperature are in the range of 0.8–1.5 kg and 20–90 °C, respectively. The valve opening time can be adjusted within the range of 0.6–1.8 s. The maximum positive pressure amplitude, which is observed at the bottom of the quenching tank, is increased with the maximum header pressure of the sparger. The valve opening time has a considerable effect on the maximum amplitude. As the opening time decreases, the maximum amplitude at the tank wall is increased. Air mass and pool temperature, however, have a weak effect on the maximum amplitude. Oscillation frequency is decreased with an increase of the air mass in the range of 2.5–4.5 Hz.  相似文献   
5.
该文提出了一种能在高密度应答下,有效提取单脉冲二次雷达(MSSR)应答代码。并对应答代码的置信度进行实时标注的算法。该算法不仅能够一次完成对脉冲的应答代码提取与置信度标注,并且能同时完成OVERLAP和DEFRUIT处理,保证在多应答框架出现交叠时正确区分应答和置信度判断,为目标的点迹处理提供有效报表。  相似文献   
6.
7.
Hydrogen is considered to be an ideal energy carrier in the foreseeable future and can play a very important role in the energy system. A variety of technologies can be used to produce hydrogen. One of the most remarkable methods for large-scale hydrogen production is thermo-chemical water decomposition using heat energy from nuclear, solar and other sources. Detailed simulations of the two most promising water splitting thermo-chemical cycles (the Westinghouse cycle and the Sulphur-Iodine cycle) were performed in Aspen Plus code and obtained results were used for life cycle analysis. They were compared with two different processes for hydrogen production (coal gasification and coal pyrolysis). Some of the results obtained from LCA are also reported in the paper.  相似文献   
8.
The Japan Atomic Energy Research Institute (JAERI) and the United States Nuclear Regulatory Commission (USNRC) are jointly conducting confirmatory, integral testing on the Westinghouse AP600 reactor transient responses by using the ROSA-V Large Scale Test Facility of JAERI. This facility, built originally to simulate conventional 4-loop pressurized water reactors (PWRs), has been modified by adding components specific to the AP600 design. The modified LSTF now provides a full-pressure, full-height, 1130.5 volumetrically-scaled simulation of AP600. Five loss-of-coolant accident (LOCA) experiments were performed by August 1994, simulating transients initiated by cold leg breaks, a Pressure Balance Line (PBL) break, and inadvertently open Automatic Depressurization System (ADS) valves. These experiments indicated adequate core cooling and decay heat removal performance of the AP600 passive safety components.  相似文献   
9.
The effects of shot‐peening intensity on fretting fatigue crack‐initiation behaviour of titanium alloy, Ti–6Al–4V, were investigated. Three intensities, 4A, 7A and 10A with 100% surface coverage, were employed. The contact geometry involved a cylinder‐on‐flat configuration. Residual stress and improvement in fretting fatigue life were directly related to shot‐peening intensity. The magnitude of compensatory tensile stress and its location away from the contact surface increased with increasing intensity. The relaxation of residual stress occurred during fretting fatigue which increased with increasing the number of cycles. An analysis using a critical plane‐based fatigue crack‐initiation model showed that stress relaxation during the fretting fatigue affects life and location of crack initiation. Greater relaxation of the residual stress caused greater reduction of fatigue life and shifted the location of crack initiation from inside towards the contact surface. Modified shear stress range (MSSR) parameter was able to predict fretting fatigue crack‐initiation location, which agreed with the experimental counterparts. Also, the computed parameter showed an appropriate trend with the experimental observations of the measured fretting fatigue life based on the shot‐peening intensity.  相似文献   
10.
单脉冲二次监视雷达天线波瓣测量方案研究   总被引:1,自引:1,他引:0  
对单脉冲二次雷达工作原理作简要介绍,分析天线波瓣外部测量法与内部测量法的优缺点以及波瓣发生变形产生的后果,从而对外部测量法进行相应改进。使用振幅一相位法测试二次雷达天线水平极化图和垂直极化图,并给出幅相不一致和交叉极化影响的解决方法,最终设计了一套二次雷达天线极化测量系统。该系统为民航雷达检测中心的建设提供理论与实践指导。  相似文献   
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