This study deals with a new evaluation method of nuclear electromagnetic pulse （NEMP） vulnerability on cots electronic equipments. The method consists in comparing electromagnetic compatibility （EMC） test severiti...This study deals with a new evaluation method of nuclear electromagnetic pulse （NEMP） vulnerability on cots electronic equipments. The method consists in comparing electromagnetic compatibility （EMC） test severities to NEMP conducted stresses. The comparison uses five characteristic criteria of the induced stresses, calculated with an analytic method. The process is based on a software named ＂SUSIE＂ （in French： SUSceptibilite a I＇IEMN ＂Impulsion ElectroMagnttique d＇origine Nucl6aire Haute Altitude＂）. Today, only conducted stresses are analyzed. An evolution is planned in 2013 to determine the equivalent vulnerability of radiated stresses and to validate the software.展开更多
The solidified structures of horizontally continuous casting（HCC） of super-thin slab and its relations with the current were studied under the electromagnetic vibration（EMV）.The results show that,under the action ...The solidified structures of horizontally continuous casting（HCC） of super-thin slab and its relations with the current were studied under the electromagnetic vibration（EMV）.The results show that,under the action of the periodical forces from EMV,the solidified structures of the super-thin slab of pure tin is greatly refined,and the extent of grain refinement is increased with the magnitude of alternating current.For the Sn-10%Pb alloy,it is shown that the EMV promotes the growth of equiaxed grains in the center of super-thin slab,and the grains are refined with the alternating current increasing.This is useful to prevent some solidification defects in the horizontally continuous casting of super-thin slab,such as columnar grains butting,porosity,inclusions and gases gathering,and composition segregation in the centre of slab.展开更多
针对甚高频无线通信设备工作在高空电磁脉冲主要能量频谱范围内,生存能力受到严重威胁的问题,研究了甚高频无线通信系统的电磁脉冲易损特性,使用矩量法(method of moment,MoM)和CST软件分别求解了天线端口电流响应和舱体内耦合电场波形...针对甚高频无线通信设备工作在高空电磁脉冲主要能量频谱范围内,生存能力受到严重威胁的问题,研究了甚高频无线通信系统的电磁脉冲易损特性,使用矩量法(method of moment,MoM)和CST软件分别求解了天线端口电流响应和舱体内耦合电场波形,确定了主要耦合通道和脉冲辐照试验等级。分别开展了天线和主机脉冲辐照试验,发现了脉冲冲击射频前端造成电源模块故障的“间接效应”现象。通过效应机理分析,确定了故障器件和失效原因。最后给出了防护建议:使用旁路泄放和稳态滤波的组合防护设计思路进行防护优化,要求防护器后端残余电流小于10 A。展开更多
文摘This study deals with a new evaluation method of nuclear electromagnetic pulse （NEMP） vulnerability on cots electronic equipments. The method consists in comparing electromagnetic compatibility （EMC） test severities to NEMP conducted stresses. The comparison uses five characteristic criteria of the induced stresses, calculated with an analytic method. The process is based on a software named ＂SUSIE＂ （in French： SUSceptibilite a I＇IEMN ＂Impulsion ElectroMagnttique d＇origine Nucl6aire Haute Altitude＂）. Today, only conducted stresses are analyzed. An evolution is planned in 2013 to determine the equivalent vulnerability of radiated stresses and to validate the software.
基金Project(50674066)supported by the National Natural Science Foundation of China
文摘The solidified structures of horizontally continuous casting（HCC） of super-thin slab and its relations with the current were studied under the electromagnetic vibration（EMV）.The results show that,under the action of the periodical forces from EMV,the solidified structures of the super-thin slab of pure tin is greatly refined,and the extent of grain refinement is increased with the magnitude of alternating current.For the Sn-10%Pb alloy,it is shown that the EMV promotes the growth of equiaxed grains in the center of super-thin slab,and the grains are refined with the alternating current increasing.This is useful to prevent some solidification defects in the horizontally continuous casting of super-thin slab,such as columnar grains butting,porosity,inclusions and gases gathering,and composition segregation in the centre of slab.
文摘针对甚高频无线通信设备工作在高空电磁脉冲主要能量频谱范围内,生存能力受到严重威胁的问题,研究了甚高频无线通信系统的电磁脉冲易损特性,使用矩量法(method of moment,MoM)和CST软件分别求解了天线端口电流响应和舱体内耦合电场波形,确定了主要耦合通道和脉冲辐照试验等级。分别开展了天线和主机脉冲辐照试验,发现了脉冲冲击射频前端造成电源模块故障的“间接效应”现象。通过效应机理分析,确定了故障器件和失效原因。最后给出了防护建议:使用旁路泄放和稳态滤波的组合防护设计思路进行防护优化,要求防护器后端残余电流小于10 A。
