在倒装芯片的单粒子效应防护设计验证中,重离子在到达器件敏感区前要经过几百微米的衬底材料,需要计算器件敏感区中离子的线性能量传输(LET)值。采用兰州重离子加速器加速的55 Me V/μ58Ni离子对基于倒装的Xilinx公司550万门现场可编程...在倒装芯片的单粒子效应防护设计验证中,重离子在到达器件敏感区前要经过几百微米的衬底材料,需要计算器件敏感区中离子的线性能量传输(LET)值。采用兰州重离子加速器加速的55 Me V/μ58Ni离子对基于倒装的Xilinx公司550万门现场可编程门阵列(FPGA)实现的典型系统的单粒子效应防护设计进行了试验验证,采用SRIM、FLUKA和GEANT等不同方法对试验中的LET值进行了分析,同时将SRIM分析的典型结果与基于磁偏转飞行时间法的试验数据进行了比较,发现与现有的重离子分析结果有一定差异。因此在防护验证中采用离子LET作为主要参数的情况下,应对重离子(尤其是高能段)的LET的计算方法进行约定,以规范试验过程,增强数据的可比性。展开更多
In order to study the mechanical performance of a new type of cable-stayed beam-arch combination bridge, the results of field static and dynamic load tests are comparatively analyzed with numerical results based on th...In order to study the mechanical performance of a new type of cable-stayed beam-arch combination bridge, the results of field static and dynamic load tests are comparatively analyzed with numerical results based on the Jingyi bridge straddling the Daxi River in Yixing. First, the test scheme, tasks, the corresponding measure method, as well as the relevant codes are described. Secondly, two sets of three- dimensional finite element models are established. One is Ansys which uses the solid element and the other is Midas which adopts the beam element. Finally, the experimental and analytical results are comparatively analyzed, and they show an agreement with each other. The results show that the bridge possesses adequate load-carrying capacity under all static load cases, but the capacity of dissipating external input energy is insufficient due to the relatively smaller damping ratio. The study results can provide a reference for further study and optimization of this type of bridge. Calibrated finite-element models that reflect the real conditions can be used as a baseline for future maintenance of the bridge.展开更多
文摘在倒装芯片的单粒子效应防护设计验证中,重离子在到达器件敏感区前要经过几百微米的衬底材料,需要计算器件敏感区中离子的线性能量传输(LET)值。采用兰州重离子加速器加速的55 Me V/μ58Ni离子对基于倒装的Xilinx公司550万门现场可编程门阵列(FPGA)实现的典型系统的单粒子效应防护设计进行了试验验证,采用SRIM、FLUKA和GEANT等不同方法对试验中的LET值进行了分析,同时将SRIM分析的典型结果与基于磁偏转飞行时间法的试验数据进行了比较,发现与现有的重离子分析结果有一定差异。因此在防护验证中采用离子LET作为主要参数的情况下,应对重离子(尤其是高能段)的LET的计算方法进行约定,以规范试验过程,增强数据的可比性。
文摘In order to study the mechanical performance of a new type of cable-stayed beam-arch combination bridge, the results of field static and dynamic load tests are comparatively analyzed with numerical results based on the Jingyi bridge straddling the Daxi River in Yixing. First, the test scheme, tasks, the corresponding measure method, as well as the relevant codes are described. Secondly, two sets of three- dimensional finite element models are established. One is Ansys which uses the solid element and the other is Midas which adopts the beam element. Finally, the experimental and analytical results are comparatively analyzed, and they show an agreement with each other. The results show that the bridge possesses adequate load-carrying capacity under all static load cases, but the capacity of dissipating external input energy is insufficient due to the relatively smaller damping ratio. The study results can provide a reference for further study and optimization of this type of bridge. Calibrated finite-element models that reflect the real conditions can be used as a baseline for future maintenance of the bridge.
