JT-60SA is a fully superconducting coil tokamak upgraded from the JT-60U. This paper focused on the integrity of the top lid of cryostat in JT-60SA. The design requirement for the cryostat in normal operations is to a...JT-60SA is a fully superconducting coil tokamak upgraded from the JT-60U. This paper focused on the integrity of the top lid of cryostat in JT-60SA. The design requirement for the cryostat in normal operations is to achieve vacuum insulation of 10-1 Pa, and the top flange of the top lid is lightly welded onto its body flange. The weld is tensile-loaded by bending deformation of the top lid due to vacuum pressure of external 0.1 MPa. This weld integrity is evaluated with tensile-load reduction, which results in clamp reinforcement. The structural integrity of the top lid is validated.展开更多
Thermal conductivity is an important quantity which represents the characteristic of Vacuum Insulation Panel’s(VIP’s)performance.Precise measurement of thermal conductivity provides better quality assurance for the ...Thermal conductivity is an important quantity which represents the characteristic of Vacuum Insulation Panel’s(VIP’s)performance.Precise measurement of thermal conductivity provides better quality assurance for the users.In this paper,we presented a novel embedded sensor method to measure the thermal conductivity of VIP.The proposed method evaluated the quality of VIP primarily based on the relationship between thermal conductivity and frequency characteristic of the output signal.In addition,we presented a new mean ridge regression extreme leaning machine(M-RRELM)model via improving extreme learning machine(ELM)by ridge regression to modify the relationship between the thermal conductivity and the output signal frequency characteristic.Experiments have shown that the M-RRELM model has higher precision compared with the traditional ELM.The proposed method achieved good performance and was faster than the well known methods.展开更多
文摘JT-60SA is a fully superconducting coil tokamak upgraded from the JT-60U. This paper focused on the integrity of the top lid of cryostat in JT-60SA. The design requirement for the cryostat in normal operations is to achieve vacuum insulation of 10-1 Pa, and the top flange of the top lid is lightly welded onto its body flange. The weld is tensile-loaded by bending deformation of the top lid due to vacuum pressure of external 0.1 MPa. This weld integrity is evaluated with tensile-load reduction, which results in clamp reinforcement. The structural integrity of the top lid is validated.
基金supported by the Science and Technology Projects of Fujian Province of China(Grant No.2010H6025)Science and Technology Projects of Xiamen City of China(Grant No.3502Z20103012)。
文摘Thermal conductivity is an important quantity which represents the characteristic of Vacuum Insulation Panel’s(VIP’s)performance.Precise measurement of thermal conductivity provides better quality assurance for the users.In this paper,we presented a novel embedded sensor method to measure the thermal conductivity of VIP.The proposed method evaluated the quality of VIP primarily based on the relationship between thermal conductivity and frequency characteristic of the output signal.In addition,we presented a new mean ridge regression extreme leaning machine(M-RRELM)model via improving extreme learning machine(ELM)by ridge regression to modify the relationship between the thermal conductivity and the output signal frequency characteristic.Experiments have shown that the M-RRELM model has higher precision compared with the traditional ELM.The proposed method achieved good performance and was faster than the well known methods.
