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TETSUO KUBO,TOMOFUMI YAMAMOTO,KUNIHIKO SATO,MASAKAZU JIMBO,TETSUO IMAOKA,YOSHITO UMEKI 한국원자력학회 2014 Nuclear Engineering and Technology Vol.46 No.5
A feasibility study on the seismic design of nuclear reactor buildings with application of a seismic isolation systemis introduced. After the Hyogo-ken Nanbu earthquake in Japan of 1995, seismic isolation technologies have been widelyemployed for commercial buildings. Having become a mature technology, seismic isolation systems can be applied toNPP facilities in areas of high seismicity. Two reactor buildings are discussed, representing the PWR and BWR buildingsin Japan, and the application of seismic isolation systems is discussed. The isolation system employing rubber bearingswith a lead plug positioned (LRB) is examined. Through a series of seismic response analyses using the so-named standarddesign earthquake motions covering the design basis earthquake motions obtained for NPP sites in Japan, the responsesof the seismic isolated reactor buildings are evaluated. It is revealed that for the building structures examined herein: (1)the responses of both isolated buildings and isolating LRBs fulfill the specified design criteria; (2) the responses obtainedfor the isolating LRBs first reach the ultimate condition when intensity of motion is 2.0 to 2.5 times as large as that of thedesign-basis; and (3) the responses of isolated reactor building fall below the range of the prescribed criteria.
Kubo, Tetsuo,Yamamoto, Tomofumi,Sato, Kunihiko,Jimbo, Masakazu,Imaoka, Tetsuo,Umeki, Yoshito Korean Nuclear Society 2014 Nuclear Engineering and Technology Vol.46 No.5
A feasibility study on the seismic design of nuclear reactor buildings with application of a seismic isolation system is introduced. After the Hyogo-ken Nanbu earthquake in Japan of 1995, seismic isolation technologies have been widely employed for commercial buildings. Having become a mature technology, seismic isolation systems can be applied to NPP facilities in areas of high seismicity. Two reactor buildings are discussed, representing the PWR and BWR buildings in Japan, and the application of seismic isolation systems is discussed. The isolation system employing rubber bearings with a lead plug positioned (LRB) is examined. Through a series of seismic response analyses using the so-named standard design earthquake motions covering the design basis earthquake motions obtained for NPP sites in Japan, the responses of the seismic isolated reactor buildings are evaluated. It is revealed that for the building structures examined herein: (1) the responses of both isolated buildings and isolating LRBs fulfill the specified design criteria; (2) the responses obtained for the isolating LRBs first reach the ultimate condition when intensity of motion is 2.0 to 2.5 times as large as that of the design-basis; and (3) the responses of isolated reactor building fall below the range of the prescribed criteria.
Mechanical properties of bio-absorbable PLA/PGA fiber-reinforced composites
Tetsuo Takayama,Youhei Daigaku,Hiroshi Ito,Hideki Takamori 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.10
This study investigated important mechanical properties, the flexural strength and flexural modulus, of polyglycolic acid (PGA) fiberreinforcedpolylactic acid (PLA) composites fabricated by melt-mixing. The flexural strength and flexural modulus were estimated usingthree-point bending tests conducted at 37°C. Both the flexural strength and flexural modulus were increased by PGA fiber reinforcement. Viscoelastic properties were also investigated using dynamic mechanical analysis (DMA) under tensile loading. Results show that PGAfiber, which acts as the nucleate agent of PLA, restrains the molecular chains of PLA. That restraint reduces deformation at the samestress condition, thereby improving the PLA flexural properties.
FDT Technology for proprietary protocol field devices
Tetsuo Takeuchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We have developed communication and device DTMs for Yokogawa’s proprietary field communication protocol BRAIN. The BRAIN is analog based communication protocol like HART and has large install base in Japanese market. Using the both DTMs users can configure the BRAIN devices with FDT based software tool along with other protocol devices such as HART, PROFIBUS and FOUNDATON fieldbus..
Weld strength of short fiber reinforced polypropylene
Tetsuo Takayama 한국소성가공학회 2018 플라스틱가공 심포지엄(한일 공동 세미나) Vol.2018 No.8
The fiber content dependency on the weld strength of injection molded fiber reinforced polypropylene was investigated. It is suggested that there is a negative correlation between the fiber content and the weld strength. From experimental results, it is also clarified that weld strength of FRTP is determined by residual strain derived from thermal deformation during molding process and interaction force generated between fiber/matrix.