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유성연,주병수,이상윤,박종학,Yu, Seong-Yeon,Ju, Byeong-Su,Lee, Sang-Yun,Park, Jong-Hak 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.8
Effect of vortex generator on the heat transfer enhancement of electronic chips is investigated using naphthalene sublimation technique. Experiments are performed for a single chip and chip arrays, and shape of vortex generator, position of vortex generator, stream wise chip spacing and air velocity are varied. Local and average heat transfer coefficients are measured on the top surface of simulated electronic chips, and compared with those obtained without vortex generator. In case of a single chip, heat transfer augmentation is seen only on the upstream portion of chip surface, while heat transfer enhancement is found on the whole surface for chip arrays. Rectangular wing type vortex generator is found to be more effective than delta wing.
김명수 ( Myung Soo Kim ),오근태 ( Geun Tae Oh ),주병수 ( Byeong Su Ju ) 대한설비관리학회 2016 대한설비관리학회지 Vol.21 No.1
LNG-FPSO(Liquefied Natural Gas-Floating Production, Storage and Offloading) is a floating vessel used by the offshore oil and gas industry for the production, processing, storage, and offloading of LNG. Since the overall production availability of an LNG plant is a major criterion for economic evaluation, it is important to have an estimation of its availability. This paper is concerned with the RAM(reliability, availability and maintainability) analysis for an LNG-FPSO gas compressor. The reliability block diagram(RBD) of the compressor is constructed by functional analysis, where the system hierarchy is classified as subunit and maintainable item. The failure rate and MTTR(mean time to repair) of maintainable items are estimated from OREDA(Offshore and Onshore Reliability Data). The failure rate and MTTR of the subunit, and the availability, failure rate and MTTR of the compressor are estimated by the PTC Windchill Quality Solution.
김명수 ( Myung-soo Kim ),오근태 ( Geun-tae Oh ),주병수 ( Byeong-su Ju ) 대한설비관리학회 2016 대한설비관리학회지 Vol.21 No.3
Field service data is a category of data that is connected with field service calls where a repair technician manually repairs a failed product during an on-site visit. This is a potentially powerful source of field reliability information, as long as a system is in place to gather the necessary data during the service call. This paper presents the field data analysis of a turbo compressor. The failure rates of maintainable items and compressor system are estimated by analyzing the field data collected from the 282 systems shipped in the market from 2008 to 2016. They are also compared with the failure rates estimated by using OREDA(Offshore and Onshore Reliability Data).