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해수환경하에서 나노복합재료(Epoxy/MWCNTs)로 coating한 마그네슘합금(AM50)에 대한 부식평가
조일민(Il Min Jo),정도연(Do Yeon Jung),김철인(Chul In Kim),심충무(Choong Moo Shim),김연직(Yon Jig Kim),임재규(Jae Kyoo Lim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Mg and its alloys have attracted a lot of attention in many different sectors of engineering application such as automotive, aircraft, electronics, handled or household industry field. These are due to lightweight and superior specific strength of magnesium alloy. However, the low corrosion resistance of Mg alloys make it difficult to apply in many engineering application. The present investigation evaluates nanocomposite layers which were prepared by adding a multi walled carbon nanotubes (MWCNTs) to an epoxy resin aiming to study the resulting corrosion mechanism and corrosion performance of Mg alloy AM50. The pure polymer layer was investigated and compared between the nanocomposites containing CNTs. Distribution behavior of carbon nanotubes in the epoxy matrix was examined through forced scanning electron microscopy (FE-SEM). The results demonstrated that, the CNTs demonstrated a good dispersion inside the polymer matrix. Both nanocomposite and pure coated samples showed subsequently good adhesive properties to resist aggressive corrosion under seawater environment for a long period.
유체 토크 컨버터를 이용한 정회전 정출력 풍력발전시스템 연구 및 개발
이인열(In-Yol Yi),이강일(Kang-Il Lee),심충무(Choong-Moo Shim),최대규(Dae-Kue Choi),임재규(Jae-Kyoo Lim) 한국조명·전기설비학회 2012 조명·전기설비학회논문지 Vol.26 No.11
Most of existing wind turbine system is used with geared type; however, this type has lots of problems which are noisy, weight, maintenance and so on. In this paper, wind turbine system with fluid torque converter applied to solve these problems. In case of the proposed wind turbine system, it is possible to transmit torque to adaptable distance. So various sets including generator, inverter and auxiliary motor move from the nacelle to the ground. As a result, Total weight in Nacelle can be decreased. however, the efficiency can be decreased with fluid tourque system.. We also applied auxiliary motor to fluid touque system . So, we also realized rated revolutions and rated output windturbine and could get considerable good data.