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철도차량용 하이브리드 비접촉 제동장치의 dc 제동에 관한 연구
정환수(Hwan-Su Jung),한경희(Kyung-Hee Han),손원석(Won-Seok Son),이장무(Chang-Mu Lee),장길수(Gil-Soo Jang) 한국철도학회 2017 한국철도학회 학술발표대회논문집 Vol.2017 No.05
철도차량은 주로 공기제동 및 회생제동을 병행하여 제동력을 발생시키지만, 패드 및 디스크의 접촉으로 마모와 소음 문제가 발생하며 미세먼지를 증가시키는 것 뿐만 아니라 제동력이 변화하는 문제점을 지니고 있다. 문제점 개선을 위해 와전류 제동의 다양한 연구가 진행되어 오고 있다. 본 논문에서는 철도차량 제동 시에는 와전류 브레이크로서 동작하고, 운행 시에는 보조 동력원으로 동작할 수 있는 하이브리드 비접촉 제동기의 축소 모델을 제작하였으나 상이한 결과값의 문제점을 해결하기 위해 하이브리드 비접촉 제동의 다양한 요소 해석을 진행하고, 비교, 분석하여 dc 제동 특성에 대해 알아보고자 한다. Railway vehicles generate braking force primarily in combination with air brakes and regenerative braking, but contact with the pads and disks, they occurred a lack of wear and noise, as well as a change in braking force. Various studies have been conducted in order to improve the eddy current brake problems. In this paper, a miniature model of a hybrid non - contact brake that operates as an eddy current brake during rail vehicle braking and as an auxiliary power source during operation is produced. However, the results showed different values. In order to solve the problem, various elements of hybrid non-contacting brake were analyzed, and the dc braking characteristics were compared and analyzed.
폴리머 시멘트 슬러리 도장철근의 부착강도에 미치는 도장재 배합과 도장두께의 영향
조영국,박동열,장길수,Jo, Young-Kug,Park, Dong-Yeol,Jang, Gil-Su 대한건축학회 2011 대한건축학회논문집 Vol.27 No.6
In general, polymer cement slurry(PCS) that is made from organic polymer dispersion and cement has good adhesion to steel and cement concrete, waterproofness and acid resistance due to being of polymer films formed in cement slurry. The purpose of this study is to evaluate the effects of the mix proportions and coating thickness on the bond strength of coated rebar by PCS. The test pieces are prepared with two types of polymer dispersions such as St/BA and EVA, four polymer-cement ratios, two types of cement and four types of coating thickness, and tested for the bond strength test. From the test results, bond strength of PCS-coated rebar with St/BA and EVA is better than that of plain rebar and epoxy-coated rebar. In general, it is also high bond strength at polymer-cement ratios of 80% or more, and coating thickness of $100{\mu}m$. The maximum bond strength of PCS-coated rebar with ultra high-early strength cement and St/BA at polymer-cement ratio of 80%, and coating thickness of $100{\mu}m$ is about 1.5 and 1.6 times respectively, the strength of plain rebar and epoxy-coated rebar. It is apparent that the choice of polymer type, cement type, polymer-cement ratio and coating thickness is important to improve the bond strength of PCS-coated rebar to cement concrete.