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장영도(Young Do Jang),이배섭(Bae Sub Lee) 산업기술교육훈련학회 2016 산업기술연구논문지 (JITR) Vol.21 No.3
In this study, TV ATCA(Automatic Tape Cutting Connector) has been developed for a Television. A benchmarking study for Computer Connector and Smart phone Connector has been carried out A test Machine for TV ATCA has been developed and applied to the developed sample. In the test results of comparing the developed sample with the Handle, three major characteristics- the working time, workflow and incomes - are in the range of the intended target. A practical process for the evolution design is proposed. As the development of the new equipment, the operation times has been shortened from 15 seconds to 2.5 seconds, and precision was improved 0.05mm to 0.3mm.
유효낙차에 따른 80kW급 횡류수차의 성능 및 내부유동 해석
최영도,임재익,이영호,Choi, Young-Do,Lim, Jae-Ik,Lee, Young-Ho 한국마린엔지니어링학회 2010 한국마린엔지니어링학회지 Vol.34 No.5
Recently, small hydropower attracts attention because of its clean, renewable and abundant energy resources to develop. However, suitable turbine type is not determined yet in the range of small hydropower and it is necessary to study for the effective turbine type. Therefore, a 80kW-Class cross-flow turbine is adopted in this study because of its simple structure and high possibility of applying to small hydropower. The result shows that as effective head increases, tangential and radial flow velocities increase and thus, the increased tangential velocity contributes to the increase of angular momentum and output torque. 최근 신재생에너지 연구개발과 관련하여 소수력발전에 대한 관심이 높아지고 있지만, 기존의 대수력용 수차 시스템과는 달리 소수력에 적당한 수차의 설계법이 아직 확립되어 있지 않기 때문에 고성능의 소수력용 수차의 개발이 요구되고 있다. 그러나, 복잡한 터빈의 구조에 의한 상대적으로 높은 제작단가는 소수력발전용 터빈의 개발에 큰 걸림돌로 작용하고 있다. 따라서, 본 연구에서는 수차의 형상이 상대적으로 간단하고 소수력자원에 적용하기가 용이한 80kW급 횡류형 수차에 대하여 유효낙차 변화에 따른 성능 및 내부유동에 대해서 검토하였다. 유효낙차가 증가함에 따라서 원주방향 및 반경방향 속도비가 증가하게 되며, 증가한 원주속도에 의해 각운동량이 증가하여 출력도 커지게 된다.
최영도,김유택,이영호,Choi, Young-Do,Kim, You-Taek,Lee, Young-Ho 한국마린엔지니어링학회 2007 한국마린엔지니어링학회지 Vol.31 No.6
It has been known that one of the main obstacles of improving the performance of positive displacement hydraulic turbine is pressure pulsation which occurs at the regions upstream and downstream of the turbine. In order to suppress the pressure pulsation. occurrence reason of the pressure pulsation should be understood in detail Therefore. this study aims to establish a CFD analysis method by which the phenomena of unsteady pressure pulsation can be examined with high accuracy. Internal flow field of the turbine is modeled simply to generalize the relation between the pressure pulsation and internal flow. The results show that the Present CFD method adopting unsteady calculation can be applied successfully to the analysis of the Phenomena of Pressure Pulsation. Occurrence of the Pressure pulsation is due to the difference of the rotational speed of turbine rotors When driving rotor rotates by uniform speed and fellowing rotor rotates by variable speed, very large Pressure pulsation occurs within the turbine periodically.