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이정환(Jung-Hwan Lee),윤홍우(Hong-Woo Yoon),유성열(Seong-Ryoul Ryoo),김종만(Jong-Man Kim),전지환(Ji-Hwan Jun),김철주(Chul-Ju Kim),서명원(Myung-Won Suh) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The purpose of this study is to investigate the cooling performance of heat sinks for telecommunication system by adequate natural convection. Heat generation rates of electronic components, temperature distributions of heat sinks and surrounding air are analyzed by experimental and numerical works. In order to perform the heat transfer analysis for the thermal design of telecommunication system, a program is developed. The program is capable of determining the arrangement of heat sources, interior fan capacity and configuration of the heat sink by graphic user interface environment. The simulation results indicate that a cooling capacity of up to 230W at a maximum temperature difference of 19℃ can be attainable. In order to verify the results from the numerical simulation, the experiment under the same condition is conducted, and their comparisons are made. Resulting, the design program can be a good tool to predict the effects of various parameters involved in the design of the heat sink for telecommunication system.
권기한(Gi-Han Kwon),김중욱(Joong-Wook Kim),윤홍우(Hong-Woo Yoon),박형건(Hyung-Gun Park) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.5
본 논문에서는 스마트무인기 콘솔구조의 설계개념을 소개하고, 장비의 안전성을 평가하기 위하여 충격과 진동에 대한 국방 환경시험규격을 적용하여 수치해석을 통한 주파수 응답스펙트럼을 분석하였다. 콘솔의 설계개념은 형상설계와 공학설계로 크게 분류된다. 형상설계는 콘솔의 운용성을 높이기 위한 인체공학규격을 기초로 하며, 공학설계는 충격과 진동에 대한 내구성을 높이기 위한 설계이다. 수치해석은 유한요소법을 통해 수행되었으며, 해석결과 콘솔에 설치된 6개의 탄성스프링은 충격과 진동에 대하여 충분한 감쇠를 보임이 확인되었다. This paper presents a design concept of smart UAV console system and the analysis of its dynamic response to shock and vibration. The console system design is determined by two main elements; the shape design and the mechanical design. The shape design refers to the human engineering aspects according to the military standards for ship borne equipment. The goal of the mechanical design is to provide the required shock and vibration endurance. The endurance of the system is numerically verified by means of Finite Element Method. The results of verification show that six resilient mounts installed on the console allow to sufficiently decrease the influence of the input impact wave on endurance of the system.
고장물리 기반 수중 매설형 PBA에 대한 신뢰성 설계 연구
김지영(Ji-Young Kim),이기원(Ki-Won Lee),윤홍우(Hong-Woo Yoon),이승진(Seung-Jin Lee),허준기(Jun-Ki Heo),권형안(Hyeong-Ahn Kwon) 한국신뢰성학회 2017 신뢰성응용연구 Vol.17 No.4
Purpose: PBA buried in underwater requires high reliability because of its mission critical characteristic and harsh operational environment during its life cycle. Therefore, various reliability improvement activities are necessary. The defect on PBA manufacturing process have been studied, as a result, many activities and standards have been presented. However, there are less studies regarding failure pattern on physical features based on design. In this paper, we studied a possible failure patten based on physical features that is related with manufacturing process of PBA. And reliability improvement design based on PoF (Physical of Failure) were intruduced in this paper . Methods: A reliability prediction simulation were performed on the components A and B of the H system using Sherlock Software which is a PoF commercial tool from DFR solution. Solder fatigue and PTH fatigue analysis based on thermal cycling profiles and random vibration was analyzed on three earthquake response spectrum. Result: It was validated that life time and reliability improvement design through solder fatigue and PTH fatigue analysis in case of component. For compoenet B, random vibration fatigue was additionally analyzed and validated reliability for earthquakes profile. Conclusion: In design stage prior to manufacturing, PoF can be analyzed, and it is possible to make a reliability improvement/validated design using design data. This study can be applied in every design step and contribute to make more stable development product.
광대역 수중 음향센서 구동 시스템 소형화를 위한 매칭용 변압기 활용 설계 방안
박상욱(Sang-Uk Park),이주찬(Ju-Chan Lee),윤홍우(Hong-Woo Yoon),안병선(Byoung-Sun Ahn),이승훈(Seung-Hun Lee),박재영(Jae-Young Park),목형수(Hyung-Soo Mok) 대한전기학회 2020 전기학회논문지 Vol.69 No.1
To drive the sonar sensor, it consists of a power converter that supplies power, a filter to attenuate harmonics of the power converter, and a matching transformer to attenuate the reactive components caused by the magnitude of the voltage and the structural characteristics of the sensor. In general sonar sensors, filters and matching transformers are designed based on one fundamental wave component to attenuate reactive components. However, sonar sensors in the operating frequency range have difficulty in selecting a standard in the design of a system for driving the same, and there is a problem of overdesigning the power converter more than necessary for the overall operation. In this paper, I propose a design standard for broadband sensors to solve these problems, and propose a method of volume reduction, one of the important factors for sensors mounted in a limited space.