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차량용 에어필터 Sealing 및 상.하 Cap의 신기술 개발에 관한 연구
윤성운,김재열,Yoon, Sung-Un,Kim, Jae-Yeol 한국생산제조학회 2009 한국생산제조학회지 Vol.26 No.3
An air filter is a device to remove dust from the air supplied to the automotive engine. A requirement for the optimum air filter is to improve the capability to remove particles from the air it takes in, that is the efficiency and amount of dust collection. By removing dust from the air, the air filter prevents the engine cylinder from wear, reduces ventilation resistance, and thus improves engine output and guarantees intake performance. In order to guarantee such air filter performance, it is very important to properly seal the air filter. For passenger cars made in Korea, the air filters are fabricated with steel caps as their frames are large and their engine capacity is big. Recently however, European countries and Japan started using urethane for manufacturing the air filter, so that all foreign-made cars now have urethane filters. The urethanes used for air filters are applied in two ways: One is to use soft urethane for both top and bottom of the air filter and the other is to use soft urethane for the top and hard urethane for the bottom. Each of these method has unique problems. In this study, hard urethane is used for both top and bottom of the filter in order to improve those problems and increase the sealing efficiency. Especially for the top, NBR (rubber mold) is pre-settled in tough urethane and then the urethane is solidified through foaming, which makes it possible to develop a solid and double-sealed filter.
히트싱크의 핀 배열에 따른 냉각특성에 관한 실험적 연구
윤성운(Sung-Un Yoon),김재열(Jae-Yeol Kim),고가진(Jia-Chen Gao) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
In general, the operating temperature of electronic equipment is closely related to product life and reliability, and it is recognized that effectively cooling the parts is an important problem. In this paper, an experimental study on the cooling characteristic according to the pin array of the heat sink is conducted. The experiment on the heat sink was based on the natural convection and temperature distribution changes. The experimental results indicate that the pin array of the heat sink has an effect on the thermoelectric module’s cooling characteristic.
초음파 서모그래피를 적용한 가솔린 엔진 피스톤 균열에 대한 비파괴 신뢰성평가
김성현(Sung-Hyun Kim),양용하(Yong-Ha Yang),최승현(Seung-Hyun Choi),김재열(Jae-Yeol Kim),윤성운(Yoon-Sung Un) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
Ultrasound thermography detects defects by radiating 20-30 ㎑ ultrasound waves to the samples and capturing the heat generated from the defects with the use of an infrared thermographic camera. This technology is being spotlighted as a next-generation NDT technique for the automobile and aerospace industries because it can test large areas and can detect defects such as cracks and exfoliations in real time. The heating mechanism of the ultrasound vibration has not been accurately determined, but the thermomechanical coupling effect and the surface or internal friction are estimated to be the main causes. When this heat is captured by an infrared thermographic camera, the defects inside or on the surface of objects can be quickly detected. Although this technology can construct a testing device relatively simply and can detect defects within a short time, there are no reliable data about the factors related to its detection ability. In this study, the ultrasound thermography technique was used to manufacture gasoline engine piston specimens, and nondestructive reliability tests to verify the applicability and validity of the ultrasound thermography technique.
Stability Analysis and Ultra-Precision Positioning for UPCU
Jae-Yeol Kim(김재열),Sung-Un Yoon(윤성운),Jong-Hoon Jang(장종훈),You-Hong Kim(김유홍),Choul-jun Choi(최철준),Woo-Jin Kim(김우진) 한국생산제조학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
The world, coming into the 21st century, is preparing a new revolution called a knowledge-based society after the industrial society. The interest of the world is concentrated on information technology, nano-technology and biotechnology. In particular, the nano-technology of which study was originally started from an alternative for overcoming semiconductor micro-technology. It can be applied to most industry subject such as electronics, information and communication, machinery, chemistry, bioengineering, energy, etc. They are emerging into the technology that can change civilization of human beings. Specially, ultra precision machining is quickly applied to nano-technology in the field of machinery. Lately, with rapid development of electronics industry and optic industry, there are needs for super precision finishing of various core parts required in such related apparatuses. This paper handles stability of a super precision micro cutting machine that is a core unit of such a super precision finisher, and analyzes the results depending on the hinge type and material change, using FEM analysis. By reviewing the stability, it is possible to achieve the effect of basic data collection for unit control and to reduce trials and errors in unit design and manufacturing.
김재열(Jae-Yeol Kim),윤성운(Sung-Un Yoon),홍성훈(Sung-Hoon Hong),유홍연(Hong-Yeon Yoo),김창현(Chang-Hyun Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
Availability of defect test algorithm that recognizes exact and standardized defect information in order to fundamentally resolve generated defects in industrial sites by giving artificial intelligence to SAT(Scanning Acoustic Tomograph), which previously depended on operator’s decision, to find various defect information in a semiconductor package, to decide defect pattern, to reduce personal errors and then to standardize the test process was verified. In order to apply the algorithm to the lately emerging Neural Network theory, various weights were used to derive results for performance advancement plans of the defect test algorithm that promises excellent field applicability.