• Title/Summary/Keyword: 미세엔진

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Development of a purifying system to separate minute solid particles and water in oil (오일 속 미세입자 및 수분분리를 위한 청정기 시스템 개발)

  • Kim, Yong-Keun;Choi, Yoon-Hwan;Moon, Myung-Jun;Lee, Yeon-Won
    • Journal of Advanced Marine Engineering and Technology
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    • v.41 no.1
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    • pp.44-49
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    • 2017
  • In this research, a purifying system using a centrifugal filter equipped with a water separation component has been studied. Oil utilized for lubrication and cooling in marine engines becomes unable to achieve its original purpose over time as the accumulation of solid particles and water increases. Therefore, methods applying the Bernoulli equation to eliminate water in oil were investigated and proposed. As a result, a practical purifying system was designed and tested by an officially certified organization. The new purifying system is anticipated to contribute to the extension of the lifetime of oil in addition to damage reduction methods of mechanical parts.

Design and Manufacture Hybrid Rocket for Measuring Atmospheric Fine Dust (대기 중 미세먼지 농도 측정을 위한 하이브리드 로켓 설계 및 제작)

  • Park, Yeong-Hun;Kim, Gi-Mun;Lee, Dong-Wan;Mun, Hui-Jang;Kim, Jin-Gon
    • 한국항공운항학회:학술대회논문집
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    • 2015.11a
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    • pp.13-19
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    • 2015
  • 본 연구의 목적은 자체 설계 제작한 하이브리드 발사체를 이용하여 대기 중의 미세먼지를 측정하는데 있다. 대기 중의 미세먼지를 측정하기 위한 방법으로는 중량농도법을 이용하였으며, 미세먼지 측정을 위한 포집장치를 자체 제작하였다. 엔진은 5port의 HDPE(High Density Polyethylene)를 연료 그레인으로 사용하였고 $LN_2O$(Liquefied Nitrous Oxide)를 산화제로 사용하였다. 압력, 가속도, GPS 등을 수집하며, 하이브리드 발사체의 동체는 FRP(Fiberglass Reinforced Plastics)로 제작한다. 전체 비행시간은 총 95초로 예상되며. 연소시간은 3초, 고도는 800 m 이다.

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A study on the Development of CNC Lathe for Noncircular Cutting (비진원 가공용 CNC 선반 개발에 관한 연구)

  • 김경석;양승필;김성식;정현철;김정호;이도윤
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.45-51
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    • 1995
  • 자동차 엔진의 피스톤은 핀 구멍의 복잡한 형상과 2사이클 엔진의 경우 실린더쪽 흡기 및 배기 포트의 위치에 따라 균일하지 않은 열이나 응력 등의 영향에 의한 변형을 고려하여, 상온에서의 형상이 각종 평가 시험을 거쳐 엔진마다 다양한 형상을 갖는 피스톤으로 결정된다. 본 연구에서는 컴퓨터 제어에 의한 방법으로서 타원형상을 갖는 임의의 피스톤을 고속, 고정도로 가공할 수 있는 CNC(Computer Numerical Control)선반 개발에 관하여 연구 하였다. 피스톤 데이터를 퍼스널 컴퓨터로 입력하고 CNC 제어하므로 마스터캠의 제작 불필요, Recess 등과 같은 미세가공 가능, 피스톤의 형상변경 용이, 고속가공 등으로 모방절삭 방식보다 훨씬 높은 생산성 향상이 기대된다.

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High Density Energy Welding of Gas Turbine Alloys

  • Kim, Hwan-Tae
    • Proceedings of the KWS Conference
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    • 2001.10a
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    • pp.140-142
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    • 2001
  • 항공기의 제트 엔진을 비롯하여 육상용 발전기, 선박용 엔진, 로켓 엔진 등에 널리 사용되는 터빈 블레이드를 포함한 고온용 가스터빈 부품은 최대 온도 120$0^{\circ}C$ 이상의 고온에 노출되어 가혹한 기계적 응력을 받는 동시에 고온에서의 표면 안정성이 요구되므로 초내열 니켈 합금(superalloy), 티타늄 합금, 내열강 등의 고온강도가 우수한 합금이 사용된다. 그런데 합금성분이 많이 첨가된 내열 합금을 용접하는 경우, 미세균열, 용접부의 기계적 성질의 저하, 용접열영향부의 내식성과 내산화성의 저하, 용접외부 결함에 의한 피로강도 저하 등의 문제가 발생하므로 이를 해결해야 한다. 본고에서는 생산성과 용접품질이 우수한 고밀도 에너지빔 용접의 적용 현황에 관하여 고찰코자 한다.

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A Study on the Structural Integrity Considering the Installation of a Micro-tube Heat Exchanger (미세튜브 열교환기의 장착을 고려한 구조건전성에 관한 연구)

  • Oh, Se Yun;Kim, Tae Jin;Cho, Jong Rae;Jeong, Ho Sung
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.39 no.4
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    • pp.447-451
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    • 2015
  • The objective of this study is to predict the structural characteristics of a heat exchanger mounted on an aircraft engine using finite element analysis. The plastic fracture and life of the heat exchanger were estimated by a thermo-mechanical analysis. Tensile tests were conducted under high temperature conditions (700, 800, 900, 1000 K) using five specimens to obtain the mechanical properties of the Inconel 625 tubes. To assess the structural characteristics of the heat exchanger, the full and partial models were applied under the operating conditions given by the thermo-mechanical and inertial load. As a result, the case, tubesheet, flange, and mounting components have a reasonable safety margin to the allowable stress assuming a fatigue strength of Inconel 625 of 10000 cycles under 1000 K.

A Study on Friction Loss of Engine using Microfluidics Approach (미세유동의 경계면 특성을 적용한 엔진 마찰 손실 연구)

  • Park, Cho Hee;Kim, Bo Hung
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.38 no.12
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    • pp.1035-1042
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    • 2014
  • Reducing the friction of engine parts is an important issue in engine design. The loss of energy in the piston assembly due to mechanical friction ranges from 40 to 55%, and there is an increase in the total energy of about 5% if the friction of the piston can be removed. In order to reduce the friction loss at the level of each engine part, it is necessary to perform a comparative analysis with other engines to determine the important factors affecting the energy loss. Several studies have been performed to analyze the lubrication based on hydrodynamic modeling, since a piston lubrication system has dimensions in the nanoscale to microscale domain. Therefore, it is necessary to determine the correlations between the molecular and continuum systems. In this study, we investigated the friction changes due to the various interactions between molecules in the wall/fluid interface, where a microscopic movement of the oil film occurs along the cylinder liner of the engine.

Development of Icing Simulation Device for Gas Turbine Icing Test (가스터빈 결빙시험용 결빙모사장치 개발)

  • Lee, Gyeong-Jae;Lee, Jin-Geun;Go, Seong-Hui;Jeon, Yong-Min;Yang, Su-Seok;Lee, Dae-Seong
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.37-46
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    • 2006
  • The outside environment is very severe while aircraft is cruising. Especially small particle of icing in cold air condition can have negative influence on aircraft performance. If ice particle is attached to leading edge of wing, it can change wing configuration and decrease flight quality. If icing particle is attached to inlet of engine, it can damage compressor blade and have negative influence to aircraft safety. We make icing simulation device with liquid air system for analyzing about variation of engine performance due to incoming of icing to engine.

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Design and Fabrication of Micro Combustor (III) - Fabrication of Micro Engine by Photosensitive Class - (미세 연소기 개발 (III) - 감광 유리를 이용한 마이크로 엔진의 제작 -)

  • Lee, Dae-Hoon;Park, Dae-Eun;Yoon, Joon-Bo;Yoon, Eui-Sik;Kwon, Se-Jin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.26 no.12
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    • pp.1639-1645
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    • 2002
  • Micro engine that includes Micro scale combustor is fabricated. Design target was focused on the observation of combustion driven actuation in MEMS scale. Combustor design parameters are somewhat less than the size recommended by feasibility test. The engine structure is fabricated by isotropic etching of the photosensitive glass wafers. Electrode formed by electroplating of the Nickel. Photosensitive glass can be etched isotropically with almost vertical angle. Bonding and assembly of structured photosensitive glass wafer form the engine. Combustor size was determined to be 1 mm scale. Movable piston is engraved inside the wafer. Ignition was done by nickel spark plug which was electroplated with thickness of 40 ${\mu}{\textrm}{m}$. The wafers were bonded by epoxy that resists high temperature. In firing test due to the bonding method and design tolerance pressure buildup by reaction was not confirmed. But ignition, flame propagation and actuation of micro structure from the reaction was observed. From the result basement of design and fabrication technology was obtained.

Study on the Combined Melt Treatment to optimize Al-Si-Cast Alloys

  • Muller, Katrin;Bae, Seok-Choun;Lee, Han-Young
    • Journal of Korea Foundry Society
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    • v.23 no.4
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    • pp.179-186
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    • 2003
  • 공정계 및 공정계 조성에 가까운 주조용 AISi합금은 자동차엔진 생산분야 등에서 광범위하게 사용되고 있다. 일반적으로 AISi합금은 적용 분야에 따른 다양한 요구조건을 충족시키기 위하여 공정 조직 내 Si lamellar 상의 개량을 목적으로 종종 열처리를 행하나, 그들의 기계적 성질은 주로 응고 기간 중의 주조 조직 변화에 의해 결정되어진다. 본 연구는 1차 정출상들에 대한 미세화 첨가원소와 공정조직 내 Si의 형상 및 결정입 사이에서 나타날 수 있는 상호 작용에 대하여 관찰하였으며, 특히 AISi9 및 AISi14 합금에서의 인장 및 마모 특성은 물론 그들의 미세 조직 변화에 대한 P와 Sr의 동시 첨가 효과에 대하여 조사하였다. 동시 첨가한 경우 공정 조직 내 Si의 개량화는 물론 1차 정출상의 미세화를 통하여 단일 첨가에 비하여 상기 합금의 인장 및 마모 특성을 동시에 증가시켰다.

A Study on the Prediction of Storage Life of Rolling Element Bearings for the Single-use Turbo Engine (일회성 터보엔진용 구름 베어링의 저장 수명 예측에 관한 연구)

  • Sun Je Kim;Dong Min Kim;Soon Ho Hong;Seong Ki Min
    • Journal of the Korean Society of Propulsion Engineers
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    • v.26 no.6
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    • pp.43-52
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    • 2022
  • Operational reliability of the single-use turbo engine for guided weapons must be guaranteed even after long-term storage. Rolling element bearings have a great influence on the operational reliability of the turbo engine, however changes in micro dimensions of bearings by an oxide layers on rolling elements and raceways may cause failures after long-term storage. In this study, changes in dimensions of bearings were measured and roughness of rolling elements was used for estimating the storage life. Storage life estimation was performed via two kinds of methods, Weibayes method and random sample generation method. The results of two methods were compared and their characteristics were analyzed. This study will contribute to establish an efficient maintenance schedule for the single-use turbo engine.