5톤 송풍기용 FAN 인양기 구조설계

이형욱,이광희,Lee, Hyoungwook,Lee, Gwanghee 한국교통대학교 융복합기술연구소 2019 융ㆍ복합기술연구소 논문집 Vol.9 No.1

Normal cranes cannot be used to move the fan inside the high-rise factories. Due to the size of the fan and safety accidents, there is a need for a structure capable of lifting and transporting. In this study, the safety of the structure was evaluated by considering the center of gravity of the fan and the effect of the fan being tilted up. An analysis of the buckling was performed by hand calculation. Nonlinear analysis was performed using ABAQUS to evaluate the safety of the structure. The safety factor for buckling is above 4.0 and the safety factor for stress is calculated to be 1.31 under the worst load distribution conditions.

비원형 단면을 갖는 금형스프링의 단면설계

이형욱,최화룡,Lee, Hyoungwook,Choi, Hwaryong 한국교통대학교 융복합기술연구소 2011 융ㆍ복합기술연구소 논문집 Vol.1 No.1

The purposes of this study are predictions of the changes in the section geometry and determination of the initial cross section so that opposite side in height direction is exactly parallel after coiling process. Finite element analysis is carried out for the calculation of the sectional changes for mold spring item. Analysis results reveal that the slope of the top and bottom sides varies in the range of 5 to 8 degrees and the amount depends on the dimension of the outer diameter. The slopes of the sides should be defined first among design variables.

동력기반 기계부품 산업 현황 분석 및 지원방안 - 충북지역을 중심으로

이형욱,배성민,Lee, Hyoungwook,Bae, SungMin 한국교통대학교 융복합기술연구소 2016 융ㆍ복합기술연구소 논문집 Vol.6 No.1

In recent years, manufacturing industry takes a lot of significant change - such as Industry4.0, SMART factory, and IoT(Internet of things). To satisfy their requirements, many cutting-edge machineries are provided to enhance manufacturing industry's productivity. Also, IT technologies are applied to many machinery part and improve their functions. In Korea, Chung-buk plays an important role in machinery part industry. In this paper, we survey, analyze and summarize the current machinery part industry focused on Chunk-buk Area.

균등 압력이 부과된 원형판의 변형에 대한 해석요소의 정확성 비교

이형욱,Lee, Hyoungwook 한국교통대학교 융복합기술연구소 2016 융ㆍ복합기술연구소 논문집 Vol.6 No.1

The analysis of circular plates under the constant pressure are simplified as the loading conditions of the circular manhole. The theoretical solution of circular plates with respect to the constant pressures are derived by using the governing equation of plate deflection. The deflection and the radial stress distributions were calculated by the theory. Finite element solutions were conducted with respect to the element types of the continuum elements. The most accurate element was selected by comparisons of the theoretical solutions and simulated solutions. The C3D8I element type in brick-type continuum elements gave in a good accordance with the theoretical solutions.

승용차용 에어스프링에서의 보강섬유 압축 파손 분석

이형욱(Hyoungwook Lee),김진영(Jinyoung Kim),박진용(Jinyong Park) 한국자동차공학회 2016 한국자동차공학회 지부 학술대회 논문집 Vol.2016 No.5

소재변경에 따른 차량용 스크롤압축기의 열변형 해석

이형욱(Lee Hyoungwook),이근안(Lee Geunan),김정배(Kim Jeongbae) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.6

An inverter scroll compressor is used for the air conditioning in cars. Scrolls would be changed from the aluminum material to the magnesium material in order to satisfy the light weight trends of cars. The material changing influences on the scroll dimensions particularly the gap between two scrolls. Since the larger gap declines the performance of the compression, the gap between wraps of scrolls or the gap between wraps of scrolls to the plate of the opposite scroll is regarded as an important design variable. This paper is focused on the effects of the thermal stress due to the materials changing. The temperature difference between the inlet and the outlet is about 60 degrees and the highest operating temperature in the compressor is less than 110 degrees. The level of thermal stresses in the magnesium scroll is less than the result from aluminum one. The trend of the deformation is revealed that the normal directional deformation is 2 times lager than the in-plane directional deformation. Therefore the gap between the top of the wrap to the plate of the opposite scroll become more important than the other gaps. The orbiting scroll deforms larger than the fixed scroll by the thermal stresses. The deformation of the magnesium scroll is about 10% lager than that of the aluminum scroll. This value is similar to the ratio of the coefficients of thermal expansion of two materials. At the initial design stage, the results give many useful guides to engineers to propose gaps between parts.

3D 프린팅과 구조해석을 이용한 맨홀의 부양장치 설계 및 제작

이형욱(Hyoungwook Lee) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.10

본 노면에 설치되어있는 맨홀의지속적인 관리를 위해서는 맨홀의 개폐가 쉬워야한다. 가혹한 조건하에있는맨홀은 틀과 커버가 고착되어 개폐가 어렵기 때문에 맨홀을 열 때 부양이 가능한 맨홀이 요구된다. 본 연구에서는 잠금식 맨홀을 부양식 맨홀로 개선하기 위한 부양 기구의 설계를 진행하였다. 잠금식 맨홀의 기구는 중앙에 위치한 볼트를 돌리면 볼트와 연결된 허브가 하강하고, 허브와 연결되어 있는 후크를 회전시키게 된다. 후크의 끝단이 맨홀 틀에 걸리도록 되어있다. 본 연구에서는 맨홀의 부양이 가능하도록 후크에 보조장치를 설치하도록 하였다. 부양 기능을 수행할 후크의 항복응력의 70%를 기준으로 약 300kg의 부양력을 지지할 수 있도록 구조를 설계하였다. 유한요소법을 이용한 구조해석을 통하여 형상 설계를 수행하였다. 우선 단순화된 2차원 모델로 1차 기초설계를 수행하고, 3차원 모델을 통하여 부착위치와 형상을 설계하였다. 설계된 형상에 대하여 구조적 문제점을 찾아보기 위하여 3D 프린팅을 통하여 축소 모델을 출력하였고, 기능이 작동함을 확인하였다. 최종적으로 가공을 통하여 부양 기구를 제작하여 기존의 잠금식 맨홀에 적용한 결과 평균 6.1 mm 정도의 부양이 가능함을 확인하였다. In order to maintain manholes installed on the road, the manhole should be easy to open and close. Manhole covers under harsh conditions require that they can be lifted when attempting to open the manhole because the frame and cover are stuck and difficult to open and close. In this study, the design of a lifting mechanism was carried out to improve and integrate the locking type manhole. The mechanism of the locking manhole is that when the bolt located at the center is turned, the hub connected with the bolt descends, and the hook connected to the hub is rotated. The end of the hook is hooked to the manhole frame. The auxiliary device was installed on the hook so that the manhole cover can be lifted. The structure was designed to endure about 300kg of lifting force based on 70% of the yield stress of the hook to perform lifting function. The shape design was performed through the structural analysis using the finite element method. First, the basic design was performed with the simplified 2-dimensional model and the attachment position and shape were designed through the 3-dimensional model. In order to find out the structural problems of the designed shape, the scale downed model was fabricated through 3D printing and confirmed that the lifting function worked. Finally, it was confirmed that both the locking and the average lifting of about 6.1 mm can be done by applying the lifting mechanism through the machining and applying it to the existing locking manhole.

유한요소법과 반응표면법을 이용한 경량 맨홀 커버 구조 최적화 설계

이형욱(Hyoungwook Lee) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.6

The locking load of a conventional manhole depends on the weight of its cover. Locking-type manhole structures with a special locking mechanism were recently developed to prevent accidents such as stolen cover, away cover from a frame. The weight of the manhole structure can be reduced under structural safety because the locking force of a locking-type manhole is greater than the weight of the cover. A light-weight manhole cover is developed in this study by using a finite element stress analysis and the design of experiments. Static stress analysis and fracture experiments are also conducted to analyze the states of the initial product. The optimum light-weight manhole cover considering manufacturing molds is developed and tested. Consequently, the weight was found to reduce by 16%. In addition, the fracture load increased by 38%.

충북 수송기계소재부품산업 통계분석을 통한 기업지원영역 연구

이형욱(Hyoungwook Lee),박성준(Sung-Jun Park) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.8

본 2018년 충청북도의 주력산업은 스마트 IT 부품, 바이오 헬스, 수송기계 소재부품 산업이다. 수송기계 소재부품산업은 기계 분야에서 미래형 수송 수단 관련 친환경 및 지능형 핵심 원천기술에 해당한다. 이 산업을 육성하기 위하여 기업지원 사업이 진행되고 있다. 본 연구에서는 기업지원 중 기술지원 사업의 대상과 방향을 설정하기 위하여 충북지역의 해당기업의 업체 수, 종업원 수, 출하액, 부가가치 액을 수송기계 소재부품 산업의 전방 산업과 후방 산업으로 구분하여 분석하였다. 특히 50인 미만의 중소기업체에 대하여 기업의 창설이후 업력에 따른 업체 당 부가가치 변화를 분석하여 지원 대상 기업군을 설정하였다. 후방 산업의 경우, 창업 3년 이내의 업체의 부가가치 액은 연도 별로 점점 낮아지고 있어 창업 초기에 기술지원이 필요하다. 5~9년 사이의 업체는 연도 별로 극심한 변화 추세를 보이고 있어 사업 다각화 또는 신규 아이템 발굴을 위한 지원이 필요한 것으로 판단된다. The main industries in Chungcheongbuk-do are the smart IT parts; bio-health; and transportation machinery, materials and parts. The transportation, machinery, materials and parts (TMMP) industry is a key source technology for environmentally friendly and intelligent vehicles related to future vehicles in the machinery sector. Business support projects to improve this industry are currently underway. In this study, the number of enterprises, number of employees, amount of shipment, and added value of the enterprises in Chungbuk area were analyzed for the downstream and rear industries of the transportation, machinery, materials, and parts industry to set targets and directions for the technical support projects during the enterprise support. In particular, for the SMEs with less than 50 employees, the changes in the value added per enterprise were analyzed according to the period from the year of foundation. In the case of the rear industry, the value added by companies within three years after foundation has decreased gradually each year, so technical support is needed at the beginning of the startup. Companies between the ages of five and nine years are showing a fluctuating trend each year. Therefore, it is necessary to support business diversification or find new items.

준정적해석을 통한 승용차용 등속조인트 부품의 접촉력 및 소성변형 분석

이형욱(Hyoungwook Lee),정준영(Jun Young Jeong),조호선(Hosun Cho),오병기(Byung-ki Oh) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.5