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철도시설물의 연직방향 진동저감을 위한 마찰형 진동격리장치
최상현(Sanghyun Choi),백준호(Joon-Ho Baek),이유인(You In Lee),방인석(Inseok Bang) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
경제적 수준의 향상으로 쾌적한 환경에 대한 기대치가 높아짐에 따라 도심지에 건설되는 교량, 역사 등 철도구조물의 기능적인 측면 외에 소음 및 진동을 효과적으로 저감할 수 있는 능력이 더욱 중요해지고 있다. 이 논문에서는 최근 개발된 마찰댐퍼와 폴리우레탄 스프링을 이용한 연직방향 진동격리장치의 개요와 거동 특성 시험 결과를 제시하였다. 장치의 거동 특성 해석을 위한 모델은 수직방향 분력과 마찰재의 마찰계수 및 경사각, 스프링 강성을 이용하여 구성하였고, 유한요소해석 프로그램인 ANSYS를 사용하여 해석을 수행하였다. 개발된 진동격리장치의 실제 거동을 확인하기 위하여 시제품을 제작하고 시험을 수행한 결과 해석 모델을 이용한 결과와 비교적 잘 일치하고 있음을 확인하였다. In response to the increased expectations for a pleasant environment due to improved economic level, the ability to reduce the noise and vibration of such railroad facilities as bridges and stations to be built in downtown is becoming more important than the functional aspect. In this paper, the outline and verification test results of the recently developed device designed for vertical vibration reduction are presented. The device is composed of the friction damper and polyurethane springs. The analysis model for the behavior characteristics of the device is built using the force components in the vertical direction, friction coefficient of the friction material, the slope angle, and the spring stiffness. The analysis is performed using the commercial finite element analysis program, ANSYS. The prototype of the device is utilized in the test, and the test result reveals that the behavior of the device is in good agreement with the analytical prediction.
이억섭(Ouk Sub Lee),백준호(Joon Ho Baek),이계승(Gye Seung Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
This study has observed that the dynamic deformation behavior of the hot rolled plate(SPFH540 or JISG3134) within elastic region by using a low-velocity impact test procedure. The shape of specimen is a circular plate with fixed boundary condition around the specimen. To measure the dynamic strain accurately, a direct-calibration technique is developed in this study. The strain gages are attached to the specimen along both the radial and tangential directions. The stress distributions are calculated by using the measured dynamic strain and compared with theoretical values.
운전하중 조건에서 소형 풍력 발전기용 사출 나선형 블레이드 구조특성 평가
길영욱(Young-Uk Gil),조영관(Young-Kwan Jo),지호성(Ho-Seong Ji),양형근(Hyoung-Keun Yang),백준호(Joon-Ho Baek),제덕근(Duk-Geun Je),정호승(Ho-Seung Jeong),박상후(Sang-Hu Park) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.2
The purpose is to evaluate the structural characteristics of 750 mm diameter injection spiral blades under various operating conditions. A fiber-glass reinforced polypropylene material was employed to the injection blades, and mechanical tests on two kinds of glass-reinforced polypropylene were performed to evaluate the mechanical properties and to select a suitable candidate material. Also, three kinds of spiral blade geometries were studied to observe the influence of fixing rods between blades. For this, structural analyses were conducted to understand the role of fixing rods under a range of rotating speed. In addition, modal analysis was performed to confirm the resonance in the operating speed range. One-way fluid-structure interaction (FSI) analysis was carried out to know its mechanical integrity under dangerous wind speed conditions. Through this work, the structural characteristics of the proposed spiral blade geometries were studied under various operating conditions, and the requirements of mechanical properties of blades were determined.
일반 구조용강 열간 압연 박판에 대한 K-R 곡선 결정
이억섭(Ouk Sub Lee),이계승(Gye Seung Lee),백준호(Joon Ho Baek),편장식(Jang Sik Pyun) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.3
Some materials exhibit a rising R curve, while the R curve for other materials is flat. The shape of the R curve depends on material behavior and, to a lesser extent, on the configuration of the cracked structure. The R curve for an ideally brittle material is flat because the surface energy is an invariant material property. When nonlinear material behavior accompanies fracture, however, the R curve can take on a variety of shapes. Five different hot-rolled thin plates are tested to investigate R-curve behavior. A special experimental apparatus is used to prevent specimen buckling.
이현승(Hyun-Seung Lee),이영신(Young-Shin Lee),백준호(Joon-Ho Baek),천병선(Byong-Sun Chun),김석윤(Suk-Yoon Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The X-ring is a loop of elastomer with X-ring cross-section used as a mechanical seal or gasket. X-ring is designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. The seal is designed to have line contact between the x-ring and sealing faces. This study aims to detect contact stress and deformed shape of X-ring shell with various compression conditions. For this analysis, four experiments were conducted to obtain material properties of elastomer. The contact stress analysis is performed by applying material properties that obtain data through experiments. A contact stress analysis is carried out by finite element analysis. As a result of contact analysis about X-ring and O-ring with variable compression rate, the X-ring is more airtight than the O-ring. Also, X-ring keep up the double seal until compression rates are from 0% to 20%.
이현승(Hyun-Seung Lee),이영신(Young-Shin Lee),백준호(Joon-Ho Baek),천병선(Byong-Sun Chun),김석윤(Suk-Yoon Kim),이재옥(Jae-Wook Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The wedge-type pipe joint which is adapted for pipelines can improve workability, functionability and economical aspects significantly more than existing pipe joint. The work is significantly reduced because wedge-type pipe joint can joining pipe by one ?touch action. The wedge-type pipe joint is composed of wedge-type stopper, spring and housing. The wedge-type stopper moves along the tilted surface of the housing and securely fixes the pipe. In this study, the structural contact analysis on multi-groove stopper of the wedge-type pipe joint is carried out by finite element analysis. Results of the contact analysis according to housing angle, optimized angle of housing are 9.75°.