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이시복(Lee, Shi-Bok),이원태(Lee, Won-Tae),남경훈(Nam, Kyung-Hun) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.10
본 연구는 70톤 급 초대형 중장비에 사용되는 머플러를 실험과 경험 법칙을 통하여 개발하였다. 머플러 내 부의 파티션 플레이트, 천공관 그리고 파이프 구조를 변경하며 투과손실 성능을 비교하고, 실험 결과를 통하여 머플 러의 성능에 영향을 미치는 내부 음향 요소의 최적 조합과 배치를 결정하였다. In this study, a muffler for the super heavy machinery in the 70 ton class is developed. Developing process relies on experimental and rule of thumb approach. Various muffler internal structures consisting of partition plates, perforated and non-perforated through pipes, and absorbent are tried and compared for the transmission loss performance. Based on the experimental results, the best combination and locations of the internal acoustic components which affects the muffler performance are determined.
이시복,황상문,Lee Shi-Bok,Hwang Sang-Moon 한국공학교육학회 2000 공학교육연구 Vol.3 No.1
공학교육에 있어서 실험실습교육의 중요성은 매우 크다. 그러나 국내 공학교육현장에서는 예산, 시설 및 인력 등의 이유로 해서 최근까지도 실험실습교육이 형식적이고 취약한 것으로 나타나 있다. 부산대학교 기계공학부는 지난 몇 년간 국책사업 지원을 받아 실험실습교육 혁신을 추구하여, 정보화, 자동화 등의 다학제적 접근을 요구하는 기계공학의 발전 추세에 적응할 수 있는 창의적 현장적응력을 갖춘 우수한 기계공학도를 효과적으로 양성할 수 있는 실험실습교육체계를 구축해왔다. 본 글에서는 부산대학교 공과대학 기계공학부에서 추진하고 있는 실험실습 교육 강화 및 혁신 사례를 기계/전자/컴퓨터의 통합실험 실습, 실험분야의 계통화를 통한 체계적 운영 및 점진적 심화 교육, 대규모 교육 대상에 대한 효율적인 운영, 창의성 유도 실험실습 등을 중심 내용으로 기술하였다. Laboratory work is so much important in the engineering education. But laboratory work program at most domestic engineering education institutes is still poor and could not have been actively improved and reinforced due to the difficulty in preparing the necessary fund, facilities, professional personnel and so on. The school of mechanical engineering in Pusan National University, sponsored by the national special engineering education project, has poured intensive and strong efforts into improving and strengthening laboratory work program in the courses of education. In this paper, the brief content of the improved laboratory work program and the established system for putting through the program effectively are introduced around the topics such as the integrating laboratory work of mechanical/electronic/computer engineerings, systematic managing and progressive deepening of the laboratory level through the classification of the laboratory works, education system for putting through efficiently the program for a large mass of students and program for encouraging the creativity.
공압식 소재물림 가이드부쉬 시스템의 설계 및 가공정도 평가
이재훈,이수민,박성훈,이시복,Lee, Jae-Hoon,Yi, Su-Min,Park, Seong-Hun,Lee, Shi-Bok 한국생산제조학회 2010 한국생산제조학회지 Vol.26 No.1
Generally, a fixed type guide-bush system is installed during machining miniature work-pieces with high precision in the multi-task CNC lathe. But a conventional guide-bush system does not provide a constant clamping force under the condition of varying work-piece diameters. It is important to maintain a constant clamping force for guaranteeing machining precision. This paper proposes a new guide-bush system with a pneumatic clamping device for the CNC Swiss-turn lathe to keep constant clamping force with changes in work-piece diameters. Through performance tests, new clamping system developed in the study showed better machining precision at the cost of a small increase in the temperature of the system than conventional systems due to an increase in the frictional heat and a change in the heat transfer route.
유한요소해석을 통한 의료용 리프트 칼럼의 피로수명 예측
천희준,조진래,양희준,이시복,Cheon, Hee-Jun,Cho, Jin-Rae,Yang, Hee-Jun,Lee, Shi-Bok 한국전산구조공학회 2011 한국전산구조공학회논문집 Vol.24 No.3
매우 큰 편심하중을 지지하면서 상하로 수직위치를 제어하는 의료용 리프트 칼럼은 수직위치의 정확도를 확보하기 위해 매우 낮은 구조적 변형과 진동은 물론 높은 피로강도가 요구된다. 리프트 칼럼은 일반적으로 3단 슬라이딩 붐구조로 유도전동기로 작동되며, 상하운동에 따라 변동응력을 나타낸다. 본 연구에서는 리프트 칼럼의 상하운동으로 야기되는 변동응력에 따른 피로강도를 수치해석적으로 예측하였다. 한 주기 상하운동에 따른 응력변동은 유한요소해석으로 구하였으며, 피로수명은 Palmgren-miner기법과 재료의 S-N선도를 적용하여 예측하였다. 수치해석의 신뢰성을 확보하기 위하여 리프트 칼럼의 상세형상과 체결부위을 반영한 3차원 FEM모델을 생성하였으며, 칼럼과 패드사이 계면은 접촉조건으로 처리하였다. Medical lift column controlling the vertical position while supporting heavy eccentric load should have the high fatigue strength as well as the extremely low structural deflection and vibration in order to maintain the positioning accuracy. The lift column driven by a induction motor is generally in a three-step sliding boom structure and exhibits the time-varying stress distribution according to the up-and-down motion. This study is concerned with the numerical prediction of the fatigue strength of the lift column subject to the time-varying stress caused by the up-and-down motion. The stress variation during a motion cycle is obtained by finite element analysis and the fatigue life is predicted making use of Palmgren-miner's rule and S-N curves. In order to secure the numerical analysis reliability, a 3-D FEM, model in which the detailed lift column structure and the fitting parts are fully considered, is generated and the interfaces between lift column and pads are treated by the contact condition.
박성규(Sung Gyu Park),이시복(Shi Bok Lee),최주형(Joo Hyoung Choi) 한국소음진동공학회 2019 한국소음진동공학회 논문집 Vol.29 No.1
Dynamic vibration absorbers (DVAs) have long been used to suppress excessive vibration in structural systems. This paper deals with a dynamic vibration absorber system comprising both a translational absorber and a rotational absorber for vibration control of a plate. First, it is proven that the combined translational and rotational DVAs of the absorbers with no damper can effectively isolate the vibration for a specific vibration control-area of the plate. Then, the damping’s role for the combined DVAs is investigated to facilitate increased robustness of the DVA system to withstand variation of excitation force frequency. The determined optimization is then performed, and used to find the optimum parameters for the combined DVAs.
구조안전성 평가를 위한 무선 진동 모니터링 시스템 개발
심보군(Shim, Bo-Gun),이시복(Lee, Shi-Bok),채민성(Chae, Min-Sung) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.2
Wired monitoring systems have been used for damage detection and dynamic analysis of large structures(bridges, dams, plants, etc.). However, the real-world applications still remain limited, mainly due to time and cost issues inherent to wired systems. In recent years, an increasing number of researchers have adopted WSN(wireless sensor network) technologies to the field of SHM(structural health monitoring). Accurate time synchronization is most critical for the wireless approach to be feasible for SHM purpose, along with sufficient wireless bandwidth and highly precise measuring resolution. To satisfy technical criteria stated above, a wireless vibration monitoring system that uses high-precision MEMS(micro-electro-mechanical system) sensors and A/D convertor is discussed in detail. It was found experimentally that the level of time synchronization fell within $200\;{\mu}sec$.
박성규(Sung Gyu Park),이시복(Shi Bok Lee) 한국소음진동공학회 2016 한국소음진동공학회 논문집 Vol.26 No.6
The combined rotational and translational dynamic vibration absorbers (DVA) with no dampers for the beam vibration control can effectively isolate the vibration within the external excitation force region. This paper investigates the damping efficacy for the combined rotational and translational dynamic vibration absorbers to impose some robustness to the DVA system for the excitation force frequency variation. The beam is assumed to be subjected to a concentrated harmonic excitation force. The solution to the problem is found based on Galerkin method.