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한병기,이성희,유택인,Han, Byeong-Gi,Lee, Seong-Hui,Yu, Taek-In 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.5
The problem ofinstability of laminated circular cylindrical shell under the action of torsio or lateral pressure is investigated. The analysis is based on the Sander's theory for finite deformations of thin shell. The buckling is elastic for thin compoisite shell nad the geometry is assumed to be free of initial imperfections. The equilibrium equations are obrained by usitn the p[erturbation technique. Solution procedure is based on the Galerkin mehtod. The computer program for numerical results is made for several stacking sequence, length-to-radius ratio, and radius-to-thickness ratio. The numerical results of buckling load are present.
한병기,조민교,임채홍,김정준,김철 한국자동차공학회 2009 International journal of automotive technology Vol.10 No.4
An efficient multibody dynamic model was developed to predict the vibrating transmitted gear forces of loaded and unloaded pairs of helical gears simultaneously at all speeds. The model can also calculate the bearing forces of a manual transmission that, in turn, may be converted to rattling noises. The bending of meshing gear teeth and torsional flexibility of transmission shafts were considered and embodied effectively in the multibody dynamic model by calculating the tooth bending stiffness and adding a torsion spring on a shaft section between two gears, respectively. The reactive forces on teeth and bearings were calculated and compared using three different models that were developed for this study - an equivalent model, a rigid-body model, and a frequency-based model. The equivalent model took only 58% computation time, compared to the frequency-based method, even though the two showed very similar results. An efficient multibody dynamic model was developed to predict the vibrating transmitted gear forces of loaded and unloaded pairs of helical gears simultaneously at all speeds. The model can also calculate the bearing forces of a manual transmission that, in turn, may be converted to rattling noises. The bending of meshing gear teeth and torsional flexibility of transmission shafts were considered and embodied effectively in the multibody dynamic model by calculating the tooth bending stiffness and adding a torsion spring on a shaft section between two gears, respectively. The reactive forces on teeth and bearings were calculated and compared using three different models that were developed for this study - an equivalent model, a rigid-body model, and a frequency-based model. The equivalent model took only 58% computation time, compared to the frequency-based method, even though the two showed very similar results.
기계.시스템 디자인 공학 교과과정 개발을 위한 설문조사 사례 연구
한병기,최성준,김병주,조성산,김정수,지해성,박승호,Han Byoung-Kee,Choi Sung-Joon,Kim Byung-Joo,Cho Sung-San,Kim Jung-Soo,Jee Hae-Seong,Park Seoung-Ho 한국공학교육학회 2004 공학교육연구 Vol.7 No.2
To keep pace with rapidly changing social and technological trends, the Department of Mechanical and System Design Engineering at Hongik University is in the process of updating teaching materials and learning methodologies while evaluating/revising our existing curriculum. In order to be better apprised of the employment needs and student aspirations, we have conducted three separate but related surveys by targeting experienced professionals and managers, alumni working in industries as practising engineers, and our current students. The surveys have furnished us with valuable insights that, we hope, will lead to a new curriculum and learning methods more in tune with needs of our students as well as their future employers. Among other findings, the analysis of the survey responses points towards expansion of integrated laboratory and design experiences, cultivation of improved written and oral communication capabilities involving individual and team efforts, and development of interdisciplinary courses encompassing related fields of engineering as well as emerging fields such as nano and information technologies. 최근 홍익대학교 기계 시스템디자인공학과에서는 급변하는 시대 조류에 부응하도록 교과목 체계를 검증하고, 신규 교과목, 교수-학습 방법 및 교과과정을 개발하며, 산업체에서 필요로 하는 기술 인력을 양성하기 위해 전문가, 졸업생 및 재학생을 대상으로 설문조사를 실시하였다. 본 연구에서는 이 설문조사에 근거하여 산업체 중역과 현장 실무자가 필요로 하는 인재를 양성하는 동시에 재학생들의 요구도 충족할 수 있는 신규 교과목과 교수-학습 방법을 개발하고 적합한 교과목 체계를 검증하고자 한다. 재학생, 졸업생 및 전문가를 대상으로 한 설문조사를 분석한 결과, 신규 교과목 및 교수-학습 방법은 다양한 실습 경험 기회를 제공하고 언어 소통 능력을 교육하며 첨단/연계분야에 적합한 학과목을 개설함으로써 산업체에서 요구하는 인재를 양성하고, 재학생에게는 동기를 부여할 수 있는 방향으로 개발되어야 할 것으로 나타났다.
한병기,박봉현(B.K.Han),B.H.Park 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
In this paper, the thick-walled rectangular tubes are analyzed to evaluate the bent-buckling loads by semi-theoretical approach. The effect of material nonlinearity is considered for the case of the buckling behavior of the thick-walled tubes. The buckling behavior by bending forces is more complicate than that one by axial compression. The stress distributions at the loading edges are not simple when bending stresses are applied. Therefore, the modification factor is adopted to calculate the maximum bending moments. Analytical and experimental results are compared and close agreement of the results are observed.
재료의 비선형성을 고려한 후육 정사각튜브의 좌굴에 관한 연구
한병기,박봉현,정태은,홍승준 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The buckling is one of the major two nonlinear problems. One is the material nonlinear and other is the geometrical nonlinear. Material nonlinearity has occurred when the buckling stress exceeded the yield stress of material. The material nonlinearity is clearly encountered when the thickness is thick. Therefore, the material nonlinearity must be taken into account when the buckling analysis of thick pate is perpormed. In this study, inelastic modulus which is used to calculate the buckling strength is taken to account for the material nonlinearity.The results from experiments are used to formulate the semi-theoretical formula. The analysis results generated by the use of semi-theoretical formula are close to the experimental data.