탄성지지를 갖는 셸판넬의 고유진동수해석

여동준 여수대학교 1998 論文集 Vol.12 No.2

This paper describes the formulation for the analysis of the free vibration of cylindrical shell panels with elastic supports by the transfer influence coefficient method. This method was developed on the base of the concept of the successive transmission of dynamic influence coefficients. The analysis algorithm for cylindrical shell elastically restrained by springs, which plays an important role in many industrial fields, is discussed. The supporting springs have the axial, circumferential, radial and rotational spring constants uniformly distributed along the circumference of the shell. The simple computational results on a personal computer demonstrate the validity of the present method, that is, the numerical high accuracy analysis method and the flexibility for programming, compared with results of the transfer matrix method. We also confirmed that the present algorithm could obtain the solutions of high accuracy for system with a number of intermediate rigid supports. And we could easily treat the intermediate support and all boundary conditions by adequately varying the values of spring constants.

제1주제 : 海外進出企業의 租稅對應과 政策課題

여동준,이태로(사회자),박용만(토론자),황옥규(토론자),차재능(토론자),김기섭(토론자) 한국국제조세협회 1994 조세학술논집 Vol.10 No.-

탄성지지된 두꺼운 곡면판의 자유진동해석

여동준,김명준 여수대학교 2002 論文集 Vol.17 No.-

The analysis algorithm for thick urved plates is discussed as they are extensively used in many industrial fields such in marine, nuclear and aerospace structures. The equations of vibration of a cylindrically thick curved plate based on the Herrmann Mirsky theory are written a coupled set of first order differential equations. By introducing the transfer matrix of the curved plates in the circumferential direction, these equations are written in a matrix differential equation. The supporting springs have the axial, circumferential, radial and two rotational spring constants uniformly distributed along the axis of the curved plates. The natural frequencies are calculated numerically up to higher modes for simple computational models. We also investigated the dynamic characteristics of various of type of vibration arising in the curved plates quantitatively.

탄정지지와 보강재를 갖는 사각판의 고유치해석

김원철,여동준 여수대학교 1997 論文集 Vol.11 No.2

This paper describes the formulation for the analysis of the flexural free vibration of rectangular plate structure with elastic supports and stiffeners by the transfer influence coefficient method. This method was developed on the base of the concept of the successive transmission of dynamic influence coefficients. Rectangular plate are simply supported at two opposite sides, and it has the stiffeners and distributing springs over node line normal to two simply supported edge. The validity of the present method is demonstrated through simple numerical example, and is also compared with results of the transfer matrix method on a personal computer. And all boundary conditions and the intermediate stiff can be treated only by adequately controlling the values of spring constants.

전달영향계수법에 의한 스트링거가 부착된 사각판구조물의 자유진동해석 ( Free Vibration Analysis of Rectangular Plate Structure with Stringer by the Transfer Influence Coefficient Method )

여동준,정병규,문덕홍 대한기계학회 1993 대한기계학회 춘추학술대회 Vol.- No.-

보강재를 갖는 셸판넬의 자유진동해석

여동준 여수대학교 1999 論文集 Vol.14 No.2

This paper describes the formulation for the analysis of the free vibration of cylindrical shell panels with stiffeners by the transfer influence coefficient method. This method was developed on the base of the successive transmission of dynamic influence coefficients. The simple computational results on a personal computer demonstrate the validity of the present method, that is, the numerical high accuracy analysis method and the flexibility for programming, compared with results of the transfer matrix method. We also confirmed that the present algorithm could obtain the solutions of high accuracy for system with stiffeners.

중간지지부를 갖는 환상형 판의 면내 자유진동해석

여동준 외 전남대학교 수산과학연구소 2006 수산과학연구소논문집 Vol.15 No.2

In this paper, the authors formulated analytical algorithm for the in-plane free vibration of a annular plate with intermediate support part by the transfer influence coefficient method (TICM) which is based on the successive transmission of influence coefficients on nodal circumferences. To confirm the effectiveness of the suggested algorithm, we analyzed the free vibration of a annular plate with three typical intermediate support parts by the TICM and the Transfer matrix method (TMM) on a personal computer. The computational result was that the TICM was superior to the TMM in the in-plane free vibration analysis of a annular plate with rigid intermediate supports.

끝이 잘린 원추형 셸의 진동해석 알고리즘의 개발

여동준(D. J. Yeo) 한국동력기계공학회 2005 동력시스템공학회지 Vol.9 No.3

바텀애시 미분말을 이용한 지반개량재의 강도 평가

여동준(Dong Jun Yeo),이병석(Byung Suk Lee),고건우(Kun Woo Ko) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.9

석탄화력발전소의 산업부산물인 바텀애시는 매년 800만톤 이상이 꾸준히 배출되고 있으나, 플라이애시에 비해 입경의 크기가 불규칙하고 물리화학적으로 불리하여 대부분이 매립되고 있다. 이 바텀애시를 분쇄하여 미분말 바텀애시를 얻어내었으며, 이 미분말 바텀애시를 여러 혼화재들과 혼합하고 일축압축강도시험을 측정하여 사면 표층개량에 사용하는 지반개량재로서 사용가능성을 분석하였다. 바텀애시를 30시간동안 분쇄하여 분말도 6,870㎠/g의 미분말 바텀애시를 얻어낼 수 있었으며, XRF분석을 통해 SiO₂와 Al₂O₃의 포졸란 반응을 유발할 수 있는 화학성분이 포함되어 있다는 것을 알아낼 수 있었다. 바텀애시 미분말을 시멘트, 2종류의 폐석고 및 여러 혼화재들과 혼합을 하였으며, 각 재료들의 배합비를 실험군별로 다르게 혼합하여 일축압축강도 시험을 실시하여 최적의 강도를 나타내는 최적배합비를 찾아내었고, 이를 비교하기 위하여 현장에서 사용되고 있는 여러 지반개량재들과 비교하였다. 시험결과, 바텀애시 미분말을 이용한 지반개량재의 강도가 실제 지반개량재를 사용한 시험군과 강도증진양상이 초기에 높거나 비슷하였고, 28일 강도는 비슷한 결과를 나타내는 것으로 미루어 보아, 미분말 바텀애시를 시멘트 및 황산염계 폐석고와 혼합하였을 경우 지반개량재로 사용할 수 있을 것으로 판단된다. Although more than 8 million tons of bottom ash has continuously been discharged, most of it is reclaimed due to its irregular particle size, and physical and chemical disadvantages as compared to fly ash. In this study, fine powder bottom ash was mixed with various admixtures and a uniaxial compressive test was conducted on the mix to analyze the possibility of using it as a soil stabilization material. The bottom ash was pulverized for 30 hours to obtain a fine powder with a specific surface area of 6,870㎠/g, and a chemical component that could induce a pozzolan reaction between SiO₂ and Al₂O₃ was added to this powder. The uniaxial compressive test conducted on the mix of bottom ash and admixture gives the optimal blending ratio showing the optimal strength, and it was compared with the corresponding values for various ground improvement materials. As a result of the test, the strength of the soil stabilization material made from the fine powder of bottom ash at the beginning was higher or similar to that of a test group that was using actual soil stabilization materials, and the 28-day strength showed similar results. It is concluded in this work that the fine powder of bottom ash mixed with cement and sulfate-based waste gypsum can be used as a soil stabilization material.

환원판의 면내 자유진동해석

여동준(D. J. Yeo),최명수(M. S. Choi),변정환(J. H. Byun),양정규(J. K. Yang),서정주(J. J. Suh) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-

In this paper, the authors formulated analytical algorithm for the in-plane free vibration of a annular plate with intermediate support part by the transfer influence coefficient method (TICM) which is based on the successive transmission of influence coefficients on nodal circumferences. To confirm the effectiveness of the suggested algorithm, we analyzed the free vibration of a annular plate with three typical intermediate support parts by the TICM and the Transfer matrix method (TMM) on a personal computer. The computational result was that the TICM was superior to the TMM in the in-plane free vibration analysis of a annular plate with rigid intermediate supports.