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이원홍,최청송,허윤준 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.2
고성능의 압력 트랜스듀서를 이용하여 교반탱크 내에서 발생되는 압력요동을 운전조건의 변화에 따라 측정하였다. 이 방법을 사용하여 범람과 부하상태의 전이영역을 쉽게 구분할 수 있었으며 타 연구자들의 연구결과와 비교분석하여 신뢰도를 확인할 수 있었다. 물질전달계수와 교반기에 의한 에너지소비를 측정하여 공동의 구조 변화와 비교해 본 결과 교반기의 날개뒤에 형성되는 공동의 형태는 물질전달과 교반기의 에너지소비에 큰 영향을 미친다는 것을 알 수 있었다. 압력요동의 스펙트럼분석으로부터 3-3구조를 갖는 공동의 발전정도가 운전조건에 따라 변화됨을 알 수 있었다. 이러한 결과들로부터 기-액 교반탱크에서 물질전달과 에너지소비면에 있어서 최적의 운전조건을 쉽게 얻을 수 있었다. The transition conditions between flooding and loading were easily found using a miniature hydrophone which detects the pressure differences in radial outflow between flooding and loading. The reliability of a proposed method was confirmed by comparing the data with an early published correlation equation. The mass transfer coefficients and the power consumptions of impeller depended on the cavity structures formed behind the impeller blades. From the spectrum analysis of pressure fluctuation, it was realised that the degree of progress of 3-3 structured cavity varied with the change of operating conditions in the 3-3 structured cavity region. In view of gas-liquid mass transfer and power consumptions, the optimal operating condition in an agitated reactor could be found by the spectrum analysis of the pressure fluctuations.
이원홍 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-
This paper presents the results of the load test performed on a PSC bridge and suggests the producer of bridge rating through the load test. In general the girder bridge resist the loads as a complex three-dimensional structural system. Therefore the test results are analyzed for the longitudinal and the transverse response characteristics. The bending moments based on the beam analysis are compared with the measured values for longitudinal response characteristics. The lateral load distribution characteristics are assessed based on the load test results for transverse characteristics. Also the rating fo the test bridge is performed by using the suggested rating procedure which considers the actual response characteristics of the bridge. The suggested procedure can be used for understanding of actual response characteristics and evaluating load carrying capacity of the PSC girder bridge.
축방향 압축 및 인장을 받는 탄성지반 위에 놓인 적층판의 휨 및 진동해석
이원홍 진주산업대학교 산업과학기술연구소 2002 산업과학기술연구소보 Vol.- No.9
The main purpose of this paper is to present deflections and frequencies of laminated composite plates on the so-called two-parameter foundations, e.g. an elastic foundation with shear layer. Reddy's higher-order shear deformation theory is applied by using the double-fourier series. To validate the proposed procedures, the displacements obtained in the present study for simply supported isotropic and orthotropic plates on elastic foundations under axial compression and tension are compared with those of Timoshenko and LUSAS program. Numerical results for displacements and frequencies are presented to show the effects of axial compression and tension, number of layers, material anisotropy, and shear modulus of foundations on the bending and vibration behavior of laminated plates.
TWO-PARAMETER 탄성지반위에 놓인 고차전단변형 역대칭 앵글-플라이 적층판의 정적 및 동적해석
이원홍 진주산업대학교 건설기술연구소 1998 건설기술연구소보 Vol.1 No.-
Static and Transient results for a anti-symmetric angle-ply laminated plate on two-parameter elastic foundations base on a higher-order shear deformation theory are presented. The effects on central deflection by plate thickness ratio, material modulus ratio, shear and winkler modulus of elastic foundations are investigated. To validate the derived equations, the obtained deflections of simply supported orthotropic plates are compared with those of Timoshenko. The information presented should be useful to composite-structure designers, to researchers seeking to obtain better correlation between theory and experiment and to numerical analysts in checking out their programs.