• 제목/요약/키워드: Detail Structure

검색결과 1,172건 처리시간 0.028초

Structural design optimization of racing motor boat based on nonlinear finite element analysis

  • Song, Ha-Cheol;Kim, Tae-Jun;Jang, Chang-Doo
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제2권4호
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    • pp.217-222
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    • 2010
  • Since 1980's, optimum design techniques for ship structural design have been developed to the preliminary design which aims at minimum weight or minimum cost design of mid-ship section based on analytic structural analysis. But the optimum structural design researches about the application for the detail design of local structure based on FEA have been still insufficient. This paper presents optimization technique for the detail design of a racing motor boat. To improve the performance and reduce the damage of a real existing racing boat, direct structural analyses; static and non-linear transient dynamic analyses, were carried out to check the constraints of minimum weight design. As a result, it is shown that the optimum structural design of a racing boat has to be focused on reducing impulse response from pitching motion than static response because the dynamic effect is more dominant. Optimum design algorithm based on nonlinear finite element analysis for a racing motor boat was developed and coded to ANSYS, and its applicability for actual structural design was verifed.

LOD(Level of Detail)를 지원하는 하이브리드 렌더링 모델 (A Hybrid Rendering Model to support LOD(Level of Detail))

  • 김학란;박화진
    • 디지털콘텐츠학회 논문지
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    • 제9권3호
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    • pp.509-516
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    • 2008
  • 컴퓨터 그래픽의 다중 해상도를 지원하는 하이브리드 렌더링 방법을 제안한다. 기본적으로 단말기 환경의 성능과 사용자 요구조건에 따른 그래픽을 위한 다중해상도 방법은 메시를 이용하거나 렌더링 부분에서 텍스쳐의 밉매핑이나 옥트리를 이용한 레이 트레이싱들의 적응 방법이 사용되었다. 본 연구에서는 제안한 하이브리드 렌더링 방법은 지역조명 모델에서 기존의 고로 음영과 평면 음영 라이브러리를 개선한 방법으로 하나의 물체를 이루는 여러 개의 폴리곤에 각각 다른 음영법을 적절하게 적용한다. 실시간 렌더링 시간을 줄일 수 있는 효율적인 대안 방법이 될 수 있으며 이러한 장점이 유비쿼터스 환경에서 다양한 단말기 환경의 그래픽 콘텐츠의 실시간 적응 서비스에 매우 적절하게 사용될 수 있다.

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소형장비의 부품 교체단위결정 알고리즘을 고려한 정량적인 교체성 평가방법 (Quantitative Interchangeability Evaluation Method Considering Part Replacement Decision Algorithm of Small Equipment)

  • 김종도;손우현;박상진;목학수
    • 한국산업융합학회 논문집
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    • 제22권5호
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    • pp.537-544
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    • 2019
  • In currently electronic systems, the speed of information integration has increased due to the development of electronic technology. However, due to the increase in the number of parts and groups, the product structure has become complicated. In this paper, a study was conducted to evaluate quantitatively the replacement of a small equipment. First, the level of the replacement was determined through the algorithm for the replacement level of parts. Next, we defined the ease of detail replacment, and the factors for each detail replacement. In order to calculate the weighting of the detail ease, we performed the analysis of the replacement process of subcomponents of communication exchanger and defined the evaluation criteria. Finally, the completion of the evaluation check sheet and the evaluation score table.

Local structural alignment and classification of TIM barrel domains

  • Keum, Chang-Won;Kim, Ji-Hong;Jung, Jong-Sun
    • Bioinformatics and Biosystems
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    • 제1권2호
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    • pp.123-127
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    • 2006
  • TIM barrel domain is widely studied since it is one of most common structure and mediates diverse function maintaining overall structure. TIM barrel domain's function is determined by local structural environment at the C-terminal end of barrel structure. We classified TIM barrel domains by local structural alignment tool, LSHEBA, to understand characteristics of TIM barrel domain's functionalvariation. TIM barrel domains classified as the same cluster share common structure, function and ligands. Over 80% of TIM barrels in clusters share exactly the same catalytic function. Comparing clustering result with that of SCOP, we found that it's important to know local structural environment of TIM barrel domains rather than overallstructure to understand specific structural detail of TIM barrel function. Non TIM barrel domains were associated to make different domain combination to form a different function. The relationship between domain combination, we suggested expected evolutional history. We finally analyzed the characteristics of amino acids around ligand interface.

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지상 LiDAR를 이용한 철골보의 안전 및 사용성 모니터링을 위한 변위 계측기법 (Displacement Measuring Method using Terrestrial LiDAR for Safety and Serviceability Monitoring of Steel Beams)

  • 이홍민;박효선;이임평
    • 한국전산구조공학회:학술대회논문집
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    • 한국전산구조공학회 2005년도 춘계 학술발표회 논문집
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    • pp.190-197
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    • 2005
  • To monitor the safety and serviceability of a structures, structural responses including displacements due to various design and unexpected loadings must be measured. The maximum displacement and its distributions of a structure can be used as a direct assessment index on its stiffness. For this reason, there have been diversely studied on measuring of the maximum displacement of a structure. However, there is no practical method for measuring displacement of a structure. Therefore, in this paper, new displacement measuring method is developed and accuracy of LiDAR is examined in detail for development of a new method for measuring displacement of a structure.

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미세 Riblet 평판에서의 난류구조 변화에 관한 실험적 연구 (Experimental Study on Turbulent Structure of Flow over a Micro Riblet Plate)

  • 최용석;이상준
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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    • pp.375-376
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    • 2006
  • Turbulent structure of a boundary-layer over a flat plate coated with micro riblet film(MRF) has been investigated experimentally. The turbulent structure was visualized using a dynamic particle image velocimetry (Dynamic PIV) system. We identified the vortex structures from 2-D velocity field data by applying the complex eigenvalue definition. The velocity field images acquired by using the complex eigenvalue definition showed the whole 2-D vortex structures clearly. In addition, the spatial distributions of small-scale vortices as well as large-scale vortices were obtained with high accuracy. The difference of vortex structures between the MRF coated flat plate and the smooth flat plate was analysed in detail. With varying upstream flow speed, the characteristics of vortex structure over the MRF coated flate plate was compared with those over the smooth flat plate.

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와전류 감쇠기를 이용한 진동 억제 (Vibration Suppression Using Eddy Current Damper)

  • 곽문규;이명일;허석
    • 한국소음진동공학회논문집
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    • 제13권10호
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    • pp.760-766
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    • 2003
  • This paper is concerned with the eddy current damper which can be used to enhance the damping of the host structure. The operating principle of the eddy current damper is first explained in detail. The dynamic interaction between the magnets and the copper plate produces eddy current thus resulting in the damping force. By attaching the eddy current damper to the host structure, the damping of the total structure can be increased so that vibrations can be suppressed. The advantage of the eddy current damper is that it doesn't require any electronic devices and power supply The effect of the eddy current damper on the global dynamic characteristics of the structure is investigated by considering the cantilever with the eddy current damper. Experimental results show that the eddy current damper is an effective device for vibration suppression.

로봇 메니플레이터의 혼합 추적 제어를 위한 강인 가변구조제어기 (A Robust Variable Structure Controller for the Mixed Tracking Control of Robot Manipulators)

  • 이정훈
    • 전기학회논문지
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    • 제59권10호
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    • pp.1908-1913
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    • 2010
  • In this paper, a robust variable structure tracking controller is designed for the mixed tracking control of highly nonlinear rigid robot manipulators for the first time. The mixed control problem under consideration is extended from the basic tracking problem, with the different initial condition of both the planned trajectory and link of robots. This control problem in robotics is not addressed to until now. The tracking accuracy to the sliding trajectory after reaching is analyzed. The stability of the closed loop system is investigated in detail in Theorem 2. The results of Theorem 2 provide the stable condition for control gains. Combing the results of Theorem 1 and Theorem 2 gives rise to possibility of designing the improved variable structure tracking controller to guarantee the tracking error from the determined sliding trajectory within the prescribed accuracy after reaching. The usefulness of the algorithm has been demonstrated through simulation studies on the mixed tracking control of a two.link robot under parameter uncertainties and payload variations.

Study on Pulp Fibers and Paper Morphology by ESEM and LTSEM

  • Kim, Chul-Hwan;Yang, Jae-Kyung;Park, Chong-Yawl
    • Journal of the Korean Wood Science and Technology
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    • 제29권3호
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    • pp.73-82
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    • 2001
  • The ESEM could be used in investigating the fibrous networks developed during handsheet-forming processes with the exception of the stages relating to the actual dispersion of the fibers and the drying of formed sheets. Also the cross-sectional images of swollen fibers were generated with the ESEM but the information given by the images was rarely fresh compared to the CLSM images. The LTSEM was extremely useful in generating images of the microfibrillar structure of a wet fiber with great resolution. However, pretreatment required in the LTSEM chamber was somewhat tedious due to the time consumed in sublimation of ice and sputter coating. For observation of lamellar structure of a hydrated fiber, the LTSEM exhibited greatly detailed structure with high resolution. Finally ESEM and LTSEM should be used in a finite field such as observation of surface morphology in detail.

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내부직경 변화를 고려한 혈관의 유체-구조 상호작용 해석 (Fluid-Structure Interaction Analysis of Blood Vessel Considering Internal Diameter Variation)

  • 레사 옥타비안티;김동현;김수현;보이케 나바반;변준호
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2006년도 춘계학술대회논문집
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    • pp.959-963
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    • 2006
  • A three-dimensional elastic blood vessel model with internal diameter variation is considered to investigate internal flow characteristics and effects of structural deformation. Also, computational analyses for both the rigid model and the fully-coupled FSI model have been conducted in order to compare the shear stress, pressure distribution, and flow velocity in detail. A 70% narrowing area of asymmetric blood vessel model was especially investigated to show the versatility of fluid-structure interaction phenomenon. The results reveal that effect of fluid-structure interaction is very important to accurately investigate the flow characteristics of the blood vessel.

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