• Title/Summary/Keyword: co-design

Search Result 7,444, Processing Time 0.038 seconds

A Study on Size Optimization of the Big Bracket in the Cargo Hold of Crude Oil Tanker (유조선 화물창내 대형 브라켓 치수 최적화 연구)

  • Lee Jong Hwan;Shin Sang Hoon;Kim Doehyun;Hwon Jin Chil
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2005.06a
    • /
    • pp.63-68
    • /
    • 2005
  • Optimum design of the big brackets is performed through iterated 3-D FE analyses to meet the permissible limits of stress, which consumes an excessive amount of calculation time. Therefore, this study has been prepared to determine rapidly and accurately an optimum size and scantling of the big brackets at the initial design stage. The generalized slope deflection method (GSDM) based on the span point concept is applied to enhance the efficiency of iterated structural analyses. The accuracy and applicability of the present method is verified by comparing with a detail 3-D FE analysis of web frame structures. As an optimization technique, evolution strategies (ES) are applied using discrete design variables for practical design.

  • PDF

Optimal Design of Cylinder Configuration for a 1-Stage Two Cylinder $CO_2$ Compressor (1단 2실린더 $CO_2$ 압축기의 실린더 형상 최적 설계)

  • Ahn, Jong-Min;Kim, Hyun-Jin;Cho, Sung-Oug
    • Proceedings of the SAREK Conference
    • /
    • 2008.11a
    • /
    • pp.119-124
    • /
    • 2008
  • Recently, focus has been drawn on natural refrigerants due to increasing concern on global warming. As a consequence, CO2 systems such as a heat pump water heater using CO2 as a refrigerant are rapidly growing on the market. Currently, rolling piston rotary compressors are widely used for CO2 heating and/or refrigeration systems. There are several ways of realizing gas compression structure. They are single stage compression with single cylinder, single stage compression with two cylinders, and two stage compression with two cylinders. In this paper, computer simulation program which was validated for a single stage rotary compressor with one cylinder has been extended for a single stage, two cylinder rotary type. Numerical investigation has been made on optimal design for the cylinder configuration using the extended simulation program. For a single stage two cylinder rotary compressor having a displacement volume of 4 cc for each cylinder, compressor efficiency has been found to be maximum when the cylinder radius and height are 31mm and 10mm, respectively.

  • PDF

A Case Study On The Design of Tunnel Type Spillway (터널형 비상여수로의 설계 사례)

  • Baek, Seung-Kyu;Choo, Seok-Yeon;Baek, Un-Il;Park, Hyung-Seop
    • Proceedings of the Korean Geotechical Society Conference
    • /
    • 2006.10a
    • /
    • pp.153-160
    • /
    • 2006
  • Tunnel type spillway is rarely constructed in worldwide, and designed secondary in Korea. In this paper we pronounce a case study of tunnel type spillway design. We firstly considered lining concrete abrasiveness and cavitations for tunnel safety. This paper describes the design of tunnel type spillway section, excavation method, blasting, support and concrete lining.

  • PDF

A Study on Realization Method of Low Carbon School Building (저 탄소 학교건축물 구현 방안에 관한 연구)

  • Tae, Sung-Ho;Cho, Young-Sang;Shin, Sung-Woo;Lee, Seung-Min;Meang, Joon-Ho
    • The Journal of Sustainable Design and Educational Environment Research
    • /
    • v.9 no.2
    • /
    • pp.30-37
    • /
    • 2010
  • This study purposed realization and a phase reduction of school building $CO_2$ emissions. Accordingly selected standard school buildings and evaluated life cycle environmental load($CO_2$). This study proposed Green building technology which separated design sector, energy sector, afforestation sector for carbon-neutral city school buildings realization of M-city. As a result, elementary, middle and high schools of M-city built in the year 2013 were required that design sector was Energy Performance Index(EPI) 75 point and energy sector was solar installations more than 25% of the power usage, Solar systems installed more than 10% of total gas consumption and the area of afforesting more than 35% of the ecological area to achieve 30% $CO_2$ reduction compared to the Respectively standard school buildings.

Vibration of Initially Stressed Beam with Discretely Spaced Multiple Elastic Supports

  • Park, Nam-Gyu;Lee, Seong-Ki;Kim, Hyeong-Koo;Park, Ki-Sung
    • Journal of Mechanical Science and Technology
    • /
    • v.18 no.5
    • /
    • pp.733-741
    • /
    • 2004
  • Vibration behavior of an initially stressed beam on discretely spaced multiple elastic supports has been studied and a theoretical formulation of the system is derived using the variational principle. Unlike beams on an elastic foundation, discretely spaced supports can distort the beam mode shapes when the supports have rather large stiffness, i.e. usually expected beam modes cannot be obtained, but rather irregular mode shapes are observed. Conversely, irregular modes can be recovered by changing initial stress. Since support location is closely associated with the dynamic characteristics, this work also discusses eigenvalue sensitivity with respect to the support position and some numerical examples are investigated to illustrate the above findings.

An Establishment Case of Welding Robot OLP System Using 3D Design Model Information (설계모델정보를 이용한 용접로봇 OLP 시스템 구축 사례)

  • Oh, Sung-Kwan;Chai, Beam-Ho;Eun, Sean-Ho;Sung, Chang-Jae
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2007.09a
    • /
    • pp.43-47
    • /
    • 2007
  • In this paper, we will introduce how we utilize 3D design model information at factory automation field with welding robot OLP system which is in using at out shipyard. At this area, so far, most of design information is used in NC data generation for steel cutting, but we can utilize 3D model information at more wide and complex area likes robot welding. Moreover, OpenGL which is a graphic library can be possible to verify robot NC data is correct or not through 3D simulation even if some one is not a expert at robot handling.

  • PDF

A Study on Thickness Optimization of Bottom Floor for Container Ship (컨테이너선 Bottom Floor 두께 최적화에 대한 연구)

  • Lee, A-Mi;Ryu, Yeong-Ung;Lee, Joon-Hyuk;You, Yeong-Gyu
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2011.09a
    • /
    • pp.95-100
    • /
    • 2011
  • In general, thickness of bottom floor in fore/aft cargo hold region for container ship has been determined based on FEM analysis result of mid cargo hold region. But this approach has room for improvement because section shape and frame spacing in fore/aft cargo hold of container ship are quietly different from those of mid cargo hold. From this study, correlation between FEM result and grillage analysis result has been investigated and simple method for thickness determination of bottom floor in fore/aft cargo hold using newly improved grillage analysis is proposed.

  • PDF

Development of Optimization System in Shell Landing (Shell Landing 최적화 시스템 개발)

  • Lim, Hyung-Kyun;Kim, Jae-Chul;Lee, Ji-Hyun;Shin, Jun-Sik
    • Special Issue of the Society of Naval Architects of Korea
    • /
    • 2011.09a
    • /
    • pp.90-94
    • /
    • 2011
  • Longitudinal shell member that arranged block unit on 3D-curved surface is performed manual working by designer considering spacing of division characteristic, location and twisting at geometrical 3-dimensional form. Shell expansion drawing that drawn by initial design and shell landing work performed by hull production design have overlap of design work in terms of arrangement of shell longitudinal member. In this study, eliminate design overlap on shell member arrangement that is one of ship longitudinal member. Develop shell member optimization and auto arrangement system.

  • PDF

Structural Design of Cheongna City Tower

  • Chung, Kwangryang;Kim, Jung-Hyun;Song, Younghoon;Kim, Sihyeong;Kang, Jihun
    • International Journal of High-Rise Buildings
    • /
    • v.10 no.3
    • /
    • pp.193-201
    • /
    • 2021
  • Cheongna City Tower is a 448-meter-high rise observatory tower with 8.7:1 aspect ratio located at central lake park in Incheon Cheongna international city. The tower is a crystal shaped image and it turns invisible when the façade is activated. The tower was planned to be hexagonal 30-story building with two basements which are composed of mega frame structure using mega column and mega brace. In order to minimize the wind effect, the blow-through area was installed so that the wind can pass through. This observatory tower is an unprecedented project since the whole building is covered by façade for invisibility effect.

Optimal Design of a 2-Layer Fuzzy Controller using the Schema Co-Evolutionary Algorithm

  • Park Chang-Hyun;Sim Kwee-Bo
    • International Journal of Control, Automation, and Systems
    • /
    • v.3 no.3
    • /
    • pp.403-410
    • /
    • 2005
  • Nowadays, versatile robots are developed around the world. Novel algorithms are needed for controlling such robots. A 2-Layer fuzzy controller can deal with many inputs as well as many outputs, and its overall structure is much simpler than that of a general fuzzy controller. The main problem encountered in fuzzy control is the design of the fuzzy controller. In this paper, the fuzzy controller is designed by the schema co-evolutionary algorithm. This algorithm can quickly and easily find a global solution. Therefore, the schema co-evolutionary algorithm is used to design a 2-layer fuzzy controller in this study. We apply it to a mobile robot and verify the efficacy of the 2-layer fuzzy controller and the schema co-evolutionary algorithm through the experiments.