• Title/Summary/Keyword: Design structure

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Optimal reinforcement design of structures under the buckling load using the homogenization design method

  • Min, Seungjae;Kikuchi, Noboru
    • Structural Engineering and Mechanics
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    • v.5 no.5
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    • pp.565-576
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    • 1997
  • The material-based homogenization design method generates arbitrary topologies of initial structural design as well as reinforcement structural design by controlling the amount of material available. However, if a small volume constraint is specified in the design of Lightweight structures, thin and slender structures are usually obtained. For these structures stability becomes one of the most important requirements. Thus, to prevent overall buckling (that is, to increase stability), the objective of the design is to maximize the buckling load of a structure. In this paper, the buckling analysis is restricted to the linear buckling behavior of a structure. The global stability requirement is defined as a stiffness constraint, and determined by solving the eigenvalue problem. The optimality conditions to update the design variables are derived based on the sequential convex approximation method and the dual method. Illustrated examples are presented to validate the feasibility of this method in the design of structures.

Light Wing Spar Design for High Altitude Long Endurance UAV (고고도 장기체공무인기 경량 주익 스파 설계)

  • Shin, Jeong Woo;Park, Sang Wook;Lee, Mu-Hyoung;Kim, Tae-Uk
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.22 no.2
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    • pp.27-33
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    • 2014
  • There are several methods to improve the flight efficiency of HALE(High Altitude Long Endurance) UAV(Unmaned Aerial Vehicle). Airframe structural point of view, weight reduction of the airframe structure is the most important method to improve the flight efficiency. In order to reduce the weight of airframe structures, new concepts which are different from traditional airframe structure design such as the mylar wing skin should be introduced. The spar is the most important component in a mylar skin wing structure, so the spar weight reduction is the key point for reduction of the wing structural weight. In this study, design trade-off study for the front spar of the HALE UAV wing is conducted in order to reduce the weight. Design and analysis procedure of high aspect ratio wing spar are introduced. Several front spar structures are designed and trade-off study regarding the weight and strength for the each spar are performed. Spar design configurations are verified by the static strength test. Finally, optimal front spar design is decided and applied to the HALE UAV wing design.

DESIGN OPTIMIZATION OF AN INDUSTRIAL 3/2 WAY PNEUMATIC VALVE CONSIDERING FLOW-STRUCTURE CHARACTERISTICS (3/2 WAY 공압밸브의 유동-구조적 특성을 고려한 최적설계)

  • Yang, S.M.;Baek, S.H.;Kim, T.W.;Jung, I.S.;Kang, S.
    • 한국전산유체공학회:학술대회논문집
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    • 2011.05a
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    • pp.605-607
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    • 2011
  • A Study on the flow-structure characteristics of a 3/2 way pneumatic valve is essential for optimizing the performance of ship engines. It is important for the valve to have desirable safety factor am reduced weight from the safety and economic point of view. In this study, we capture flow-structure characteristics of 3/2 way pneumatic valve. This is optimized based on the proper design criteria. The air at a pressure of 30 bar is the working fluid which is made to fill in the tack in short time. This time is defined as the filling time. The flow and structure analysis is performed for three cases under maximum stress and safety factor. In optimum design, considering the flow-structure characteristics, we model twenty seven cases by using DOE(design of experiments) method Here, analysis for each cases is performed and then metamodels are created We obtain optimized parameters and then analysis is repeated to compare with the initial model. Finally, the feasibility of the optimum design is verified.

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A Study on Meaning of Open Structure in Clothing Design (복식 디자인에 표현된 의미적 열린 구조)

  • Cho, El-Lie;Kim, Young-In
    • Journal of the Korean Society of Costume
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    • v.56 no.9 s.109
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    • pp.1-13
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    • 2006
  • The purpose of this study is to apply a concept of open structure to clothing design and to verify the characteristics found in the various types of clothing which has open structure. The literatures from various academic fields including philosophy, literature, social science, architecture, and fine arts are investigated to define the concept of openness and to analyze it from the perspectives both of the visual and of the moaning of openness. This paper is to identify the types and the characteristics of clothing by future intention, complexity, discontinuity of open structure. By closely examining fashion design after 1980s found in fashion collection publications and designer's websites, the results of this study are as follows: first, the concept of openness can be classified into two different levels, that is, visual and meaning, secondly, in clothing the concept of open structure is applied to the meaning side by future intention, by complexity and by discontinuity. Open structure through future Intention has new content and interpretation and must have the possibility of intelligence awakening, future guidance and basic contents. Open structure through complexity has secondary function exists concurrent with the shape key example is the smart clothes with the digital functions. It has functions of amusement, supplement and protective, and is future clothes which satisfies with health, welfare, desire of beauty. Open structure with discontinuity is clothes with dramatic changes in system, structures and states. Structure can be changed by silhouette, detail, or fabric, material, or dramatic and practical function as tools in terms of productions and environment. This study can help to formulate and to integrate the concept of open structure in clothing with various phases and enhance the value of clothes by showing an application of the concept of openness to the clothing in meaning level.

A study on the development of jewelry design based on the diamond crystal structure (다이아몬드 결정구조를 모티브한 주얼리 디자인 개발에 관한 연구)

  • Eunju Park;Soi Moon;Jeongwon Seok
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.33 no.4
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    • pp.158-164
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    • 2023
  • The meaning of the diamond crystal structure and the formative beauty of the crystal form were designed from a new perspective and expressed in jewelry. In this study, we examined the literature on the crystal structure of diamonds and analyzed cases of jewelry design based on the formative characteristics of diamond crystal structure. we newly interpreted the meaning and value of diamond crystal structure, and studied the figurative design that can show the aesthetic effect of the crystal structure by designing the diamond crystal structure as jewelry. By presenting jewelry designs that take advantage of the symmetry effect of the diamond crystal structure and the repetition of the sculptural beauty, we hope that the fundamental beauty and cultural meaning of gemstones will be re-recognized.

On the Development of an initial Hull Structural CAD System based on the Semantic Product Data Model (의미론적 제품 데이터 모델 기반 초기 선체 구조 CAD 시스템 개발)

  • 이원준;이규열;노명일;권오환
    • Korean Journal of Computational Design and Engineering
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    • v.7 no.3
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    • pp.157-169
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    • 2002
  • In the initial stages of ship design, designers represent geometry, arrangement, and dimension of hull structures with 2D geometric primitives such as points, lines, arcs, and drawing symbols. However, these design information(‘2D geometric primitives’) defined in the drawing sheet require more intelligent translation processes by the designers in the next design stages. Thus, the loss of design semantics could be occurred and following design processes could be delayed. In the initial design stages, it is not easy to adopt commercial 3D CAD systems, which have been developed f3r being used in detail and production design stages, because the 3D CAD systems require detailed input for geometry definition. In this study, a semantic product model data structure was proposed, and an initial structural CAD system was developed based on the proposed data structure. Contents(‘product model data and design knowledges’) of the proposed data structure are filled with minimal input of the designers, and then 3D solid model and production material information can be automatically generated as occasion demands. Finally, the applicability of the proposed semantic product model data structure and the developed initial structural CAD system was verified through application to deadweight 300,000ton VLCC(Very Large Crude oil Carrier) product modeling procedure.

Component deformation-based seismic design method for RC structure and engineering application

  • Han, Xiaolei;Huang, Difang;Ji, Jing;Lin, Jinyue
    • Earthquakes and Structures
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    • v.16 no.5
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    • pp.575-588
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    • 2019
  • Seismic design method based on bearing capacity has been widely adopted in building codes around the world, however, damage and collapse state of structure under strong earthquake can not be reflected accurately. This paper aims to present a deformation-based seismic design method based on the research of RC component deformation index limit, which combines with the feature of Chinese building codes. In the proposed method, building performance is divided into five levels and components are classified into three types according to their importance. Five specific design approaches, namely, "Elastic Design", "Unyielding Design", "Limit Design", "Minimum Section Design" and "Deformation Assessment", are defined and used in different scenarios to prove whether the seismic performance objectives are attained. For the components which exhibit ductile failure, deformation of components under strong earthquake are obtained quantitatively in order to identify the damage state of the components. For the components which present brittle shear failure, their performance is guaranteed by bearing capacity. As a case study, seismic design of an extremely irregular twin-tower high rise building was carried out according to the proposed method. The results evidenced that the damage and anti-collapse ability of structure were estimated and controlled by both deformation and bearing capacity.