• Title/Summary/Keyword: design requirements

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Application of Design Axiom to Marine Design Problems (조선분야에서의 설계공리의 응용)

  • Y.S. Song;Y.S.Yang;B.S. Jang
    • Journal of the Society of Naval Architects of Korea
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    • v.36 no.3
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    • pp.107-114
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    • 1999
  • Design Axiom proposed by N. P. Such consists of Independence Axiom & Information Axiom. Based on the Independence Axiom, it is very useful specially for early design stage such as conceptual design to generate the design alternatives by considering both functions and structures of product. Since the Information Axiom shows that the design solution should have a least information to be the best one among the many alternatives, this axiom can be used for the best selection purpose during the preliminary design stage. In this paper, the possibility of Design Axiom in marine design application is checked by carrying out three examples of marine design. In the conceptual design of thruster, it is proven to use the Independence Axiom very effective by relating directly functional requirements with design parameters, one by one. In main engine selection example, Information Axiom is used to select best solution among alternatives by choosing the one having the minimum information quantity. For similarity based design in which the selection of changing design variables and the amount of those are important, it is proved that design axiom applied to Barge design case would be very effective and useful. As functional requirements and constrains were not clarified in early design stage, design axiom shows some difficulty for larger system design like ship which is basically carried out by an incremental and iterative process.

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Characteristics of Seismic Design of Concrete Structures in New Zealand Standards(NZS) (콘크리트 구조물에 대한 뉴질랜드 내진설계 규준의 특성)

  • 이한선
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2000.04a
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    • pp.375-382
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    • 2000
  • This paper briefly summarizes the basic concepts and main characteristics of seismic design of New Zealand Standards(NZS) with regard to reinforced concrete(RC) structures. NZS used the concept of the capacity design and the limit state design to satisfy the requirements of serviceability and safety. Plastic mechanisms and details with respect to the limit state of safety are briefly presented in this paper. The understanding of this advanced seismic design concept will enable us to implement the basic theory of capacity design and contribute to the development of Korean seismic code in new generation,

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DEVELOPMENT OF SEISMIC DESIGN CODES OF KOREA

  • Chang, Sung-Pil;Kim, Jae-Kwan;Lee, Jae-Hoon
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 1999.10a
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    • pp.319-331
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    • 1999
  • The seismic hazard of Korea is briefly described. The seismic design requirements design earthquake levels and design response spectrum that are going to be adopted in the future code system are introduced. Characteristics of ground motion and seismic responses of structures in low to moderate seismicity regions are briefly described. The concept of limited ductility design that seems appropriate for the seismic design in Korea is explained.

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A Study of Kinematic Selection and Design of Manipulator Aimed to Specified Task (작업지향형 매니퓰레이터 기구설계기법에 관한 연구)

  • Lee, Hee-Don;Yu, Seung-Nam;Ko, Kwang-Jin;Han, Chang-Soo
    • Proceedings of the KSME Conference
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    • 2007.05a
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    • pp.939-944
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    • 2007
  • Generally, development of a robot capable of fast movements or high payloads is progressed by the analysis of dynamic characteristics, DOF positioning, actuator selection, structure of links, and so on. This paper highlights the design of a robot manipulator handled by a human for man-machine cooperation. The requirements of the proposed system include its having multi-DOF(Degree of Freedom)and the capacity for a high payload in the condition of its maximum reach. The primary investigation factors are motion range, performance within the motion area, and reliabilityduring the handling of heavy materials. Traditionally, the mechanical design of robots has been viewed as a problem of packaging motors and electronics into a reasonable structure. This process usually transpires with heavy reliance of designerexperience. Not surprisingly, the traditional design process contains no formally defined rules for achieving desirable results, as there is little opportunity for quantitative feedback during the formative stages. This work primarily focuses on the selection of proper joint types and link lengths, considering a specific task type and motion requirements of the heavy material handling.

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Design for Flight Control System Focused on Reliability (신뢰성 목표를 위한 비행제어 시스템 설계)

  • Kim, Sung-Su;Park, Choon-Bae
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.33 no.11
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    • pp.33-40
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    • 2005
  • The reliability of flight control system(FCS) for Unmanned Air Vehicle(UAV) is underestimated because of the design restrictions such as small size, low cost and light weight. However because the failure of FCS may cause the loss of aircraft, the reliability of FCS must be analysed and validated whether it meet the reliability requirements in design phase.In this paper the failure rate of subsystems was divided with its function based on the design experience of FCS. The redundancy models which satisfy the system reliability requirements were suggested. These results may be utilized in the hardware design of FCS.