• 제목/요약/키워드: sensitivity design

검색결과 2,997건 처리시간 0.043초

기호계산을 이용한 현가장치의 민감도 해석 및 설계점의 최적 설계 (Sensitivity Analysis Using a Symbolic Computation Technique and Optimal Design of Suspension Hard Points)

  • 전형호;탁태오
    • 한국정밀공학회지
    • /
    • 제16권4호통권97호
    • /
    • pp.26-36
    • /
    • 1999
  • A general procedure for determining the optimum location of suspension hard points with respect to kinematic design parametes is presented. Suspensions are modeled as connection of rigid bodies by ideal kinematic joints. Constraint equations of the kinematic joints are expressed in terms of the generalized coordinates and hard points. By directly differentiating the constraint equations with respect to the hard points, kinematic sencitivity equations are obtained. In order to cope with algebraic complexity associated with the differentiation process, a symbolic computation technique is used. A performance index is defined in terms of static design parameters such as camber, caster, toe, ect.. Gradient of the performance index can be analytically computed from the kinematic sensitivity equations. Optimization results show the effectiveness and validity of the procedure, which is applicable to any type of suspension if its kinematic configurations are given.

  • PDF

민감도 해석을 이용한 3차원 단조공정의 최적설계에 대한 연구 (A Study on The Optimization of Three-Dimensional Forging Processes Using The Sensitivity Method)

  • 이석렬;양동열
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 2005년도 추계학술대회 논문집
    • /
    • pp.277-280
    • /
    • 2005
  • A shape optimization is applied to achieve a design objective in three-dimensional forging processes. In multi-stage forging processes, among the important design aspects, the die shape fur preforming is regarded as the design variable since it influences the forged part relatively higher than the others. The rigid-plastic finite element method and the sensitivity method are employed and formulated to solve a formulated optimization problem. An approximation scheme is also used for the direction search during the optimization. The upset forging of a square box is selected as a test example in order to demonstrate and verify the optimization process of this study. After the optimization, the optimized shape of the die yields a finial product of desire shape.

  • PDF

신사복 디자인의 감성에 관한 연구 (A Study on Human Sensitivity in Design of Men's suit)

  • Lee, Youn-Soon;Park, Yun-A;Jeong, Eun-Young
    • 한국의류학회지
    • /
    • 제26권12호
    • /
    • pp.1709-1715
    • /
    • 2002
  • 신사복 정장은 일상의 관습으로 착용되는 가장 중요한 항목으로서, 사무직, 관리 직, 전문직 등의 정신노동자들에 게 폭넓게 수용되는 매우 중요한 의복항목이 다. 따라서 소비자의 감성에 부합되는 신사복 개발을 위해 신사복 디자인에 대한 감성연구가 필요하다. 이에 본 연구에서는 신사복 상의 디자인 개발을 위해서 소비자의 감성에 적합한 신사복 상의를 적절하게 표현해 줄 수 있는 감성 어휘를 추출하고 그 인자를 분석하였다. 요인분석 결과,7개 의 요인과 67개 의 감성 어휘 가 채택되었다. 선택된 감성어휘는 인자별로 대별하여 7개의 요인으로 묶어서 대표적인 요인명을 붙인 결과, 요인 1은 품위성 요인. 요인 2는 매력성 요인. 요인 3은 실용성 요인, 요인 4는 체형성 요인. 요인 5는 외관성 요인. 요인 6은 남성미 요인. 요인 7은 활동성 요인이라고 하였다.

설계 민감도법을 이용한 유도 전기장 분포 제어를 위한 철심구조 최적화 연구 (Optimization of Iron Core Structure for Controlling Induced Electric Field Distribution Using the Continuum Design Sensitivity Analysis (CDSA))

  • 박준구
    • 대한전기학회논문지:시스템및제어부문D
    • /
    • 제55권8호
    • /
    • pp.397-400
    • /
    • 2006
  • An optimized iron core structure of stimulating coil are presented in order to control the induced electric field distribution using the Continuum Design Sensitivity Analysis (CDSA) combined with a commercially available generalized finite element code (OPERA). The results show that a Figure-Of-Eight (FOE) coil as well as a circular coil with the proposed iron core structure can increase induced electric field intensity by more than two times and make better field localization, compared with those of existing stimulation coil with a air core. After considering manufacturing constraints, a practical iron core structure based on the proposed optimized one is proposed and its performance is analyzed.

골조-전단벽 구조물의 횡변위제어를 위한 동적 민감도 해석 (Dynamic Sensitivity Analysis For Lateral Drift Control Of Frame-Shear Wall Structures)

  • 이한주;김지연;한승백;남경연;김호수
    • 한국전산구조공학회:학술대회논문집
    • /
    • 한국전산구조공학회 2007년도 정기 학술대회 논문집
    • /
    • pp.571-576
    • /
    • 2007
  • This study presents stiffness-based optimal design to control quantitatively lateral drift of frame-shear wall structures subject to seismic loads. To this end, lateral drift constraints are established by introducing approximation concept that preserves the generality of the mathematical programming and can efficiently solve large scale problems. Also, the relationships of sectional properties are established to reduce the number of design variables and resizing technique of member is developed under the 'constant-shape' assumption. Specifically, the methodology of dynamic displacement sensitivity analysis is developed to formulate the approximated lateral displacement constraints. The 12 story frame-shear wall structural models is considered to illustrate the features of dynamic stiffness-based optimal design technique proposed in this study.

  • PDF

Three-Dimensional Modelling and Sensitivity Analysis for the Stability Assessment of Deep Underground Repository

  • Kwon, S.;Park, J.H.;Park, J.W.;Kang, C.H.
    • Nuclear Engineering and Technology
    • /
    • 제33권6호
    • /
    • pp.605-618
    • /
    • 2001
  • For the mechanical stability assessment of a deep underground high-level waste repository. computer simulations using FLAC3D were carried out and important parameters including stress ratio, depth, tunnel size, joint spacing, and joint properties were chosen from sensitivity analysis. The main effect as well as the interaction effect between the important parameters could be investigated effectively using fractional factorial design . In order to analyze the stability of the disposal tunnel and deposition hole in a discontinuous rock mass, different modelings were performed under different conditions using 3DEC and the influence of joint distribution and properties, rock properties and stress ratio could be determined. From the three dimensional modelings, it was concluded that the conceptual repository design was mechanically stable even in a discontinuous rock mass.

  • PDF

일체형 순수유압식 브레이커의 민감도해석에 의한 성능 향상 (Performance Improvement of an Integrated-type Fully-Hydraulic Breaker by Sensitivity Analysis)

  • 최석;장효환
    • 유공압시스템학회논문집
    • /
    • 제6권1호
    • /
    • pp.17-24
    • /
    • 2009
  • The performance improvement of a small-size integrated-type fully hydraulic breaker is studied in this paper. Mathematical modeling of the breaker is established and verified by experiment. Through sensitivity analysis using AMESim, the key design parameters are selected and nearly optimized to maximize the impact energy as well as to improve the dynamic characteristics such as the piston upper chamber pressure, piston and valve displacements. As a result, the impact energy, blows per minute(bpm) and output power are increased by 52.9%, 1%, and 55.6%, respectively compared with the current design. The dynamic characteristics of the piston upper chamber pressure, piston and valve displacements are also improved by the design change.

  • PDF

매질 민감도해석을 이용한 전자기시스템의 위상 최적설계 (Topology Optimization of Electromagnetic Systems Using Material Sensitivity Analysis)

  • 변진규;최홍순;한송엽;박일한
    • 대한전기학회논문지:전기기기및에너지변환시스템부문B
    • /
    • 제54권4호
    • /
    • pp.163-173
    • /
    • 2005
  • The conventional optimization study for electromagnetic systems has been mostly on the shape or size optimization. The goal for these optimization methods is to improve performance of electromagnetic systems by optimizing the interface shape of two different materials while their given layout or initial topology are held. The feasible topology can be diverse and an appropriate topology will give much better design results. In this paper we propose a theory and an algorithm for topology optimization of electromagnetic systems, which are based on the finite element method. The topology optimization technique employes a direct searching method of sensitivity analysis in which the information of material sensitivity is used. Two numerical examples of a switched reluctance motor and an electrostatic actuator of MEMS are tested and their design results show that the optimization method is valid and useful for the topology and basic layout design of electromagnetic systems.

Sensitivity Study on SCR Design for Spread-Moored FPSO in West Africa

  • Yoo, Kwang-Kyu;Joo, Youngseok
    • 한국해양공학회지
    • /
    • 제31권2호
    • /
    • pp.111-120
    • /
    • 2017
  • It is generally acknowledged that the Steel Catenary Riser (SCR) is the most cost-effective riser type for deep-water offshore fields among various risers, including the SCR, flexible riser, and hybrid riser. However, in West Africa, the SCR type may not be suitable for FPSO systems because the large vertical motion of the floater brings about a considerable riser dynamic response. In this paper, an SCR system is designed for the FPSO in the West African field, where the use of a hybrid riser has been preferred. The proposed SCR configuration fulfills the design criteria of the API, such as the strength check and fatigue life. Moreover, a sensitivity analysis is also carried out to improve the certainty in the SCR design of a deep-water FPSO. The parameters affecting the strength and fatigue performance of the SCR are considered.

경량전철용 관절대차 현가요소의 민감도 해석 (Sensitivity Analysis of Suspension Elements of an Articulated Bogie for Light Railway Vehicles)

  • 한형석;허신;하성도;조동현
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 1998년도 추계학술대회 논문집
    • /
    • pp.421-428
    • /
    • 1998
  • Sensitivity analysis of suspension elements of an articulated bogie for light railway vehicles is presented. The ride, stability and safety are used as dynamic performance index. Suspension elements of 10 and a conicity of wheel are used as design variables, To analyze sensitivity of design variables, the railway vehicle dynamics analysis program AGEM is used. The results shows that the secondary suspension elements have a strong effect on ride and the primary suspension elements have a moderate effect on ride. Conicity of wheel has a strong effect on the stability, The safety is not effected by all the design variables.

  • PDF