• Title/Summary/Keyword: Component Design

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Sensitivity Analysis of Linear Elastic Problem due to Variations of the Traction Boundary Conditions (하중경계조건의 변화에 대한 선형탄성문제의 민감도 해석)

  • 이태원
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.15 no.6
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    • pp.1852-1860
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    • 1991
  • A shape design sensitivity of the elastic deformation due to a change of traction boundary condition is presented. The solution of governing equations for a linear elasticity problem is obtained by finite element method and the traction boundary is defined by design variables. The performance functional to be considered involves both the domain and boundary integral. Variations of geometry can be defined as design velocity. Using material derivative concept and adjoint equations, the design sensitivity is derived by Lagrange multiplier method. For a given geometry of a structure, the change of traction boundary is described by the tangential component of the design velocity only. The final result for the shape design sensitivity is formulated as the boundary integral form, the integrand is defined by tangential component of design velocity and first order derivatives of parameters. Numerical implementation of design sensitivity is discussed and is compared with the difference of the actual values.

A least component size design of PV-Wind Hybrid System (태양광.풍력 복합발전 시스템의 최적용량 선정)

  • Yu, Gwon-Jong;Song, Jin-Soo;Noe, Myong-Gun;Sung, Se-Jin
    • Proceedings of the KIEE Conference
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    • 1997.07f
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    • pp.1939-1941
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    • 1997
  • In this paper, we simulated the performance of the Cheaju island and developed the hybrid power system based on a least component size design option. This paper performed simulation of economic relation of battery and diesel generation in hybrid power system component.

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Topology Optimization of Cylinder Block using Component Mode Synthesis (구분모드합성법을 이용한 실린더블록의 위상 최적 설계)

  • 윤성호;윤영근
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.3
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    • pp.177-183
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    • 2003
  • Vibration analysis using component mode synthesis method was carried out to identify that to some extent each component contributed to the whole vibration of a powertrain consisting of several components. This analysis helped decide the component to be modified to reduce the powertrain weight, without degrading its current vibration characteristics. As a result, a cylinder block was chosen as a redesign object. Topology optimization analysis was performed to design the topology of the cylinder block whose flange connected with the transmission was chosen to be the design domain. After all, a new prototype of cylinder block was manufactured based on the analysis results for the verification experiment. It was confirmed from the analytical and experimental results that u optimally designed cylinder block had an advantage over the current one in the powertrain weight, with the powertrain vibration characteristics improved slightly.

Effects of the Component Structures on the Vibration of the Total system Using Design Sensitivity Analysis (설계 민감도를 이용한 부분 구조물의 기여도 분석)

  • Lee, Sun-Byung;Yim, Hong-Jae;Kim, Hyo-Sik
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.533-539
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    • 2001
  • In this research, design Sensitivity Analysis is presented for commercial vehicle such as large scale structural system. The proposed method is based on vibration analysis of the total structure and design sensitivity to identify the contribution factor of the component structure to the total system structure. In addition, approximated equations derived from response surface method are used for representative section properties of the thin walled beams.

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Design of sensing element for 3-component load cell using parallel plate structure (병렬판구조를 이용한 3분력 로드셀 감지부의 설계)

  • Kim, Gap-Sun;Kang, Dae-Im;Jeong, Su-Yeon;Joo, Jin-Won
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.21 no.11
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    • pp.1871-1884
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    • 1997
  • This paper describes the design process of a 3-component load cell with a multiple parallel plate structure which may be used to measure transverse forces and twisting moment simultaneously. Also we have derived equations to predict the bending strains on the surface of the beams in the multiple parallel plate structure under transverse force or twisting moment. It reveals that the bending strains calculated from the derived equations are in good agreement with the results from finite element analysis and experiment. Also we have evaluated the rated output and interference error of each component, which can be efficiently used to design a 3-component load cell with a multiple parallel plate structure.

Short Humeral Stems in Shoulder Arthroplasty

  • Oh, Hwang Kyun;Lim, Tae Kang
    • Clinics in Shoulder and Elbow
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    • v.21 no.2
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    • pp.105-110
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    • 2018
  • Since the introduction of shoulder arthroplasty by Neer in 1974, the design of not only the glenoid component but also the humeral component used in shoulder arthroplasty has continually evolved. Changes to the design of the humeral component include a gradually disappearing proximal fin; diversified surface finishes (such as smooth, grit-blasted, and porous coating); a more contoured stem from the originally straight and cylindrical shape; and the use of press-fit uncemented fixation as opposed to cemented fixation. Despite the evolution of the humeral component for shoulder arthroplasty, however, stem-related complications are not uncommon. Examples of stem-related complications include intraoperative humeral fractures, stem loosening, periprosthetic fractures, and stress shielding. These become much more common in revision arthroplasty, where patients are associated with further complications such as surgical difficulty in extracting the humeral component, proximal metaphyseal bone loss due to stress shielding, intraoperative humeral shaft fractures, and incomplete cement removal. Physicians have made many attempts to reduce these complications by shortening the stem of the humeral component. In this review, we will discuss some of the limitations of long-stem humeral components, the feasibility of replacing them with short-stem humeral components, and the clinical outcomes associated with short-stemmed humeral components in shoulder arthroplasty.

Component Sizing for Development of Novel PHEV System (신 개념 PHEV 시스템 개발을 위한 동력원 용량 설계)

  • Lee, Heeyun;Kang, Changbeom;Kim, Jinseong;Cha, Suk Won;Park, Yeong-il
    • Transactions of the Korean Society of Automotive Engineers
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    • v.24 no.3
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    • pp.330-337
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    • 2016
  • In this paper, component sizing and analysis of the novel plug-in hybrid electric vehicle powertrain configuration is conducted. Newly proposed powertrain configuration in prior study has an internal combustion engine and two electric motors. To optimize component size of the vehicle system and reduction gear ratio, component sizing methodology is proposed and conducted. Required power for vehicle's dynamic performance is calculated to decide minimum power requirement of powertrain component combination. Component size of engine and electric motor are optimized using vehicle simulation to maximize fuel economy performance. Optimized powertrain configuration and vehicle simulation results present validation of newly proposed vehicle system.

The Optimum Design Study of Asymmetric Layered Ceramic Component by Spherical Indentation (구형 인덴테이션 평가에 의한 비대칭적 층상형 세라믹 부품의 설계연구)

  • Lee, Kee-Sung;Kim, Tae-Woo;Kim, Chul
    • Proceedings of the KSME Conference
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    • 2004.11a
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    • pp.297-301
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    • 2004
  • The optimum design against contact crack initiation is investigated to find major parameters in designing desirable surface-coated asymmetric layered components. Hard ceramic coated soft materials with various elastic modulus mismatch are prepared for the analysis. Spherical indentation is conducted for producing contact cracks from the surface or interface between the coating and the substrate layer. A finite element analysis of the stress fields in the loaded layer components enables a direct correlation between the damage patterns and the stress distributions. Implications concerning the design of asymmetric layered components indicate that the coating thickness and the elastic modulus mismatch are important parameters for designing layered component to prevent the initiation of contact cracks.

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Ergonomic approach of the Mini-componnt for a mew gereration (신세대를 위한 미니컴포넌트의 인공학적 접근)

  • 권영국;김재형;김동욱
    • Proceedings of the ESK Conference
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    • 1995.10a
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    • pp.240-248
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    • 1995
  • In Korea, it is not satisfactory in the product design since Kansei engineering or Ergnomics is not very active and well considered. When designing a mini-component, the user's emotion was not considered well. It is typical to have a rectangular shape, dark- colored outside in a mini-component design. Therefore, the users have to select with available choice from the manufacture's traditional designs. In this study, a new smin- component was designed to be suitable for a new generation's (10 to mid-20) sensation. First of all, an ergonomic problems were investigated. And then, the survey was per- formed to consider the emotion of the new generation. After that, the new design was made to reflect the new generation's trend and preference. In addition, the high-touch (human-centered design) and human touch (the product to give a sensible satisfaction for human) concepts were added.

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Use of Factor Analyzer Normal Mixture Model with Mean Pattern Modeling on Clustering Genes

  • Kim Seung-Gu
    • Communications for Statistical Applications and Methods
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    • v.13 no.1
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    • pp.113-123
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    • 2006
  • Normal mixture model(NMM) frequently used to cluster genes on microarray gene expression data. In this paper some of component means of NMM are modelled by a linear regression model so that its design matrix presents the pattern between sample classes in microarray matrix. This modelling for the component means by given design matrices certainly has an advantage that we can lead the clusters that are previously designed. However, it suffers from 'overfitting' problem because in practice genes often are highly dimensional. This problem also arises when the NMM restricted by the linear model for component-means is fitted. To cope with this problem, in this paper, the use of the factor analyzer NMM restricted by linear model is proposed to cluster genes. Also several design matrices which are useful for clustering genes are provided.