• Title/Summary/Keyword: Design component

Search Result 3,829, Processing Time 0.036 seconds

Evaluation of chassis component reliability considering variation of fatigue data (피로 자료 분산을 고려한 자동차 부품의 신뢰도 해석)

  • Nam G.W;Lee B.C.
    • Proceedings of the Korean Society of Precision Engineering Conference
    • /
    • 2005.06a
    • /
    • pp.690-693
    • /
    • 2005
  • In this paper, probabilistic distribution of fatigue life of chassis component is determined statistically by applying the design of experiments and the Pearson system. To construct $p-\varepsilon-N$ curve, the case that fatigue data are random variables is attempted. Probabilistic density function(p.d.f) for fatigue life is obtained by design of experiment and using this p.d.f fatigue reliability about any aimed fatigue life can be calculated. Lower control arm and rear torsion bar of chassis component are selected as examples for analysis. Component load histories, which are obtained by multi-body dynamic simulation for Belsian load history, are used. Finite element analysis are performed using commercial software MSC Nastran and fatigue analysis are performed using FE Fatigue. When strain-life curve itself is random variable, probability density function of fatigue life has very little difference from log-normal distribution. And the case of fatigue data are random variables, probability density functions are approximated to Beta distribution. Each p.d.f is verified by Monte-Carlo simulation.

  • PDF

Analysis on Accuracy and Indigenity of Landscape Plants Species in Planting Design and Construction (식재설계 및 시공시 조경수종 사용에 있어서의 정확성과 자생성 분석)

    • Journal of the Korean Institute of Landscape Architecture
    • /
    • v.26 no.2
    • /
    • pp.251-258
    • /
    • 1998
  • The purposes of this study was to investigate accuracy and indigenity of landscape plant species in planting design and construction at housing complex and offer basic data for improving precision of planting construction. The scientific name of landscape plant species was described in planting drawings at only two sites among twelve survey sites. According to analysis on indigenity of plant species in planting drawings, it was found that the component ratio of foreign species was the highest and the component ratio of native species at public housing complex was the lowest. The component ratio of landscape plant species in planting construction was severely differed to that of planting drawings. Also the component ratio of cultivar was higher than that of planting drawings due to planting of sevveral cultivars for one species in planting drawings. In the result of accuracy analysis on landscape plant species in planting construction, it was found that mean ratio of inacccurate species was 33.2% at public housing complex, 29.6% at local company housing complex and 26.4% at nationwide company housing complex. It was found that several cultivars were planted for one species in planting drawings. The representative species which were planted by several cultivars were Camellia japonica, Rododendron spp., Prunus spp. and Magnolia spp. and so on. In order to promote the precision and speciality of planting design and construction, scientific and cultivar name of plants should be described in planting drawings.

  • PDF

Modal Parameter Sensitivity Analysis Using Component Mode Synthesis Method (부분 구조물의 모드 합성을 이용한 구조물 모드 매개변수의 민감도 해석)

  • 김형중;박윤식
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 1997.04a
    • /
    • pp.184-191
    • /
    • 1997
  • A method, termed as the substructural sensitivity synthesis method, which utilizes the computational merits of the component mode synthesis technique is proposed to calculate design sensitivity of modal parameters of substructurally combined structures. In this method, the sensitivity analysis is combined with component mode synthesis thchnique. thus the degrees of freedom of a combined structure can be dramatically reduced. Free-interface mode method including the residual attachment modes among the component mode synthesis methods is used to calculate the modal sensitivity of the combined structure. For the design sensitivities of modal properties of structure, the Nelson's method, which is exact solving method is used. It is shown that the modal sensitivities of the entire structure can be obtained by synthesizing the substructural modal data, and the sensitivities of the modal data about the design variables of modifiable substructure. Using the proposed method, the final degrees of freedom of entire structure can be remarkably reduced to calculate the modal parameter sensitivities. With a structure composed of beams and plates, as an example, the sensitivities of the eigenvalues and eigenvectors obtained by this proposed method were compared with the exact solutions in terms of accuracy.

  • PDF

The Study of Class Library Design for Reusable Object-Oriented Software (객체지향 소프트웨어 재사용을 위한 클래스 라이브러리 설계에 관한 연구)

  • Lee, Hae-Won;Kim, Jin-Seok;Kim, Hye-Gyu;Ha, Su-Cheol
    • The Transactions of the Korea Information Processing Society
    • /
    • v.6 no.9
    • /
    • pp.2350-2364
    • /
    • 1999
  • In this paper, we propose a method of class library repository design for provide reuser the object-oriented C++ class component. To class library design, we started by studying the characteristics of a reusable component. We formally defined the reusable component model using an entity relationship model. This formal definition has been directly used as the database schema for storing the reusable component in a repository. The reusable class library may be considered a knowledge base for software reuse. Thus, we used that Enumerative classification of breakdown of knowledge based. And another used classification is clustering of based on class similarity. The class similarity composes member function similarity and member data similarity. Finally, we have designed class library for hierarchical inheritance mechanism of object-oriented concept Generalization, Specialization and Aggregation.

  • PDF

A Watermarking Scheme of CAD Design Drawing Based on Line, Arc, and Polygon Face Components for Copyright Protection (저작권 보호를 위한 선, 호 및 다각형면 성분 기반의 CAD 설계도면의 워터마킹 기법)

  • Moon, Kwang-Seok;Lee, Suk-Hwan;Kwon, Seong-Geun;Kwon, Ki-Ryong
    • Journal of Korea Multimedia Society
    • /
    • v.10 no.5
    • /
    • pp.594-603
    • /
    • 2007
  • This paper proposes a watermarking scheme for 3D CAD design drawing. In the proposed scheme, we embed binary watermarks into line, arc, and polygon face components that are the basic component of 3D CAD design drawing. The embedding target component can be selected randomly among three components or by the component distribution in drawing. In line components, a watermark bit is embedded into the ratio of the length of a target line and an average length of lines that are connected into a target line. Furthermore, a watermark bit is embedded into a curvature radius on the basis of a center point in a arc component and also is embedded into a ratio of two sides in a polygonal face component. Experimental results verified that the proposed watermarking has the robustness against Format conversion, rotation translation, scaling, cropping, and layer cutting and also SNR of watermarked component is about 39.89-42.50 dB.

  • PDF

In Lighting Design, Space Accessibility of Vertical Elements of the Light (조명디자인에서 빛의 수직적 요소의 공간접근성)

  • Cha, In-Ho
    • Korean Institute of Interior Design Journal
    • /
    • v.24 no.4
    • /
    • pp.43-50
    • /
    • 2015
  • In lighting design and lighting in the light of how the physical space rather than the amount of light metering is implemented in the same space as horizontal illuminance and luminance study of the spatial analysis as a basis for improving the quality of scientific and cognitive aspects analyzed the vertical component of the light. Vertical component of the light and the ability to interpret the information space can be secured more easily sense the brightness of a small area compared to the horizontal components of electrical energy, due to the contrast between the dark and the surrounding induce customers to public facilities or commercial space The pedestrian aids to facilitate the determination of the copper. In addition, to secure the brightness of the overall sense of space allows to have a sense of comfort to lower the tension of the space. The vertical component of light also has a deep relationship to improving the quality of light in electrical energy savings increase the accessibility of space, space, nightscape in the humanities also contribute to environmental and looking for one trillion people in the city in terms of cultural development and identity There.

Collaboration Management Strategies and Product Development Performance (여러 공급업체와 공동개발에서의 협업전략과 제품개발 성과)

  • Hong, Yunsook
    • Journal of the Korean Operations Research and Management Science Society
    • /
    • v.39 no.3
    • /
    • pp.93-115
    • /
    • 2014
  • In collaborative product development with multiple suppliers, buyers must manage the suppliers' activities. This empirical research investigates the performance impacts of three strategies that buyers use to manage suppliers who design interdependent components. These strategies are: Instructionism (giving clear instructions to suppliers), Teaming (forming an interactive development team with suppliers), and Delegation (transferring component development responsibilities to suppliers). Data were collected through a cross-industry web-based survey of buying firms in manufacturing industries whose products require multiple, interdependent components. A path analysis utilizing 318 survey responses indicates that Instructionism has a positive effect on design quality, and Teaming has a positive effect on design quality and component innovation. The use of Delegation is not related to any of the performance indicators. The practical implication of this research for product development managers is that both Instructionism and Teaming can be effective strategies. For the purpose of assuring design quality, a buyer should give clear instructions in detailed specifications or work closely with suppliers in development teams. If competitive priority is product innovativeness, however, the buyer should work closely with its suppliers during component development processes using a Teaming strategy.

Analysis of impingement mixing for coating in injection mold (사출금형 안에서 코팅을 위한 충돌혼합에 관한 해석)

  • Kim, Seul-Woo;Lee, Ho-Sang
    • Design & Manufacturing
    • /
    • v.13 no.4
    • /
    • pp.1-9
    • /
    • 2019
  • In-mold Coating is a method that can simultaneously perform injection molding and surface coating in injection mold. The material used for coating is two-component polyurethane which is composed of polyol and isocyanate. L-type mixing head can be used to mix polyol and isocyanate uniformly, and inject them inside the mold cavity. The surface quality of the injection molded products by using in-mold coating depends on the mixing uniformity between main agent and hardener. In this study, flow analysis was performed to design a mixing head for uniform mixing of two-component polyurethane. Especially the effects of design parameters of mixing head on mixing uniformity and nozzle pressure were investigated. The parameters of mixing head were mixing chamber diameter, cleaning cylinder diameter, nozzle alignment angle in the horizontal and vertical direction, and cleaning piston position. It was found that optimal design values were mixing chamber diameter of 3.5 mm, cleaning cylinder diameter of 5.0 mm, nozzle horizontal/vertical alignment angles of 140°/160°, and cleaning piston position of 1.8 mm. The optimal values would be used to develop a two-component mixing head achieving an uniform mixing for in-mold coating.

A Study on the Preference for the Components of the Department Store Interior Design Image -Focusing on Women Customers Resident in Seoul- (백화점 실내디자인 이미지의 구성요소 선호도에 관한 연구)

  • 서종호;최상헌
    • Korean Institute of Interior Design Journal
    • /
    • no.9
    • /
    • pp.3-9
    • /
    • 1996
  • When a certain particular department store is chosen by customers due to the good image, the department store will have provided for the conditions that it can precede in competition with other department stores. Based upon it, a survey was made of preference for the department store interior design image component. In order to make the department store image better based upon this study results, the designer should remember that department store is possessed of display and circultation planinorder to give consume the good image. And , as a result of analyzing customers' preference for the details of the interior design image component, the area, primary components of the department store space, should take on specialization , though narrow. The circulation should constitute the free flow system. The ornamental illumination should be emphasized for the secondary component of the department store space. The color planing should be made that is oriented to seasonality and products. The floor should finished with wood. The department store interior should be decorated in a modern and simple form. The display of the department store should be made in a fashion that it takes on seasonality and artistry. These measures can be said to be the desirable method to provide a good image for women customers paying a visit to the department store.

  • PDF

Evaluation of an Abstract Component Model for Embedded Systems Development

  • Bunse, Christian;Choi, Yunja;Gross, Hans Gerhard
    • Journal of Information Processing Systems
    • /
    • v.8 no.4
    • /
    • pp.539-554
    • /
    • 2012
  • Model-driven and component-oriented development is increasingly being used in the development of embedded systems. When combined, both paradigms provide several advantages, such as higher reuse rates, and improved system quality. Performing model-driven and component-oriented development should be accompanied by a component model and a method that prescribes how the component model is used. This article provides an overview on the MARMOT method, which consists of an abstract component model and a methodology for the development of embedded systems. The paper describes a feasibility study that demonstrates MARMOT's capability to alleviate system design, verification, implementation, and reuse. Results indicate that model-driven and component-based development following the MARMOT method outperforms Agile development for embedded systems, leads to maintainable systems, and higher than normal reuse rates.