• Title, Summary, Keyword: Design Characteristic

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Computationally Effective Optimization of Hybrid Vehicle Powertrain Design Using Characteristic Loss Evaluation (특성 손실 평가를 통한 하이브리드 자동차 동력전달장치의 빠른 설계 최적화)

  • Park, Seho;Ahn, Changsun
    • Transactions of the Korean Society of Automotive Engineers
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    • v.23 no.6
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    • pp.591-600
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    • 2015
  • The efficiency of a powertrain system of hybrid vehicle is highly dependent on the design and control of the hybrid powertrain system. In other words, the optimal design of the powertrain systems is coupled with optimal control of the powertrain system. Therefore, the solution of an optimal design problem for hybrid vehicles is computationally and timely very expensive. For example, dynamic programming, which is a recursive optimization method, is usually used to evaluate the best fuel economy of certain hybrid vehicle design, and, thus, the evaluation takes tens of minutes to several hours. This research aims to accelerate the speed of efficiency evaluation of hybrid vehicles. We suggest a mathematical treat and a methodological treat to reduce the computational load. The mathematical treat is that the dynamics of system is discretized with sparse sampling time without loss of energy balance. The methodological treat is that the efficiency of the hybrid vehicle is inferred by characteristic loss evaluation that is computationally inexpensive. With the suggested methodology, evaluating a design candidate of hybrid powertrain system is taken few minutes, which was taken several hours when dynamic programming is used.

Characteristic Analysis of Housing Design of Michael Graves - As the generation passes - (마이클 그레이브스의 주택 디자인 특성 - 시대적 흐름 배경중심으로 -)

  • Shin Kyung-Joo;Jeon Lea-Jin;Noh Sang-Wan
    • Korean Institute of Interior Design Journal
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    • v.14 no.2
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    • pp.3-11
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    • 2005
  • The subject of this paper is to find out the characteristics of Michael Graves' housing design. I collected the information of his designs and teamed his design language through his works on different time. I chose five actual housings for analysis which were built since 1960 when he have started his career. Though analysis of the exterior view, plane figures and the total arrangement photos, I could reached the conclusion. From analysis of this research I could figure out the characteristic of Michael Graves housing design as follows. During his whole working career $(1960\~present)$, his design style has went through distinctive characteristic changes that can be divided into: 1960s to early 1970s, mid and late 1970s, 1980s to as of now. 1960s to early 1970s, during this period his works implicated transparency, openness, consistency, complication, and contrast on space, abstraction, white-color and metaphor. mid and late 1970s, showed the white-color figure put together with geometrical structure and post-modernism styles such as ornamentation, natural and metaphor. 1980s to as of now, implicated ornamentation, natural features, historic background, interconnections, variety, symbolism and tradition.

Optimal Performance Design for Concrete Median Barrier with Crashworthiness Analysis (차량 충돌 해석을 통한 중앙분리대의 최적 성능 설계)

  • 한석영;고성호;최형연
    • Transactions of the Korean Society of Automotive Engineers
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    • v.10 no.1
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    • pp.168-178
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    • 2002
  • The purpose of this study is to develop an optimal performance design ova concrete median barrier using the design of experiment and crash simulation which is done by Pam-Crash, one of the commercial crash simulation software. A formula of characteristic value was suggested to obtain an optimal performance design considering all of von Mises stress, volume and acceleration at center of gravity of a heavy truck. An optimal design of a concrete median barrier was obtained by the analysis of variance based on design of experiment and crash simulation. A crash simulation with the optimal design was accomplished in order to verify the suitability of the suggested formula and the proper application of the design of experiment. The obtained optimal design was satisfied for a domestic design regulation of a concrete median barrier.

A Study on Design Style (디자인 양식에 관한 고찰)

  • 이재국
    • Archives of design research
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    • v.20
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    • pp.25-36
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    • 1997
  • Design style is studied to examine the design essence more clearly which is revealed as a formative substance. First of all, every effort can be made to understand the peculiar characteristic of design style by considering the linguistic source and meaning of design style. On the basis of this, picturesque style, mechanical style and expressive style are searched to establish the types of design style, inspect the every style's characteristic and focus on revealing the relations between the creation of design value and the style. Finally, changing factors of design style is researched to suggest the effect and direction of design development.

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Multi-Characteristic Robust Design Methodology Based on Designer's Preference (설계자 선호도를 고려한 다특성 강건설계법)

  • 김경모
    • Journal of the Korean Society for Quality Management
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    • v.29 no.1
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    • pp.47-61
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    • 2001
  • The ever increasing demands for enhanced competitiveness of engineered products require a "designing-in-quality" strategy that can effectively and efficiently incorporate multiple design objectives into design. Robust design can be viewed as a multi-characteristic design problem requiring tradeoffs between mean and variance characteristics. Firstly this paper analyzes the intrinsic preference of the traditional SN ratio on mean and variance, and secondly presents a new design metric for a robust design using concepts from utility theory to accurately capture designer′s intent and preference on mean and variance. The steps to apply the proposed design metric as the robust design criterion in an orthogonal array based engineering experimentation is presented with the aid of a demonstrative case study. The performance of the proposed design metric is tested, and the results are discussed.

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Optimization of Injection Molding Design Using Two-Characteristic Value Function Methodology (두 특성의 가치함수를 이용한 사출성형의 최적 설계)

  • Park, Jong-Cheon;Kim, Kyung-Mo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.1
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    • pp.36-43
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    • 2015
  • Optimizing multiple design characteristics which are usually in conflict with each other in the injection molding process is frequently becoming a critical problem for designers who work in this area. The purpose of this work is to develop an automated design methodology for optimizing two such design characteristics found in injection-molded parts. A value function based on decision-making theory is used as a means of evaluating the performance of a two-characteristic design alternative. Also, a design space reduction algorithm based on Taguchi's orthogonal arrays is utilized to discover an optimal design alternative. Verification of the developed design methodology is carried out for an actual model with two design characteristics, the weld line and the gate location, to be optimized in computer simulation experiments.

A Study on the characteristics of Philippe Starck's furniture design (필립 스탁의 가구디자인 특성에 관한 연구)

  • Park, So-La
    • Korean Institute of Interior Design Journal
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    • v.17 no.1
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    • pp.162-169
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    • 2008
  • Philippe Starck is a famous french designer known for his creative works in all aspects of life from architectural space to product design. Especially, in regard to furniture, he designed more than 250 works with various design characteristics. This study therefore aims to examinate the characteristics of furniture designed by Philippe Starck through assessment of his design background and philosophy, evaluation of fifty or so of his works in terms of their function, form, material, and emotions, and lastly through a chronological analysis. As a result from this study, following various results are drawn as design characteristic through forty six representative cases: 1) possibility of fabrication and transformation 2) multi-function or optional function for user 3) pursuit of simplicity using the characteristic of singular material or mono block and immateriality 4) emotional approach in design 5) non-design method such as use of archetype or historical form.

A Study on Expression Method and Characteristic of Transparency of the Surface in Current Commercial Space (현대 상업건축공간에 있어서 표피의 투명성 표현방법과 이미지 특성에 관한 연구)

  • Park Chan-Il;Cho Mi-Na
    • Korean Institute of Interior Design Journal
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    • v.14 no.6
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    • pp.66-74
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    • 2005
  • The purpose of this study analyzes an expression method and a characteristic of transparency of a surface in commercial space, and it is to show an index of a surface design. We did image evaluation by SD method for the commercial space which directed transparency to a surface as the method. We used a factor analysis and cluster analysis to get the image characteristic and type of the expression methods. As a result, we got six following expression methods and design indexes. (1) Transparency expression of a surface by a multiple layer. (2) Transparency expression of a surface by unification with a structure. (3) Transparency expression of a surface by transparency of materials. (4) Transparency expression of a surface by a combination of various materials. (5) Transparency expression of a surface by unification of the image media. (6) Transparency expression of a surface by transparency transformation of materials. We think that it will be able to make use of these results as a design index for the surface design of a commercial space in the future.

A Study On the Frequency Characteristic of the HBPSRC (하프 브릿지 병렬-직렬 공진형 컨버터의 주파수 특성에 관한 연구)

  • 차인수;박해암
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • pp.51-55
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    • 1992
  • By using the state plane approach, the steady state analysis and design of a half bridge parallel-series (LLC-type) resonant converter (HBPSRC) operating in the continous conduction made is presented. The state-plane diagram representation of the converter response gives good insight into the converter operation. Based on this analysis, a set of steady state characteristic waves for HBPSRC is presented. A simple design procedure is given and design example for a 100watts, 30KHz HBPSRC is presented for illustrative purposes.

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A Study on the Flexible Application of Ethnographic User Research according to characteristic variables of Design Project (디자인 프로젝트의 특성에 따른 가변적 에쓰노그래픽 리서치 활용에 관한 연구)

  • 김현정;이건표
    • Proceedings of the Korea Society of Design Studies Conference
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    • pp.18-19
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    • 2000
  • 인간 중심의 디자인을 노력의 일환으로 최근 여러 디자인 프로젝트에서 에쓰노그래픽 사용자 리서치의 방법을 적용하고 있다. 에쓰노그래픽 리서치 방법의 정수는 디자인 될 결과물 지향에서 벗어나, 현장에서 사용자가 실제로 무엇을 하는가에 대한 사람들의 경험에 리서치의 초점을 맞추는 것이라고 할 수 있을 것이다. (중략)

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