• 한국산학기술학회논문지
• /
• 제11권4호
• /
• pp.1171-1177
• /
• 2010

본 논문은 직교배열실험에 기반한 'Pick-the-Winner'법과 설계공간축소법에 기초하여 사출성형 제품의 휨을 잡음(noise)의 존재 하에서도 최소화할 수 있는 강건설계 절차를 제시한다. 강건설계는 현실적 요구를 반영하여 두 단계의 이원적 최적화 과정, 즉 제품 형상에 대한 강건설계와 공정조건에 대한 강건설계로 이루어진다. 제안한 강건설계 절차를 사각형 박막 제품의 설계에 적용한 결과, 본 강건설계법이 현실적 효용성이 있음을 확인하였다.

• 한국기계가공학회지
• /
• 제7권1호
• /
• pp.53-61
• /
• 2008

In this research, the layout and geometry of U-type ribs in the part, including significant process conditions, are automatically optimized to reduce part warpage with robustness in consideration. The optimization procedure are based on an iterative redesign methodology integrated with computer aided injection molding simulation, Taguchi's Design of Experiment(DOE), and a direct search-based optimization method. The robustness of a design alternative is efficiently measured by introducing composite noise factor and Taguchi's signal-to-noise ratio. As a solution search methodology, the modified design space reduction method based on orthogonal arrays is employed to exploit an optimal robust design alternative. To illustrate the proposed methodology, a case study is performed on simulation results, where an optimal robust design alternative is obtained with a moderate number of iterations.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제53권8호
• /
• pp.463-468
• /
• 2004

This paper was applied space harmonic method as a characteristic analysis technique for slotless PMLSM. There is advantages of active response to the change of design parameters as well as reduction of the calculation time. The method can be overcome disadvantages of finite element analysis that needs long times calculation, repetitions of pre and post-process. In this paper, 3D-space harmonic method was applied to consider the precise description of end turn coil shape and the changes of characteristic according to changes of length of z-axis direction. The thrust of optimal design was performed using genetic algorithm to enhance the thrust which is the disadvantage of slotless type PMLSM. For design parameters, width of permanent magnet, width of coil, width of coil inner and lengths of z-axis direction were selected. For objective functions. thrust per weight. thrust per volume. multi-objective function was selected.

• KIEAE Journal
• /
• 제16권6호
• /
• pp.77-82
• /
• 2016

Purpose: Almost every research carried out in our country against the natural disaster is focused on the temporary facilities such as temporary housing, emergency shelter and as a result, it is very hard to find out researches on the ordinary houses which installed integrated systems of hazard-resistant against the natural disaster. Method: To conduct this research, categorizing process for design, structural, environmental and installation elements found in the Hazard-Resistant and Reduction House built for sale in Japan was performed. Result: In this study, several design concepts and subordinate items are recommended for hazard-resistant housing. First, design concept of 'Preparedness' which means security and access to the storage storing goods especially food & beverage for the emergencies is needed. The subordinate items consist of security of stocking space, diversified and circular storage system, and safety storage system. Second, design concept of 'Security' which means security of physical safety space and rapid recovery to returning to daily life against natural disaster is needed. The subordinate items consist of many items including not only structure and facilities but also architectural design method. And finally, design concept of 'Maintenance, Support and Return' which means minimizing the physical and psychological damages and support safety and physical conditions of the victims from the impact of the disaster to returning to daily life is needed. The subordinate items consist of high efficiency insulation/airtightness design, microclimate design, combination of photovoltaic system and storage battery, non-power appliance system against the power failure, storing system for drinking water, rainwater storing and utilization system.

• International Journal of Automotive Technology
• /
• 제6권6호
• /
• pp.635-641
• /
• 2005

This paper presents an ASF (Aluminum Space Frame) BIW (Body in White) optimal design, which minimizes weight and satisfies multidisciplinary constraints such as static stiffness, vibration characteristics, low-/high-speed crash, and occupant safety. As only one cycle CPU time for all the analyses is 12 hours, the ASF design having 11-design variable is a large scaled problem. In this study, ISCD-II and conservative least square fitting method were used for efficient RSM modeling. Likewise, the ALM method was used to solve the approximate optimization problem. The approximate optimum was sequentially added to remodel the RSM. The proposed optimization method uses only 20 analyses to solve the 11-design variable problem. Moreover, the optimal design can achieve $15.6\%$ weight reduction while satisfying all the multidisciplinary design constraints.

• 한국항공우주학회지
• /
• 제41권12호
• /
• pp.940-949
• /
• 2013

본 논문에서는 삼각형 태양돛의 주름저감설계 방안에 대한 연구를 수행하였다. 태양돛 멤브레인에 부분적으로 발생하는 주름으로 인하여 구조물의 추력성능과 제어성능에 영향을 받을 수 있으므로 멤브레인에 발생하는 주름을 감소시키거나 제거하는 것은 매우 중요하다. 주름을 저감하는 방법으로 태양돛 멤브레인과 붐을 연결하는 케이블의 하중의 각도를 조정하는 방식, 현수선 방식 및 현수선-와이어 방식을 고려하였으며 매개변수 연구를 통하여 주름저감효과에 대해 체계적으로 조사하였다.

• 대한기계학회논문집A
• /
• 제30권5호
• /
• pp.595-601
• /
• 2006

Design space optimization using design space adjustment and refinement is used to optimize a knuckle in the suspension system of an automobile. This approach is a new efficient method for large-scale topology optimization by virtue of two reasons. First, design space adjustment including design space expansion and reduction is suitable for large-scale problems. Second, the design space refinement can be done globally or locally where and when necessary and thus is very effective in obtaining a target resolution with much less number of elements. Compliance minimization for a knuckle is considered with a realistic working condition to show the effectiveness and superiority of the new approach.

• 소성∙가공
• /
• 제9권5호
• /
• pp.512-525
• /
• 2000

Designers are frequently faced with multiple quality issues in injection molded parts. These issues are usually In conflict with each other, and thus tradeoff needs to be made to reach a final compromised solutions. The objective of this study is to develop an automated injection molding design methodology, whereby part defects such as warpage and weld line are optimized. The features of the proposed methodology are as follows: first, Utility Function approach is applied to transform the original multiple objective problem into single objective problem. Second is an implementation of a direct search-based Injection molding optimization procedure with automated consideration of process variation. The Space Reduction Method based on Taguchi's DOE(Design Of Experiment) is used as a general optimization tool in this study. The computational experimental verification of the methodology was partially carried out for a can model of Cavallero Plastics Incorporation, U. S. A. Applied to production, this study will be of immense value to companies in reducing the product development time and enhancing the product quality.

• 한국실내디자인학회논문집
• /
• 제23권6호
• /
• pp.78-86
• /
• 2014

Lighting in indoor space is being changed to system lighting converged with IT technology. Office space lighting with incandescent lamps and fluorescent lamps was completed through overall lighting plan by illumination in most cases, but convergence between LED lighting and IT technology enables the technology of responding to user requirements to be realized. Optical physical quantity suitable for humans and the lighting environment in accordance with user's sensibility, based on space function and user's behavior, would contribute to the improvement of service productivity, energy reduction, and enhancement of emotional satisfaction by providing user optimized lighting solution. Thus, user-customized system lighting guidelines to be applied with integration indicators of optics and sensibility are required. For the design elements required by users, environmental factors, product characteristics, optical characteristics, and sensibility factors are drawn from the design cases for office space and the survey, and the design check list and evaluation indicators are considered to reflect the requirements in the design and requirement indicators to give integrated satisfaction for optics and sensibility are developed. Purpose-centered design method from the user's viewpoint is applied to function-focused design through scenario, and it should be applied flexibly, as the new lightning design method solutions, to the concept design stage of space lighting design and device development. This paper, therefore, presents user-customized guidelines by pursuing the optics and sensibility evaluation and design method combining the requirement conditions and scenario, to be used for lighting content development and design.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2004년도 추계학술대회 논문집
• /
• pp.334-341
• /
• 2004

This study is to establish design method and evaluation technology for drive system appropriate to high speed tilting train. The transmission system of high speed train serves in the severe condition compared with those of KHST(G7), namely, they have to transmit high power to run with high speed and they have to make maximum use of the limited space. This paper reports the reviews and results of the design and evaluation method for reduction gearbox of high speed tilting train and discusses various design items and methods about assembly and parts of reduction gearbox.