• 대한기계학회논문집A
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• 제28권7호
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• pp.885-895
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• 2004

Generally, automatic design is carried out with computer simulation and the simulation models are established by investigating the correlations between the simulation and real experiments. Therefore, the experiment results are utilized as complimentary data although they are considered to be precise. Orthogonal arrays have been adopted for discrete design. A method is proposed to directly exploit the experiment results in the design process with orthogonal arrays. Experiments are allocated to some rows of an orthogonal array and computer simulations are allocated to the others. A rule for the allocation is found to keep the orthogonality. Error analysis of the design results is performed. Mathematical examples are made to verify the validity of the proposed method. Error models are defined with the examples and the design solutions from the examples are discussed.

• 한국자동차공학회논문집
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• 제7권8호
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• pp.208-215
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• 1999

Using the orthogonal arrays and the occupant analysis software based on the multi-body dynamics , two interactive design algorithms are proposed to improve the initial design of the occupant protection systems. Algorithm 1 sequentially moves the narrow design space within the upper and the lower design limit. Algorithm 2 sequentially reduces the relatively wide design space. Each design algorithm is composed of two levels . The first level is to improve the characteristics of the crash performance considering the noise factors. In order to obtain the robust design, the second level reduces the variations the noise factors. In order to obtain the robust design, the second level reduces the variations due to the tolerance of the design variable. To utilize the algorithm 1, HIC(Head Injury Criterion) , 3 msec criterion value of the chest acceleration and the femur load decreased by 27.4%, 10.4% and 55.8%, respectively. To utilizer the algorithm 2 , the results decreased by 38.0%, 10.5% and 3.0% , respectively.

• 한국자동차공학회논문집
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• 제3권2호
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• pp.62-76
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• 1995

The safety analysis becomes very essential in the crash environment with the growth of automobile industry. Recently, an airbag system is required to protect the occupant. The effects of an airbag can be evaluated exactly from the barrier or sled test which is quite expensive. The airbag system in a passenger car is analyzed with the occupant analysis program. The modeling of the passenger car including an airbag is established and the results are verified by comparisons with real crash tests. However, the solution of an airbag design can not be obtained easily with the conventional method such as an optimization due to the nonlinearity and complexity of the problem. An iterative design algorithm using the orthogonal array is proposed to overcome the difficulties. The design trend of an airbag is recommended to minimize the injury of an occupant with the proposed design algorithm and the results are discussed.

• 한국정밀공학회지
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• 제23권8호
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• pp.119-126
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• 2006

Kriging model is widely used as design DACE(analysis and computer experiments) model in the field of engineering design to accomplish computationally feasible design optimization. In this paper, the optimization of gate valve was performed using Kriging based approximation model. The DACE modeling, known as the one of Kriging interpolation, is introduced to obtain the surrogate approximation model of the function. In addition, we describe the definition, the prediction function and the algorithm of Kriging method and examine the accuracy of Kriging by using validation method.

• 한국디자인학회:학술대회논문집
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• 한국디자인학회 2002년도 가을학술발표대회 디자인학 연구
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• pp.46-47
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• 2002

• 디자인학연구
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• 제16권3호
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• pp.183-190
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• 2003

산업디자인에서 디자인 대상에 대한 철저한 분석과 이해는 필수적인 선행요건이다. 그러나 디자인 프로세스에서 이러한 고려사항을 모두 충족시키고 우수한 제품을 디자인하기 위한 가이드가 되는 데이터를 얻기란 쉬운 일이 아니다. 이에 본 연구에서는 직교배열표를 이용하여 신뢰도를 높일 수 있는 산업디자인 기초모델을 제안한다. 특히 실험을 간편화하고 결과치의 유효성을 높이고자 하는 직교배열표 본래의 목적은 산업디자인 프로세스에서 충분히 달성함과 동시에, 디자인 프로세스의 동시화로 디자인 요소의 비정량적 데이터를 정량화하고 그에 대한 상호작용에 대해서 알아보았다. 이 방법은 또한 산업디자인에서 고려사항을 도출할 수 있는 방법을 제시함으로써 디자이너들이 제품개발에 있어서 더 완성도가 높은 제품을 개발할 수 있고, 데이터를 실증해 보임으로써 정확한 판단을 내리는데 도움을 줄 수 있다.

• 대한기계학회논문집B
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• 제37권2호
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• pp.125-130
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• 2013

TPMS(Tire pressure monitoring system)의 의무장착에 대한 법률개정에 따른 개발의 활성화를 토대로, WSN(Wireless Sensor Network)의 '설치하고 잊어버린다'는 기본 명제 하에, 차량수명과 동일한 성능의 배터리 대체용 에너지 하베스터에 대한 연구가 활발히 진행되고 있다. 본 논문은 자동차의 메커니즘적인 측면에서 가장 유용한 회전운동 성분을 이용하여 회전하는 휠과 고정된 브레이크 디스크 사이의 상대운동을 통한 전자기 유도방식 발전을 채택하였다. 휠 측에 구성된 코일과 브레이크 디스크에 매립된 자석의 다양한 배열과 코일 권선수 등을 설계변수로 잡고 직교배열표를 이용하여 최적의 조합을 찾아낸 후 실험을 통해 실제 축전되는 전기 에너지의 양을 측정하여 도출된 특성함수를 바탕으로 본 모듈의 타당성을 검증하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 추계학술대회 논문요약집
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• pp.69-69
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• 2003

• 한국자동차공학회논문집
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• 제14권4호
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• pp.123-131
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• 2006

The majority of pedestrian fatalities and injuries are caused by vehicle-pedestrian accidents. Recently, it has been recognized as a serious problem. Injuries of occupants in a vehicle have been decreased considerably. However, efforts for protection of pedestrians are still insufficient. These days, many advanced industries are striving for a better protection of pedestrians by using an active hood lift system, rather than reforming the existing structure. In this research, the active hood lift system is designed to enhance the performance for protection. The active hood lift system is analyzed by using the nonlinear finite element method. An optimization problem is formulated by incorporation of the analysis results. Orthogonal arrays are utilized to solve the formulated problem. An iterative optimization algothrithm using orthogonal arrays is utilized for design in the discrete space. It is found that the method can remarkably decrease the number of function evaluations.

• 대한기계학회논문집A
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• 제28권9호
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• pp.1399-1407
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• 2004

Structural optimization has been carried out in continuous design space or in discrete design space. Generally, available designs are discrete in design practice. However, the methods for discrete variables are extremely expensive in computational cost. An iterative optimization algorithm is proposed for design in a discrete space, which is called a sequential algorithm using orthogonal arrays (SOA). We demonstrate verifying the fact that a local optimum solution can be obtained from the process with this algorithm. The local optimum solution is defined in a discrete design space. Then the search space, which is a set of candidate values of each design variables formed by the neighborhood of a current design point, is defined. It is verified that a local optimum solution can be found by sequentially moving the search space. The SOA algorithm has been applied to problems such as truss type structures. Then it is confirmed that a local solution can be obtained by using the SOA algorithm