손실함수를 활용한 Grey Relational Analysis 기반 다특성 공정의 최적화 = Optimization of Multi-Characteristic Process Based on Grey Relational Analysis Using Loss Function

다국어 초록 (Multilingual Abstract)

Multi-characteristic optimization problem is frequently confronted in modern industries due to the customer’s various requirements on the products and services. Because of multi-characteristics’ interrelation, however, it is not easy to satisfy them all at the same time. There are several approaches developed to solve this problem and Grey relational analysis is among them.

Grey relational analysis method transforms, like the other optimization methods for multi-characteristic situation, the influences of factors on multiple characteristics into the same scaled measures. And then it optimizes the objective function of univariate characteristic derived from multiple characteristics interrelations. In the Grey relational analysis procedure, the compatibility sequence is usually obtained as the linear function of the distance between the value of quality characteristic and its target. As is known Taguchi’s quadratic loss, the quality loss increases as the value of quality characteristic is getting off the target. And therefore, it can be applied to obtain the comparability sequence of Grey relational analysis.

In this thesis, the optimization of multi-characteristic process based on Grey relational analysis using Taguchi’s quadratic loss function is considered. And the case study of the grinding process of aircraft engine bushing is given to show the efficiency of newly proposed Grey relational analysis for optimizing multi-characteristic process. The results of process capability analyses for both Grey relational analyses are compared and the newly proposed Grey relational method can be efficient for certain situations.

목차 (Table of Contents)

• 목 차
• I. 서론
• 1. 연구 배경 및 문헌 조사
• 2. 연구 방법 및 범위
• II. 손실함수를 활용한 Grey Relational Analysis 기반 공정의 다특성 최적화
• 1. Grey Relational Generation
• 2. Grey Relational Coefficient Calculation
• 3. Grey Relational Grade Calculation
• 4. 다특성 공정의 최적화
• III. 항공기 엔진용 Bushing 연마 공정의 최적화 사례
• 1. 항공기 엔진용 Bushing 연마 공정
• 2. 직교배열표를 이용한 실험계획 및 Data 수집
• 3. 손실함수를 고려한 Grey Relational Analysis 기반 Bushing 연마 공정의 다특성 최적화
• 4. 최적공정조건의 비교 분석
• IV. 결론
• 참고문헌
• Abstract