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선형 등가정하중을 이용한 비선형 거동 구조물의 최적설계(Ⅱ) - 구조예제 -
박기종(Ki-Jong Park),박경진(Gyung-Jin Park) 대한기계학회 2005 大韓機械學會論文集A Vol.29 No.8
In part I of this paper Nonlinear Response Optimization using Equivalent Static Loads (NROESL) method/algorithm is developed to conduct optimization for nonlinear behavior structures. The method/algorithm is also verified to show its convergency and optimality. In this present paper, the NROESL algorithm is applied to several structural problems with geometric and/or material nonlinearity. Conventional optimization with sensitivity analysis using the finite difference method is also applied to the same examples. The results of the optimizations are compared. The proposed method is very efficient and derives good solutions.
마찰면압 및 온도 특성을 고려한 수동변속기 싱크로나이저 링의 개발
박기종(Ki-Jong Park),임채홍(Chaehong Lim),김정준(Jungjune Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The frictional surface pressure and temperature on a synchronizer ring are the most important factors in the manual transmission synchronizer system in terms of its functionality and durability aspect. In initial design stage, a practical analysis procedure is developed to predict the effects of the surface temperature or pressure on the synchronizer ring. The stress analysis. thermal analysis and their coupled analysis are involved in the process. According to the procedure. the analyses are performed and the results are discussed. PV value of the theory about energy loss rate is introduced to understand the frictional surface pressure. Shape optimization of the synchronizer ring is also carried out to minimize the PV value on the contact surface between a synchronizer ring and cone. The optimization results are discussed.
등가정하중을 이용한 비선형 거동 트러스 구조물의 최적설계
박기종(Ki-Jong Park),박경진(Gyung-Jin Park) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
A numerical method and algorithms is proposed to perform optimization of non-linear response structures. An analytical and numerical method based finite element method is also proposed for the transformation of non-linear response into linear response. Loads transformed from this method are defined as the equivalent linear loads. With the loads and the transformed response, linear static optimization is performed for nonlinear response structure with geometric and/or material non-linearity. The results of the optimization are compared with them of typical non-linear response optimization using finite difference method. The proposed method is very efficient and derives good solution.
동하중으로부터 변환된 등가정하중을 통한 구조물의 형상최적설계
박기종(Ki-Jong Park),이종남(Jong-Nam Lee),박경진(Gyung-Jin Park) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In structural optimization, static loads are generally utilized although real external forces are dynamic.<br/> Dynamic loads have been considered in only small-scale problems. Recently, an algorithm for dynamic<br/> response optimization using transformation of dynamic loads into equivalent static loads has been proposed.<br/> The transformation is conducted to match the displacement fields from dynamic and static analyses. The<br/> algorithm can be applied to large-scale problems. However, the application has been limited to size<br/> optimization. The present study applies the algorithm to shape optimization. Because the number of<br/> degrees of freedom of finite element models is usually very large in shape optimization, it is difficult to<br/> conduct dynamic response optimization with the conventional methods that directly threat dynamic response<br/> in the time domain. The optimization process is carried out via interfacing an optimization system and an<br/> analysis system for structural dynamics. Various examples are solved to verify the algorithm. The results<br/> are compared to the results from static loads. It is found that the algorithm using static loads transformed<br/> from dynamic loads based on displacement is valid even for very large.scale problems such as shape<br/> optimization.