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레벨셋법과 페이즈 필드 모델을 이용한 가동코일형 리니어 액추에이터 최적설계
임성훈(Sunghoon Lim),오세안(Seahn Oh),민승재(Seungjae Min),홍정표(Jung-Pyo Hong) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
가동코일형 리니어 액추에이터는 다른 형식의 액추에이터에 비해 구조가 간단하고 제어가 용이하여 다양한 산업 분야에 활용되고 있다. 본 연구에서는 리니어 액추에이터의 가동 특성을 향상시키기 위해 가동자의 모든 동작점에서의 추력을 반영한 목적 함수를 구성하고 최적설계 문제를 정식화하여 최적화룰 수행하였다. 또한, 최종형상의 명확한 추출을 위해 레벨셋 함수를 설계변수로 설정하여 최적설계를 진행하고 성능과 생산성을 동시에 만족하는 액추에이터를 설계하기 위해 페이즈 필드 모델의 개념을 최적설계에 적용하여 최종형상의 단순화를 고려하였다. 제안한 기법의 효용성을 확인하기 위해 액추에이터 진동과 소음의 원인인 추력의 변동폭을 최소화하기 위한 코어 설계를 수행하여 추력의 변동을 감소시킬 수 있는 최적 형상을 제시하였고 복잡도 계수에 의한 최종 형상의 단순화도 확인하였다. A moving-coil type linear actuator has been widely used in the system reciprocating short stroke because of its several advantages, such as the structural simplicity, low weight and a fast control response speed. This paper presents a design approach for improving the actuating performance with a clear expression of optimal configuration represented by a level set function. The optimization problem is formulated to minimize the variation of magnetic force at every moving displacement of the mover for fast and easy control. To consider the manufacturability of actuator, the concept of phase-field model is incorporated to control the complexity of structural boundaries. To verify the usefulness of the proposed method, the core design example of cylindrical linear actuator is performed.
용접면적 최소화를 위한 다중물질 차체구조의 위상최적설계
임성훈(Sunghoon Lim),민승재(Seungjae Min) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper presents a new design optimization method that is applicable to design the vehicle body structure with multi-material. Two different level set functions are employed to express the properties of steel and aluminum in automotive body, and the concept of phase field model is applied to construct the objective function for considering the welding area which causes an increase of the production cost. The optimization problem is formulated to minimize both the mean compliance of body structure under an exciting load and the contact area between two materials. To confirm the usefulness of the proposed method, a structural design example for an automotive underbody is provided.
화력과 기동의 통합성능을 고려한 미래 전투차량의 해석 기반 설계 프레임웍 연구
임성훈(Sunghoon Lim),임우철(Woochul Lim),민승재(Seungjae Min),이태희(Tae Hee Lee),류재봉(Jae Bong Ryoo),변재정(Jai-Jeong Pyun) (사)한국CDE학회 2014 한국CDE학회 논문집 Vol.19 No.4
This paper proposes the 3D modeling and simulation technique for predicting the integrated performance of combat vehicle. To consider the practical driving and firing condition of a combat vehicle, the full vehicle model, which can define the six degrees-of-freedom of vehicle motion and various firing angles, is developed. The critical design parameters such as the stiffness and damping coefficient of suspension system are applied to construct the analysis model of vehicle. A simple ballistic model, which incorporates the empirical interior ballistic model and the point mass trajectory model, is built to estimate the firing range and the firing recoil force. To predict the integrated performance and analyze the effect of system parameters, MATLAB/SIMULINK model of a combat vehicle for performing the real time simulation is also developed. Several simulation tests incorporating the road bump and the firing recoil force are presented to confirm the effectiveness of the proposed vehicle model.