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문희곤(Heegon Moon),왕세명(SemyungWang) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Generally, topology optimization deals with force input systems which is very common in structural analysis. And<br/> design sensitivity analysis(DSA) for those systems has been well established by many mathematicians and engineers.<br/> In general, the force input model works well for the general structural systems. Certain physical system, however,<br/> requires displacement input model, such as voltage input in electrostatic systems. This paper present the DSA for<br/> displacement input systems using the adjoint variable method(AVM). An optimal energy absorbing system is<br/> achieved for the prescribed displacement system. The proposed design method would be applied to more practical<br/> systems like bumper.
Heegon Moon(문희곤),Semyung Wang(왕세명),Hokyung Shim(심호경) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This paper presents the adjoint variable design sensitivity analysis for thermal systems considering both conduction and convection heat transfer. Both nodal temperature and total heat flow are considered to be objective functions and design sensitivity formulas are derived for each case. For the case of convection heat transfer, the adjoint analysis is carefully proceeded to obtain a precise result. A topology optimization example is examined for a simple planar square plate in order to design a heat exchanger as verification.
신뢰성을 고려한 전기-열-구조 연성계에 대한 위상최적설계
문희곤(Heegon Moon),김좌일(Chwail Kim),왕세명(Semyung Wang) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Reliability-based design optimization (RBDO) has receives high attentions in an optimization society together with topology optimization. The goal of the probabilistic optimization is to consider the variations of performances caused by uncertainties. A micro-actuator is a standard component in micro-electro-mechanical-systems (MEMS). Among many types of micro-actuators, electro-thermo-mechanical devices are being paid attention from a topology optimization society. Previous works showed the new design of the actuator using a topology optimization technique or presented that convection phenomena played important role when applying a topology optimization technique to electro-thermo-mechanical devices. In this research, design sensitivity analysis(DSA) for the electric-thermal-structural system is reviewed and DSA for the input current is presented. As an application, an electric-thermal actuator from a RF switch is designed using both deterministic and reliability-based topology optimization (RBTO).
문희곤(Heegon Moon),왕세명(Semyung Wang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Generally, topology optimization deals with force input systems which is very common in structural<br/> analysis. And design sensitivity analysis(DSA) for those systems has been well established by many<br/> mathematicians and engineers. In general, the force input model works well for the general structural systems.<br/> Certain physical system, however, requires displacement input model, such as voltage input in electrostatic<br/> systems. This paper present the DSA for displacement input systems using the adjoint variable method(AVM).<br/> For design of the compliant mechanisms which are structural systems, the displacement input model has<br/> shown better performance than the force input model. The authors believe that the derived DSA equations in<br/> this research can be applied to the various physical systems, especially to the Microelectromechanical<br/> Systems(MEMS).
전자기와 열전달을 고려한 고효율 모터의 다분야 위상최적설계
왕세명(Semyung Wang),심호경(Hokyoung Shim),문희곤(Heegon Moon),조양희(Yanghee Cho),김명균(MyungKyun Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
This paper presents a new approach regarding thermal characteristics associated with a design of the high efficiency motor. Electrical conduction materials, such as coil and aluminum embedded in the core generate high heat exerting negative influence on both lifetime and performance of machine. Thus, it is necessary to design high efficiency motor considering heat transfer in order to improve motor performance and to be protected against overheating. In this paper, firstly, numerical analysis of electromagnetic field is carried out by the nonlinear transient finite element method (FEM). Secondly, the linear static FEA of magneto-thermal field is implemented by applying source current computed by the nonlinear transient analysis. FE results are validated in terms of electromagnetics and heat transfer by experiments. And then, the pseudo-transient topology optimization using a multi-objective function is performed. The proposed method is applied to a squirrel cage single-phase induction motor of the scroll compressor.