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김좌일(Chwail Kim),왕세명(Semyung Wang),황일한(Ilhan Hwang),이종현(Jonghyun Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
One probabilistic design method is the Reliability-Based Design Optimization (RBDO) which has probabilistic constraints considering the probability of the satisfaction/failure of constraints. In this research, the RBDO concept is applied to Topology Optimization and Reliability-Based Topology Optimization (RBTO) is developed. RBTO can be a useful and meaningful method, but it requires expensive computation time. Therefore, this research proposes parallel computed RBTO using Response Surface Method (RSM) since the parallel computing can save processing time for the optimal design. The proposed RBTO methodology is applied to MEMS systems. Specifically, in MEMS system, RBTO can be highly effective because of the system characteristics such as etching process and scaling effect.
Development of the Design Process for Laser Scanned Model
Chwail Kim(김좌일),Semyung Wang(왕세명),Euichul Kang(강의철),Kwanheng Lee(이관행) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Recent engineering process requires fast development and manufacturing of the products. This paper mainly discusses the process of rapid product development (RPD) from the reverse engineering to the optimal design. A laser scanning system scans a product and the efficient data processing method reduces the scanned point data. The reduced (scanned) points model is transformed to a finite element model without the construction of a CAD model. Since CAD modeling is a time-consuming work, skipping this step can save much time. This FE model is updated from the result based on the structural characteristics from modal test of the real model. For FE model updating, Response Surface Method is adopted. Finally, the updated FE model is optimized using the reliability-based topology optimization, which is developed recently. All these processes are applied to the design of an upper part model of a cellular phone.
왕세명(Semyung Wang),김좌일(Chwail Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The response surface method (RSM) became one of famous meta modeling techniques, however its<br/> approximation errors give designers several restrictions. Classical RSM uses the least squares method<br/> (LSM) to find the best fitting approximation models from the all given data. This paper discusses how to<br/> construct RSM efficiently and accurately using moving least squares method (MLSM) with sensitivity<br/> information. In this method, several parameters should be determined during the construction of RSM.<br/> Parametric study and optimization for these parameters are performed. Several difficulties during<br/> approximation processes are described and numerical examples are demonstrated to verify the efficiency of<br/> this method.
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).
왕세명(Semyung Wang),김낙진(Nakjin Kim),김좌일(Chwail Kim),문희곤(Hegoon Moon) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
General deterministic optimization does not consider the uncertainties which can happen after the design process. The Probabilistic approach, which conduced in this research, does not treat the design parameter and external load as deterministic values but statistical value having probabilistic distribution. So with this concept, Finding design parameters which minimizes the object function and satisfies the target reliability in the same time. In this thesis, author conducted Reliability Based Topology Optimization design process applicable for initial design, assuming the uncertainties is in the external loading, so to speak the magnitude of applied loading, the direction angle of applied loading, and the location of applied loading. Some examples show the effectiveness of the proposed method.