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이준성(Joonseong Lee) 한국시뮬레이션학회 2002 한국시뮬레이션학회 논문지 Vol.11 No.3
This paper describes an automated evaluation of electrostatic field for micro motors whose sizes range 10 to 103 m. Electric field modeling in micro motors has been generally restricted to in-plane two-dimensional finite element analysis (FEA). In this paper, the actual three-dimensional geometry of the micro motor is considered. An automatic FE mesh generation technique, which is based on the fuzzy knowledge processing and computational geometry techniques, is incorporated in the system, together with one of commercial FE analysis codes and one of commercial solid modelers. The system allows a geometry model of concern to be automatically converted to different FE models, depending on physical phenomena to be analyzed, electrostatic analysis and stress analysis and so on. The FE models are then exported to the FE analysis code, and then analyses are performed. Then, analytical analysis and FE analysis about the torque generated by electrostatic micro motor are performed. The starting torque is proportional to V2, the calculated starting torque from the two-dimensional analytical solutions are three times larger than those from the three-dimensional FE solutions.
Automatic Mesh Generation System for Three-Dimensional Design
Yoonjong Choi(최윤종),Yangchang Lee(이양창),Namyong Kim(김남용),Joonseong Lee(이준성) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes an automatic finite element (FE) mesh generation for three-dimensional structures consisting of free-form surfaces. This mesh generation process consists of three subprocesses: (a) definition of geometric model, i.e, analysis model, (b) generation of nodes, and (c) generation of elements. One of commercial solid modelers is employed for three-dimensional solid structures. Node is generated if its distance from existing node points is similar to the node spacing function at the point. The node spacing function is well controlled by the fuzzy knowledge processing. The Delaunay method is introduced as a basic tool for element generation. Automatic generation of FE meshes for three-dimensional solid structures holds great benefits for analyses. Practical performances of the present system are demonstrated through several mesh generations for three-dimensional complex geometry.
박용성(Yongsung Park),최영태(Youngtae Choi),정혁(Hyuk Jung),김남용(Namyong Kim),이준성(Joonseong Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The catalyzed wall flow type DPF system showed PM conversion efficiency of over 90%. But it usually not properly work due to the low exhaust gas temperature. This study shows the performance of the Partial DPF system. PM reduction efficiency of the Partial DPF system is over 55% for ND-13mode and ETC. CO and HC conversion efficiency is over 95% and 85%. Smoke reduction efficiency is over 48% for engine lug down-3 mode.