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유동해석 결과를 구조해석에 적용하는 다물체 자료 변환 프로그램
이재철(Jae-Chul Lee),천두만(Doo-Man Chun),안성훈(Sung-Hoon Ahn,),장재덕(Jae-Duk Jang) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The finite element programs have been developed for structure, collision, flow, dynamics, heat transfer, acoustics, electromagnetism, MEMS (Micro Electro Mechanical Systems), and etc. These programs can be classified as “package” program and “single purpose” program. Single purpose programs usually have convenience and powerful functions, but these programs are difficult to expand into different fields of analysis. Therefore, the method to transfer the analysis results of single purpose program to other programs is needed. In the research, a multibody conversion method was created to input the flow analysis result of CFD-ACE+ to a package program, ANSYS. For example, the structure analysis of torque converter was conducted by the multibody conversion method.
토크컨버터의 성능 예측 정확성 향상을 위한 열유동 해석기법 연구
정재혁(Jae Hyuk Jung),이명성(Myungsung Lee),허남건(Nahmkeon Hur),장재덕(Jae Duk Jang),홍순석(Soon Seok Hong) 한국유체기계학회 2009 유체기계 연구개발 발표회 논문집 Vol.2009 No.-
Recently, the steady and transient incompressible viscous turbulent flow is simulated for performance prediction of a torque converter with various numerical methods. In the previous study, even though the transient analysis requires substantial computational resource than that of steady analysis, both the steady and transient analysis predicted fairly accurate results with the experimental data. In the present study, the influence of viscosity variation on prediction of performance was investigated by thermo-fluid analysis. Flow regions of each parts of entire torque converter are modeled for the analysis by using the polyhedral mesh. The thermo-fluid analysis shows more accurate result than fluid analysis on the capacity factor.
김동진(Dong-Jin Kim),장재덕(Jae-Duk Jang),주인식(In-Sik Joo) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
The secondary flow loss coefficient of a torque converter internal flow field has been expressed by an equation relating to torus flat ratio and rotating speed ratio. This equation was proved with comparing the result of one-dimensional analysis with that of three-dimensional simulation. With the increasing flat ratio and rotating speed ratio, this coefficient has increased. The same value of coefficient could be used for input torque capacity and output/input torque ratio for all speed ratio.
박판형 토러스를 갖은 자동차용 토크컨버터의 성능 최적화
이병철,신세현,김철,문수연,장재덕,주인식(Byung-chul Lee),Se-hyun Shin,Cheol Kim,Su-yeon Moon,Jae-duk Jang,In-sik Joo 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Automotive torque converters have recently been designed with an increasingly narrow profile for the purpose of achieving a smaller size, which also translates into savings. New torque converter with flatted torus was designed to compare with reference torque converter having circular torus. Flatted torus has non-axisymmetrical ellipticity and a trapezoid stator created by typical blade design method. To evaluate the overall performance, CFD code was used. The present numerical analysis was performed for the full three-dimensional turbulent flows. The torque ratio and Input capacity factor of Flatted torque converter were compared with reference model having circular torus and have been good agreement with it.<br/>
[동력전달계] 자동 변속기 클러치 제어압의 안정성 개선
김기우(Kim Gi-woo),장재덕(Jang Jae-duk) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
As excellent shift quality is increasingly demanded in Automatic Transmission (in short : A/T), performance study of clutch control pressure has lately become a new subject of special interest, In particular, clutch control pressure needs high operational stability and quick response, To solve this problem, a notch effect of pressure control valve has firstly been examined using new' method like root locus in this study, Optimal geometric shape of the notch for PCV is also discussed, Theoretical and experimental results demonstrate that the proposed triangle notch is one of the useful methods for the improvement of hydraulic stability and suppression of pressure riffle, Consequently, this study provides feasible results for hydraulic control system design