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오재춘(J.C.Oh),박민철(M.C.Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
This paper introduces the details of a low noise and vibration design realized by fully utilizing the experimental methods for the prediction of noise and vibration, applied to KIA's new ˝ J2 ˝ engine. In the development of this engine, the reduction of the vehicle interior noise was one of the highest priority aims. For this pupose, the influence of the engine noise on the vehicle noise was firstly investigated to identify the major noise sources. Then, masking best use of noise prediction techniques(FEM-Modeling, OVA. EMA. etc). the noise radiation mechanisms were clarified and the components identified as major noise sources were re-designed. In these improvements, the theorical techniques also predicted carefully the effect of design change on the related components, including their installation in an engine as required. These procedures achieved a remarkable noise reduction of the engine by cost effective methods.<br/>
유한요소 해석법을 이용한 자동차용 변속기의 변형 및 응력 해석
박주상(J.S.Park),오재춘(J.C.Oh),최천(C.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
This paper describes a finite element analysis carried out on the transmission casing so that an integrated analysis procedure can be introduced using IDEAS. NASTRAN and a transmission analysis program (Romaxdesigner) to improve the initial transmission design. A FE model was created using IDEAS and<br/> analyzed using NASTRAN. Bearing loads calculated from' the transmission analysis program were applied to FE model. Deflection and stress analyses have been performed to evaluate the static characteristics of the initial transmission design. The analysis have been compared with test results to get more reliable data. We confirmed that the calculated value agrees well with the measured value. To reduce the stresses and deflections of the transmission casing, we carried out FE analysis again using the verified analysis method. As a result, we' suggest a transmission design having better quality to designer.
김형준(H.J.Kim),이원상(W.S.Lee),오재춘(J.C.Oh),최천(C.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
Air flow in the engine room has become an important factor in the performance improvement of engine cooling. Recently, engine room is becoming denser than ever, because of the advent of high power engine and larger passenger compartment area. Computer simulation is not only an economical tool in view of time and cost saving but also an efficient method for the optimal design. In this paper, cooling performances of two type radiators in the engine room have been simulated by using the commercialized CFD code, STAR-CD.<br/>