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캠 형상 최적설계를 위한 벨브 트레인 동특성 해석 모델
김도중(D.J.Kim) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A numerical modeling technique is proposed for computer simulations of high speed valve train dynamics. The dynamic terms in the valve spring reaction forces are calculated using linear vibration theory for given kinematic valve motions. Because the spring dynamics are analyzed before the time stepping integration, spring surge phenomena can be included<br/> without using additional computer time. Consequently, valve train dynamics can be simulated very quickly without noticeable errors in accuracy. The experimental results prove the computer model developed here is accurate and also computationally efficient. The model is especially useful for cam profile optimizations.<br/>
[論文] 캠 형상 최적설계를 위한 밸브 트레인 동특성 해석 모델
김도중(D.J.Kim) 한국자동차공학회 1993 오토저널 Vol.15 No.2
A numerical modeling technique is proposed for computer simulations of high speed valve train dynamics. The dynamic terms in the valve spring reaction forces are calculated using linear vibration theory for given kinematic valve motions. Because the spring dynamics are analyzed before the time stepping integration. spring surge phenomena can be included without using additional computer time. In addition to that, steady state response of the valve train dynamics can be obtained by just one cycle simulation. Consequently, valve train dynamics can be simulated very quickly without noticeable errors in accuracy. The experimental results prove the computer model developed here is accurate and also computationally efficient. The model is especially useful for cam profile optimizations.
Hermite 곡선을 이용한 자동차 엔진 캠 형상의 최적 설계에 관한 연구
김도중(D.J.Kim),김원현(W.H.Kim) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
A numerical method is proposed to optimize automotive cam profiles. An acceleration curve of a cam follower motion is described by Hermite curves. Because of the intrinsic characteristics of the Hermite curve, it is possible to design an acceleration curve with arbitrary shape. Design variables in the optimization problem are locations of control points which define the acceleration curve. Objective function includes dynamic performances as well as kinematic properties of a valve train. Similar optimization procedure was also tried using Polydyne cam profile synthesis method. Optimized profile using Hermite curve are proved to be superior to that using Polydyne method.<br/>
김도중(D.J.Kim),신병현(B.H.Shin),김현권(H.K.Kim),최규훈(K.H.Choi) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
A modeling technique is proposed for dynamic simulations of OHC valve trains with HLA(hydraulic lash adjuster). HLA is expressed by an air-oil mixture model considering HLA leak-down and aeration effects. A compact nonlinear equation is derived which describe the short tenn dynamic behavior of the HLA. Valve spring is analyzed by a distributed parameter model including nonlinear characteristics in the spring surge phenomena. Global behavior of the valve train except the valve spring is expressed by a lumped mass model. The experimental results prove that the simulation model developed here is accurate and useful for dynamic simulations of OHC valve trains with HLA.<br/> <br/>