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DRRD캠 형상 최적설계를 위한 다항식 합성법과 캠 로우브면적에미치는 형상계수들의 영향
김도중(Dojoong Kim),박성태(Sungtac Park) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A multi-polynomial method is proposed to synthesize DRRD cam protiles. A cam Jill duration is divided into 10 sections. cach of them is expressed by a polynomial equation. 12 design variables are extracted from the cam profile displacement. velocity, and acceleration curves. Because all the design variables have physical meanings which arc familiar to most cam designers, it is easy to imagine a profile shape from the design variables. The design envelope of the method is wide enough to be used in DRRD automotive cam designs. Polydyne cams, widely used in automotive engines. are included into the envelope. Unlike Polydyne cams. the method provides capability of wide velocity factor variations. which gives much flexibility in flat-faced t:Jppet design. Area factor of profiles designed by the method can be increased 5 - 10% compared to those of Polydyne cams without increasing acceleration factor. The method is especially useful for cam profile optimizations.<br/>
김도중(Dojoong Kim),윤재원(Jaewon Youn),김진웅(Jinwoung Kim),송진욱(Jinook Song) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_1
Rotation of intake and exhaust valves are very closely related to the long term durability of automotive engines. If the valves do not rotate even at a rated engine speed, it causes the uneven wear of the valve seat and valve head contact area. which eventually shortens the engine life. A principle of valve rotation mechanism was presumed based on some findings from experiments, and computer programs were developed to simulate the valve rotation phenomena. In this study we investigated the valve rotation mechanism by using the computer simulation models.