Crank Angles Design to Reduce the Excitation Forces in 4-stroke Diesel Engine

4행정 기관의 기진력 감소를 위한 크랭크 각 설계

The excitation forces from the periodical firing pressure in cylinder and the rotating crank mechanism cause lots of vibration problems in diesel engine. In this paper, the theoretical formulas for excitation forces are introduced and computational program for the optimization of crank angle is also developed to reduce the free moments in diesel engine. The computational results of 4-stroke in-line engine are applied to verify the reliability of the program.