Abstract
ABSTRACT In this study, the torsional vibration analysis for a marine propulsion system is carried out by us-ing the transfer matrix method(TMM). The torsional moment produced by gas pressure and recip-rocating inertia force may yield severe torsional vibration problem in the shaft system which results in a damage of engine system. There are several ways to control the torsional vibration problem at hand, firstly natural frequencies can be changed by adjusting shaft dimensions and/or inertia quanti-ties, secondly firing order and crank arrangement are modified to reduce excitation force, and finally lower the vibration energy by adopting torsional vibration damper. In this paper, the viscous torsional vibration damper is used for reducing the torsional vibration stresses of shaft system and it is con-formed that optimum model of the viscous damper can be determined by selecting the geometric de-sign parameters of damper and silicon oil viscosity. * 기 호 설 명 : 조화하중의 진폭 토크(N-m) : 엔진 회전수(rpm)
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