A study on the estimation method of vibration characteristics of marine engines below 7-cylinder based on a test

실험 기반 7기통 이하 선박용 엔진 진동 특성 예측 방법에 관한 고찰

H-mode or X-mode predominates in marine engines according to the number of cylinder. Generally, H-mode noticeably happen in the engine below 7-cylinder and X-mode remarkably happen above 8-cylinder in the engine operating range. Until now, FEA (Finite Element Analysis) of 3D engine model has been mainly used to estimate the engine vibration but it is very time consuming for simulation and difficult to model simplification. Furthermore, the accuracy of simulation shows a marked difference according to modeling method. Therefore it is very difficult to have contentable result from FEA for beginners and laymen. In this paper, the estimation method based on a test has been suggested to solve the difficulty.