VIBRATION OF VERY LARGE SHIP EXCITED BY MAIN ENGINE

摘要

Ship global vibration and main engine excited resonance is studied. Added water mass is taken into consideration by virtual mass method. Main engine is one of the important excitation of ship vibration. Based on three dimensional finite element model of whole ship, the influence of main engine excitation (H overturning moment, X overturning moment and 4th vertical moment) on ship vibration is investigated. According to frequency analysis, vibration response of wheelhouse due to engine excitation is obtained. Evaluate vibration situation by the related criterion conditions. Added water mass can effect vertical natural vibration. Under excitation frequency of the 4th vertical moment, response due to the 4th vertical moment is larger. While above this frequency, response due to the H overturning moment is larger. H overturning moment leads to the largest acceleration. And the 4th vertical moment leads to the largest velocity.