In recent years, the research on problem of marine diesel engine's vibration and noise has been deeply stud-ied. Because of that, the vibration mainly caused by diesel engine exciting force is becoming the point of the study. The main noise source of ship hull low frequency vibration and underwater radiation noise is marine diesel. In this paper, the ship mod-el with the diesel engine of the structure is established according to the 30 000 DWT hull′s size. The ship natural frequencies and the diesel engine natural frequencies are calculated by finite element method. The tested cylinder pressure data load is applied to the diesel. On the basis of that, the vibration transmission function of ship hull caused by diesel engine force is analyzed. Characteristics of ship vibration caused by diesel engine excitation transferring to hull via fundus are studied too.%近年来,随着对船舶内燃机振动和噪声问题研究的不断深入,由主机引起的船体振动问题正成为各船舶设计部门的研究重点,它是船体的低频振动和水下辐射噪声的主要激励源.为此,本文根据某30000 DWT散货轮建立带有柴油机的船体有限元分析模型,分别对柴油机模型和船体模型进行模态分析,得到其固有特性.基于瞬态动力学方法,利用实测缸内压力数据对柴油机进行振动响应分析,研究主机激励经由机脚、基座传递到船体的传递特性,并且进一步计算分析主机激励船体的振动响应规律,为机、桨、船的匹配设计提供参考.
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