以某航海教学实习船机舱为原型，将此振动—声辐射耦合系统简化为箱形多腔结构，建立多腔结构及其单元腔室有限元模型，考虑液舱布置与充液、激励源处设置隔振器等情况，对结构进行频率响应分析，运用声学边界元法对舱室噪声进行预报，通过对舱室中心场点声学贡献较大的板件进行约束阻尼处理，有效降低舱室噪声。并进行船舶机舱模型振动—声辐射实验。分析表明：研究三舱段船舶机舱模型振声性能时，充液及增加充液舱数，对模型固有频率影响明显，通过设置隔振器能有效降低舱室振声等级，在非激励源舱室敷设约束阻尼材料，也可起到较好降噪作用。%The engine room of a training ship for navigation teaching was taken as a prototype, and the finite element model of multi-tanks structure and its unit chamber was built when the vibro-acoustic coupling system was simplified. Fre-quency response analysis was carried out in the consideration of filling liquid, arrangements of the liquid tanks, and loca-tions of excitation source with vibration isolator. The noise of ship cabin was predicted by means of acoustic boundary ele-ment method and the noise level was reduced effectively by using constrainted damping treatment on plates of a large amount of acoustic contribution to the center field. And the vibro-acoustic radiation experiment of the marine engine room model was conducted. Analysis indicates that the natural frequency is influenced obviously with different conditions of fill-ing liquid and increasing the number of tanks filled with liquid. Vibration isolator can reduce the vibro-acoustic level. Con-straint damping materials laid in the cabin with non-excitation source can also reduce noise effectively.
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