CAJ | 학술논문

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。
이모항해교학실습선궤창위원형，장차진동—성복사우합계통간화위상형다강결구，건립다강결구급기단원강실유한원모형，고필액창포치여충액、격려원처설치격진기등정황，대결구진행빈솔향응분석，운용성학변계원법대창실조성진행예보，통과대창실중심장점성학공헌교대적판건진행약속조니처리，유효강저창실조성。병진행선박궤창모형진동—성복사실험。분석표명：연구삼창단선박궤창모형진성성능시，충액급증가충액창수，대모형고유빈솔영향명현，통과설치격진기능유효강저창실진성등급，재비격려원창실부설약속조니재료，야가기도교호강조작용。
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.