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    초록·키워드

    Most of large structures such as ship, airplane, and so on have internal structure borne noise sources. The operation of the machineries results in vibration and noise of the structure. Particularly, the vibration of the machineries is transmitted to the far place from the sources and emits noise into the water or outdoor as well as the inner space of the structure. In the case of warships this emission into the water induces noise to reduce the performance of its underwater acoustic equipment. Therefore the structure borne noise levels of the installed machineries are strictly limited. This paper shows examples of structure borne noise reduction from machineries including pumps.

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