防振内装による船室の騒音低減効果

抄録

Experiments were carried out to obtain useful knowledge how to attach a panel resiliently to vibrating ship structures in order to isolate vibration effectively and to confirm the noise reduction effect by good resilient mount lining system in a cabin model.
The results obtained are as follows.
Vibration isolation mats, such as Rockwool boards, have much greater vibration isolation performance than isolation rubber for elastic mount of panels. The isolation effects predicted by the presented method, replacing the static mass of panel by effective dynamic one acts on the mounting rubber, are compared with experimental data obtained for rubber mount. Agreement with experimental results is better than those of the static mass method.
Light weight panels used for inner walls and ceilings, such as plywood thinner than 9mm thick, can not be isolated vibration effectively compared with heavy floor panels, and this causes the poor noise reduction effect (≤10dB (A) ) for floating accommodation system.
Average radiation ratio of resiliently mounted lining shows several dB higher than that of rigidly attached lining.