| 摘要 |
A sound-damping material for underwater use includes a layer of solid material having a thickness of at least 1 cm and an open structure. The material has open alveole structures of 2-20 alveoles per centimeter which, in use, are filled with water. The front surface of the material is preferably structured with crests and troughs. The material is a plastic material having a glass transition temperature for frequencies of 50-500 Khz which is near to a temperature of use. The layer preferably includes an open-cell cellular plastic which is preferably a reticulated polyurethane foam. <IMAGE> |
