The separate-sound and decoupled material is used to decrease the submarine sound radiation.In order to evaluate the material capacity

an experiment is performed and the experimental model is a large double cylindrical shell so that it more near to the real submarine.According to the material coating

the experiment is divided to several work occasions:full-coated

part-coated and no-coated

and the material capacity is evaluated by comprising the sound radiation in different work cases.When researching the structure sound radiation

its sound source level

sound band source level and source direction are discussed

and the influence of the part-coated is also discussed.The results show that the material can decrease the underwater structure sound radiation obviously

and reasonable part-coated can also decrease sound

but its capacity is weak when objected to low-frequency machine exciting.