Damping material is a kind of material which transforms the vibration energy of solid machinery into heat energy and dissipates it. It is mainly used for vibration and noise control. Submarines are an important part of the Navy, but the excessive noise of submarines increases the probability of being found, which makes their survival threatened. The research shows that most of the radiated noise comes from the mechanical noise.

This kind of noise comes from the vibration produced by the driving device when it works, and radiates the noise through the hull to the flow field. For the submarine, the damping materials are divided into two categories: one is the acoustic tile covered outside the submarine (China is the shark skin material), the other is the acoustic damping material inside the submarine, such as the engine and the hull to avoid rigid connection, Damping shock absorbers or floating rafts are mostly used as damping materials. With the development of anti submarine technology, many countries have made great efforts to reduce submarine noise.

Because submarines have been sailing in the deep sea for a long time, they not only have to face the complex marine environment but also reduce the possibility of being discovered, which requires reducing noise. Therefore, the noise is one of the important indicators to measure a submarine. The mechanical noise control mainly adopts the method of damping and vibration isolation. The first ten modes of damping and noise reduction of the submarine's single-layer cylindrical shell with free damping and the "sandwich" cylindrical shell with constrained damping layer are all excellent. The polymer environmental protection constrained damping plate has the advantages of thin thickness (less than 1mm), light weight and sound insulation It has the advantages of good noise reduction effect, so it is very important to reduce the noise of submarine by suppressing the vibration of the hull.