Torpedo itself is a thermal force torpedo which is widely used by many mechanical equipment and moving components, and it is particularly complex In the thermal power torpedo, all kinds of pumps, intermediate frequency generators and transmission mechanisms of propulsion system are very complex moving mechanical systems. During the working process, the vibration of these devices is large, which leads to the high underwater radiation noise of the torpedo, which affects the operational efficiency of the torpedo. 

Therefore, it is a key technology of modern torpedo design to take various effective measures to reduce the radiation noise level of the torpedo Damping materials have attracted more and more attention in modern torpedo design because of their remarkable characteristics of vibration reduction and noise reduction. In the United States, damping materials were first used in the propulsion system of torpedo to reduce the noise of propulsion system. In the United States, the noise reduction of mk48-6a t torpedo is mainly improved. The main measures are to install a muffler at the rear and a damping layer on the rear shell, which greatly reduces the radiation noise level of this type of torpedo. 

The 2000 torpedo developed in Sweden also adopts damping measures. The engine piston of the torpedo is connected with the compressor piston. The condenser is arranged around the engine. The whole device is fixed on the shell by damping material. This new and unique high-energy, trackless propulsion system not only greatly improves the speed and range of the torpedo In recent years, the research results show that the vibration and noise level of torpedo can be significantly reduced by sticking pcmape constrained damping layer on the inner surface of torpedo rear cabin shell where the engine vibration is large. The damping material used as the component and damping base of torpedo thermal power device will bring more significant vibration and noise reduction effect.