There are some common power machinery covers, pipes, hulls, car bodies, etc. they are mostly made of metal sheets, which can radiate strong noise after being excited. This kind of noise caused by the vibration of sheet metal structure is called structural noise.
There are three methods to control the structure noise: the first is to reduce the excitation force; the second is to stagger the natural frequency and the excitation force frequency by modifying the structure parameters; the third is to increase the damping of the system to suppress the structure vibration and reduce the noise, which is called damping vibration reduction. In contrast, in most engineering practices, damping technology is the most economical, simple and effective method among the three schemes.
The main component of viscoelastic damping material is polymer, which is also called polymer or polymer. Because it has the characteristics of both viscous liquid and elastic solid, it is also called viscoelastic material. Generally speaking, the damping material with polymer as the base material is usually called viscoelastic damping material. So as to achieve the purpose of sound absorption.