The cover, pipeline, hull and car body of some common power machinery are mostly made of thin metal plates, which can radiate strong noise after being stimulated. This kind of noise caused by the vibration of metal sheet structure is called structural noise. There are generally three ways to control structural noise: the first is to reduce the excitation force; 

 the second is to stagger the natural frequency and excitation force frequency of the structure by modifying the parameters of the structure; the third is to increase the damping of the system to suppress structural vibration and reduce noise. This measure is called damping vibration reduction. Comparatively speaking, in most engineering practices, damping technology is the most economical, simplest and effective method among the three schemes. 

相比较而言，在大多数工程实践中，阻尼减振技术是上述三种方案中最经济、最简单以及最有效的办法。粘弹性阻尼材料的主要成分是高分子化合物，通常也被称之为高聚物或聚合物，由于它同时具有黏性液体和弹性固体的特征，故又称之为粘弹性材料。

The main component of viscoelastic damping material is polymer compound, which is also called polymer or polymer. Because it has the characteristics of viscous liquid and elastic solid at the same time, it is also called viscoelastic material. The viscoelastic damping material is commonly referred to as the damping material with polymer as the matrix material. So as to achieve the purpose of sound absorption.