ABSTRACT
The fundamental frequency of the vibration reflects the vibration characteristics of the structure. High vibration frequency shows that the structure stiffness is large, then the vibration is easy to decay. Therefore, the fundamental frequency of vibration from one side reflects the damping effect of the structure is good or bad. The damping factor (Yang, 2011) as an index to evaluate the damping effect because viscoelastic damping vibration reduction method is based on the form of no significant change in structure to increase the damping of the structure, so the damping level can accurately reflect how the damping effect of the scheme. The resonance response peak value of the structure is another index of evaluating the effect of vibration reduction because the resonant response of the structure is greatly influenced
1 INTRODUCTION
According to the practical need, the method of applying the viscoelastic damping layer (Shen, 2006) to the aerospace load box structure is used to reduce the vibration. In this paper, the constrained damping layer is adopted, which is composed of damping layer and constrained layer. Viscoelastic damping layer is in the form of simple, light weight, easy to paste, excellent damping performance, does not need to change the existing structure, the use of less material will be able to achieve a larger damping effect (Wang, 1990).
