Evaluation of optimum damping layout based on vibration energy analysis

Abstract

We investigate vibration energy reduction method in harmonic vibration. A beam structure modeled by Finite Element approach is used as an example. Not only resonance condition but also non-resonance condition in which no particular mode is dominant, is evaluated. Focusing on energy dissipation of damping addition, a process of finding effective damping addition area is investigated. The method using distribution of dissipation power, and the method using dissipation sensitivity analysis of the vibration energy are proposed. In the resonance excitation case, the optimum damping layout for vibration suppression can be determined by both methods. On the other hand, in the non-resonance excitation case, no obvious correlation is found between the optimum damping layout and the distribution of dissipation power. However, the sensitivity analysis leads the optimum damping layout even if the excitation frequency is non-resonance.