Prediction of Vibration Energy Levels on Structures Using Wave Intensity Analysis Based on Experimental Data

Abstract

This paper describes a Wave Intensity Analysis (WIA) method based on experimental data, which is named Experimental WIA (EWIA). EWIA uses coupling and internal loss factors obtained experimentally through the power injection method, commonly applied in Experimental Statistical Energy Analysis (ESEA). The directional dependency of the energy is introduced by deriving a transmission coefficient for each boundary at each frequency band. Then, EWIA is applied to predict the vibration energy of simple plate systems and the results are compared to directly measured energies, WIA and ESEA energy predictions. The results show that EWIA can improve the WIA and ESEA predictions without any additional effort. Moreover, EWIA provides more information than ESEA about the characteristics of the energy field, which allows a more detailed analysis of the structure.