Method of Vibrational Energy Flow Visualization Based on Frequency Response Function

摘要

The research aspect of application of structure surface intensity to the analysis of thin-walled structures was the subject of the work. Method is based on direct frequency response analysis what allow to receive exact within FEM structural intensity vector field.. The numerical examples concern thin-walled structures with harmonic excitation.. The numerical models included the source of vibrations in form of force excitation with known position and sink of energy with localized damper. The results of method are compared with results received using modal superposition method. Under special interest was the shape of intensity vector field. There were shown the advantage of applied method. The results of the numerical calculations allow estimate the spatial distribution of structural intensity vector values on the surface parts and enabled more precise analysis of vibration energy flow. The energy balance done for particular elements leads to valuable practical conclusions for restrain of the vibration energy flows and lowering of the sound radiation. The method of intensity calculation can be used in discontinuity and damage diagnostics of mechanical constructions.