To reduce structure-born noise, it is usually supposed effective to reduce vibration, which is one of the causes of the noise. Vibration intensity (VI) technique, which shows the flow of vibration energy and the vibration source in structures, has been studied in the last several years.
In this study, the measurement method and theory of VI were derived from its definition, and errors caused by assumptions, approximations, and measurement were investigated. As a result, VI was found to be an effective measurement technique to show the energy propagation routes on a panel, although it did not indicate the location of the vibration source.
Furthermore, a new method to reduce vibration was proposed as one of the applications of VI analysis. The distribution of dissipated energy and the effect of damping materials pasted on a panel were clarified by the flow of VI, because it allowed the estimation of the dissipated energy in a certain closed area.
Consequenty, it was verified that vibration is effectively reduced by pasting damping materials on the panel area where much energy was dissipated.