Application of the combined higher order time–frequency method to the identification of wave propogation

Abstract

The wave propagation in a solid is an interesting topic for mechanical engineering since it often gives an idea for the structure damage. However it is often difficult to measure the wave propagation in beam due to the difference of speed of wave depending on frequency. In order to solve this problem, many time–frequency methods have been developed. Especially Wigner–Ville distribution, wavelet analysis and short time–frequency analysis are recently popular methods in this field. These methods have an advantage and a disadvantage depending on the type of structure. In this paper, the combined higher order time–frequency method is developed and used for the good identification of wave propagation. It can be applied to the damage analysis of the structure in detail. [Work supported by the Nuclear Research Project in Korea.]