The flow of vibrational power through structures is an important characteristic in understanding the behavior and the dynamic response of an elastic structure. In the case of thick or curved structural components, the vibrational power can be transmitted by different wave types which have different propagation characteristics through the structure and which can propagate at different speeds. A wave propagating through a structure can be scattered into other wave types when the wave encounters discontinuities in the structure, such as changes in cross section, stiffeners or bulkheads, etc. If the structure is fluid loaded, some of these waves propagate at supersonic speeds and can therefore very efficiently loose some of their energy to acoustic radiation. The efficiency of noise radiation from a structure is very much dependent on the presence of wavenumber components which are supersonic relative to the acoustic fluid that surrounds the structure. The supersonic wavenumber components can be associated with either waves that propagate at supersonic speeds or with supersonic wavenumber components created due to the presence of discontinuities. Consequently, for noise control purposes, it would be required to differentiate between the relative contribution and strength of the structural intensity that can be associated with different wave types or wavenumbers

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