Abstract
The sound radiation from a vibrating structure in water is investigated. The radiation depends on fluid boundaries, the geometry of structure, and associated mode shapes generated by driving forces on the structure. In the lower frequency range, the structure can be divided into regions having high and low radiation. These regions represent a distribution of sources and sinks of noise. The sound pressure level in the fluid domain and the velocity field is determined by using a boundary element method with input data of surface velocities obtained from the modal analysis of from a finite element calculation. A consideration of fluid structure interaction is possible. Alternatively, noise sources can be identified by intensity vector measurements in the acoustic near field. For a comparison of these approaches, the sound radiation from a vibrating plate calculated by the boundary element method (BEM) was compared with the results obtained by a superposition of pulsating spheres. The second approach is based on analytical results and the acoustic near field can be described in terms of energy flow.
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