Acoustic power radiated by the hull partition of a ship measured with spatial intensity vector

Abstract

Generally, acoustic intensity fields in small enclosures are more or less rotational and acoustic energy flows along curved and closed streamlines. This kind of phenomena is also found in measurements of the spatial intensity vector in ship accommodations. Rotational character of the complex intensity field is stronger in the near field close to the vibrating partitions, but strong rotations can also be observed in the far field. These are caused by reflections from the walls or because of interference between the direct rotational field from the cabin partitions being coherent sources. Describing the structureborne noise field in small enclosures like ship accommodations with spatial intensity vector can be of great help in solving engineering problems in noise abatement work on ships. One of the main advantages of using sound intensity is that it is possible to identify the structureborne energy transmitted through different parts of the cabin partitions.