The identification of noise transmission paths is important for the reduction of the interior noise in an enclosed field subjected to dynamic forces. Several techniques have been proposed for this purpose including the vectorial analysis technique using the structural-acoustic transfer function and numerical analysis methods such as the FDM, FEM and BEM. The present study is based on the experimental vectorial analysis technique which has some difficulties in working with complex structural geometries. To resolve this problem, a new acousto-structural reciprocity technique is proposed to find the transfer functions of boundary points to receiver point. In determining the acoustostructural transfer functions precisely in reciprocal method, the volume velocity of the acoustic source should be exactly and suitably measured. To find the volume velocity of an acoustic source several methods, such as using the laser velocimetry, the internal pressure measurement, the two microphone method in a duct and the acoustic reciprocity method are compared. By spatially averaging the structural-acoustic transfer functions, one can reciprocally evaluate the volume velocity of an acoustic source in a reasonably good accuracy. With the obtained acousto-structural transfer functions, the interior sound pressure in an enclosure can be predicted when the boundary points is randomly excited by uncorrelated dynamic forces and the predicted results are in good agreement with measured ones.
