Evaluation of Transmission Efficiency and Coupling Loss Factor of Structural Junctions.

摘要

The evaluation of transmission efficiency of structural junctions forms an important part in the study of structure-borne noise as it provides the basis for identifying and quantifying the vibration paths in the structure. In this report, analytical methods for evaluating the transmission efficiency of structural junctions including plate-plate and plate-beam junction are described. The calculation of coupling loss factor from the transmission efficiency of a junction for Statistical Energy Analysis (SEA) is also described. Sample calculations of transmission efficiencies on a number of structural junctions are presented. It is found that for typical naval ship constructions that consist of plates coupled to light thin beams, the elastic vibrations of the beams have a significant effect on the transmission efficiency.