Abstract
A wave-based 2.5-dimensional numerical analysis method for prediction of road traffic noise was developed. Some applications of 2.5-dimensional numerical analyses based on a frequency domain numerical analysis such as boundary element method have been reported so far. In this study, 2-D to 3-D conversion technique based on a transient response was newly formulated. The developed method was applied to an insertion loss of noise barriers and noise prediction around a semi-underground road structure, and the validity of the analysis method was confirmed by comparison with physical experimental results. Furthermore, the calculation was utilized to develop a practical calculation model of noise radiated from semi-underground roads.
