Experimental study of prediction model of insertion loss of buildings for elevated noise source

Abstract

The assessment of environmental noise in urban areas is challenged by the issue of effectively modelling complex noise propagation behaviors among buildings. As one of the solutions, the ASJ RTN-Model, a calculation model for road traffic noise, includes an effective calculation method for predicting noise propagation behind buildings, which enables prediction of noise distribution without heavy computational burden. However, the current model is only applicable to fixed frequency characteristic of the noise source with a fixed height at ground level, so further efforts are needed to extend its application range. In previous work, we established a modified model that is frequency-dependent and supports various frequency characteristics of the noise source. Based on the successful demonstrations, we further propose the attempt that extends the model to be applicable to elevated noise source. The effort mainly involves re-investigations of the determination of the geometric variables and constants in the prediction equations, which is then examined by comparing the prediction results to the measured results from scale model experiments.