The insertion loss of finite length barriers on the ground

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Abstract
This paper presents a method for estimating the insertion loss (IL) of a finite length barrier on the ground. This method is an extension of the solution suggested by Jonasson [H. G. Jonasson, J. Sound. Vib. 2 2 (1), 113–126 (1972)] for estimating the sound reduction by an infinite length barrier on the ground. It uses diffraction theory, combined with a model for sound propagation over the ground, to calculate the diffracted field created by the diffracted path associated with each edge of the barrier. The diffracted paths are identified by simple geometrical considerations. The results obtained using this new method are compared with other theoretical methods and with the results of experimental measurements. It is shown that the new solution is as accurate as other more complex solutions.

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