Sound propagation above periodic & aperiodic rough surfaces

Invited paper

Shahram Taherzadeh

The Open University

Tuesday 2 june, 2015, 17:20 - 17:40

0.8 Rome (118)

Transport noise is an ever present concern in urban areas affecting quality of life for millions of people. Limitations on space and aesthetic considerations limit the choice of noise control measures. Roadside areas and surfaces offer an opportunity to be utilised for this purpose. It has been shown that artificially making a rigid, flat surface rough results in broadening the destructive interference between direct and ground-reflected sound waves and reduces its centre frequency. This paper investigates effect of aperiodic and period patterns of roughness and also the role of vacancies (missing elements) in the pattern on optimising the overall insertion loss from the surface. Model measurements to test these results are also reported.

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