Initial results for traffic noise mitigation with Helmholtz resonators in the ground surface beside a road
Paper i proceeding, 2013

For reduction of road traffic noise, measures focussing on the propagation path are needed as complements to measures at source. Here, the effect of Helmholtz resonators, buried in the ground surface alongside the road, is investigated. Possible benefits of buried resonators are that they can function without obstructing the accessibility to the protected area. A modelling approach using equivalent sources is described for a coupled field of resonators in an otherwise acoustically hard ground plane. The model is validated in comparison with laboratory measurements. For selected road traffic cases, the model is used to predict the effect of resonators in a grid pattern within a strip along the road, showing noise reductions of 2-4 dBA.

Helmholtz resonators

Traffic noise abatement

Sound propagation calculation


Jens Forssén


Bart van der Aa


42nd International Congress and Exposition on Noise Control Engineering 2013: Noise Control for Quality of Life, INTER-NOISE 2013; Innsbruck; Austria; 15 September 2013 through 18 September 2013

Vol. 3 2345-2352



Building Futures


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