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Acoustic evaluation of canopy crowns on noise protection walls

In order to obtain a noise assessment of road structures, models for sound emission and sound propagation must be as accurate as possible. Analytical descriptions of noise barriers with tops – crowns – are unknown in the existing national regulations. On behalf of the Federal Highway Research Institute (BASt), the Gesellschaft für Akustikforschung Dresden mbH determined the acoustic effectiveness of a canopy crown installed on the existing noise protection walls of a viaduct. With the metrological proof on a real traffic noise source, predictions of the relevant immission sound pressure level should be possible by using canopy crowns. Within the scope of the investigation, measures were developed which allow a noise assessment of canopy crowns. However, an acoustic effectiveness of the investigated noise protection wall tops beyond the mere increase of the diffraction edge could not be proven.

Additional Information

Research compact 16/2020


Acoustic effectivity of attachments to noise barriers
Reports of the Federal Highway Research Institute, book V 334, 2020

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