A new design procedure of a half-plane noise barrier with a non-straight top edge

Takauyki Hidaka

This paper introduces noise reduction of the "noise barrier with a non-straight top edge" that has a periodic structural feature on its top edge along the length. The top edge geometry of this noise barrier is created by optimization of the diffracted sound field based on the Maggi-Rubinowicz theory. To further enhance the noise barrier performance, the rear of the top edge is covered with porous sound-absorbing material. The excellence of this complex system is improvement of its noise reduction by over about 3 to 5 dB at the point behind the barrier in frequency ranges from 125 Hz to over 4 kHz compared with an ordinary noise barrier of the same height. It will not create a zone in which sound is augmented, either. Originally designed primarily for temporary hoarding at a construction site, this noise barrier is expected to effectively serve against a wide range of noise sources. This paper reports a case example of use of this noise barrier and outlines the characteristics of its noise reduction performance and mechanism.

Mots clés: Barrier; Jugged edge

Domaines: Acoustique [physics.class-ph]

Takauyki Hidaka. A new design procedure of a half-plane noise barrier with a non-straight top edge. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00810674⟩