

	Mechanics På svenska

Project

Diffraction of sound by noise barriers

Research Area:

Theoretical and computational mechanics

Project Members:

Enflo, B.O.

Pavlov, I.

Sandqvist, H.

Sponsor:

BFR, KFB

Project Description

Noise from traffic, fans, motors etc. is often shielded by barriers. In normal design the top edge of a noise barrier is straight. The edge may act as a string of highly correlated point sources. The effectiveness of the barrier is reduced by the coherence of these secondary sources. Experiments at The University of Texas show that the effectiveness of the barrier can be increased if it is made irregular. The project aims at understanding of these phenomena by theoretical methods. It will continue with theoretical and experimental investigations of possibilities of increasing the effect of sound barriers.

Publications related to the project

Year	Title
1998	Diffraction of sound against barrers with simple edge profiles. NAM 98, Proc. of the Nordic Acoustic Meeting, Stockholm 7-9 Sept. 1998 97-99 (Published)
1998	Diffraction of sound against barriers with simiple edge profiles Proc. of the 21th Scandinavian Symposium on Physical Acoustics, 1-4 Feb., 1998 (Published)

Internal Reports related to the project

Year	Title	Document Type
1999	Diffraction of sound from a point source against screens with periodical edge profiles	Licentiate thesis