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    Assessment of the diffraction efficiency of novel barrier profiles using an MLS based approach

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    Publication date
    2009-05-29T09:18:51Z
    Author
    Watts, Gregory R.
    Morgan, P.
    Surgand, M.
    Keyword
    Diffraction efficiency
    Novel barrier profiles
    MLS-based approach
    Peer-Reviewed
    Yes
    
    Metadata
    Show full item record
    Abstract
    In recent years there has been growing interest in the use of noise barrier profiles that can enhance the diffraction efficiency of plane barriers. These are placed on the top of the barrier in order to reduce sound diffracted into the shadow zone. A variety of shapes have been tested including T-shapes, multiple-edges and various cylindrical configurations. Despite numerous demonstrations that the profiles enhance performance there is no universal agreement on how the improvements can be quantified and incorporated into noise prediction models. Without such quantification it is likely that such profiles will not receive widespread acceptance. TRL has carried out an experimental investigation of the performance of novel-shaped barriers for the Transport Research Foundation. The approach relies on quantifying diffraction efficiency in the near field using a novel application of the Maximum Length Sequence (MLS)-based method. Measurements on 4 different profiles were taken in the vertical plane perpendicular to the barrier face. Two source and four receiver positions were used and results were obtained under a range of wind conditions. Results show large differences between the efficiency of the different options with the absorptive T-shaped and multiple-edge profiles performing best.
    URI
    http://hdl.handle.net/10454/2719
    Version
    No full-text available in the repository
    Citation
    Watts, G. R., Morgan, P., Surgand, M. (2004). Assessment of the diffraction efficiency of novel barrier profiles using an MLS based approach. Journal of Sound and Vibration, Vol. 274, No. 3-5, pp. 669-683.
    Link to publisher’s version
    10.1016/j.jsv.2003.05.005
    Type
    Article
    Collections
    Engineering and Informatics Publications

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