Evaluating Sound Absorption in Situ using "ADRIENNE"

This paper describes how there is a need for a procedure that allows for the field-testing of absorption characteristics of both absorptive highway noise barriers and pavement types. This is quite necessary for both products because there is uncertainty of laboratory results as applied to the finished in-field product, and there is only a slim chance that the tested product will be that product that is placed in the field, because of the physical size of the objects, and there is no other way to easily make these measurements under high background noise conditions that are usually produced by the traffic itself. For barriers and pavements, local parameters, differences in mix, actual construction techniques, and differences in materials could cause the absorptive capabilities of the component to vary. The end result would be uncertainty in the actual local sound levels as compared to those predicted. This procedure helps to verify that the results achieved in the field match those in the lab. Any in-situ absorptive test method must be able to be used in high background noise environments. The low background noise levels on unused roadways present less problems but these are not the crucial areas where reflections are important. Additionally, degradation with time is also of importance. In either case, closing of any heavily traveled roadway is undesirable and may not be practical. One approach that seems to hold promise for this type of testing and may be used in high background noise environments is the Adrienne method. This paper provides an overview of the method and presents the results of preliminary testing.

Language

  • English

Media Info

  • Media Type: CD-ROM
  • Features: Figures; Photos; References;
  • Pagination: pp 567-573
  • Monograph Title: Noise-Con 04. The 2004 National Conference on Noise Control Engineering

Subject/Index Terms

Filing Info

  • Accession Number: 01054335
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 25 2007 2:10PM