The goal of this study was to obtain significant noise reduction (10 dB, if poosible) at the upper floors of the two-story homes adjacent to the Harbor tunnel thruway in Baltimore, Maryland. To that end, an acoustical scale model study was proposed; this allowed simulation of the salient physical features of the roadway. A one-block section of the community was modeled to examine the effectiveness of sloped barriers and to determine the optimum location and slope angle for the barriers. The model results were then applied to the entire four-block study area and through computer annalysis, a complete system of noise barriers was designed for effective noise control in the community. Poor performance was obtained when the barriers were vertical (0 degrees). As the barriers were sloped back, however, the insertion loss increased to a maximum att 10 degrees of slope and dropped to lower values at greater angles. Although sloped barriers were not tested for other roadway geometries, it is expected that they can be used on other roadways with similar noise problems. Model studies would generally be required to determine optimum location and slope angles, at least until enough data are collected to merit generalizations. In this one case, however, sloped barriers offered a cost-effective alternative to absorptive, parallel barriers.

  • Availability:
  • Corporate Authors:

    Purdue University

    Ray W. Herrick Laboratories
    140 S Martin Jischke Drive
    West Lafayette, IN  United States  47906
  • Authors:
    • MENGE, C W
  • Publication Date: 1980-3

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 64-78
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00319860
  • Record Type: Publication
  • Source Agency: National Safety Council Safety Research Info Serv
  • Files: TRIS
  • Created Date: Feb 6 1981 12:00AM