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Title: IMAGE-3: COMPUTER-AIDED DESIGN FOR PARALLEL HIGHWAY NOISE BARRIERS
Accession Number: 00387626
Record Type: Component
Availability: Find a library where document is available Abstract: Although most state transportation agencies in the United States have constructed traffic noise barriers on new or existing highways, little attention has been given to the problem of multiple reflections between parallel barriers. That is, when barriers are on both sides of a highway, each barrier degrades the other's performance. Thefore, the money spent on the noise-abatement project may not bring the expected benefits that were sought. In other countries, especially in Japan, use of barriers with sound-absorptive faces to counteract this problem is commonplace. Much of this other multiple-reflections analysis and absorptive treatment design has been done through acoustic scale modeling. This technique, when correctly used, is generally beyond the resources of almost all U.S. transportation agencies. There has been no versatile, easy-to-use, parallel barrier analysis and design tool for American designers. The only currently available FHWA procedure, a nomograph, has many constraints that limit its usefulness. Because of a need to consider absorptive treatment for I-440 in Nashville, Vanderbilt University has developed an algorithm and computer program called IMAGE-3 for the analysis of parallel barriers. The algorithm combines the emission, propagation, and diffrection components of the FHWA traffic noise prediction model with geometrical acoustics for addressing the multiple-relection phenomenon. The program overcomes the constraints of the parallel barrier nomograph and permits quick analysis of many situations, including different sound-absorption schemes.
Supplemental Notes: Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Publication of this paper sponsored by Committee on Transportation-Related Noise.
Monograph Title: Monograph Accession #: 00393631
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Bowlby, WilliamCohn, Louis FEditors: Herman, Scott CPagination: p. 52-62
Publication Date: 1983
Serial: ISBN: 0309036534
Features: Figures
(12)
; References
(28)
; Tables
(1)
TRT Terms: Old TRIS Terms: Subject Areas: Design; Environment; Highways
Files: TRIS, TRB
Created Date: Sep 28 1984 12:00AM
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