Details:

Creators:
Fleming, G G ; Rickley, E J
Fleming, G G ; Rickley, E J Less -
Corporate Creators:
John A. Volpe National Transportation Systems Center (U.S.)
Subject/TRT Terms:
[+]
Absorptive Treatment Computer Programs Effectiveness Field Tests Forecasting Insertion Loss Measures Of Effectiveness Noise Barriers Parallel Noise Barriers Performance Prediction Reflection Tilting Traffic Noise
Publication/ Report Number:
FHWA-RD-90-105;DOT-TSC-FHWA-90-1
Resource Type:
Tech Report
Geographical Coverage:
Virginia
TRIS Online Accession Number:
00496588
OCLC Number:
22205638
Corporate Publisher:
United States. Federal Highway Administration
NTL Classification:
NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-ENERGY AND ENVIRONMENT-Aviation Energy and Environment;NTL-ENERGY AND ENVIRONMENT-Environment Impacts;NTL-AVIATION-Aviation Energy and Environment;NTL-AVIATION-Aviation Planning and Policy;
Abstract:
In an effort to minimize the cost and maximize the effectiveness of highway noise barriers, the Federal Highway Administration and a National Pooled Fund Panel (made up of 14 States) funded a field study program on an experimental highway noise barrier. A test barrier was constructed in 1984 at a site at Dulles International Airport in Chantilly, Virginia. The study, conducted from May 1989 to August 1989 by the U.S. Department of Transportation, Research and Special Programs Administration, Transportation Systems Center, focused on the use of absorptive treatment and tilting as a means of improving the insertion loss (specifically, single event moving point source insertion loss) of two parallel highway noise barriers. Measurements were conducted with both controlled moving point sources (trucks) and an artificial fixed-point source (speaker system). Results show: (1) the addition of absorptive treatment to the roadside face of two vertical, parallel, highway noise barriers eliminated multiple reflections and was found to improve the insertion loss (2 dB to 6 dB); (2) tilting proved to be an effective alternative to absorptive treatment in eliminating the multiple reflections and subsequent degradation in performance of two vertical reflective barriers; (3) additional verification needs to be performed with an artificial fixed-point source before it can be recommended as a viable alternative to actual highway traffic in measuring barrier effectiveness; and (4) although the "BARRIER 2.1" computer program cannot model the Dulles test situation exactly, and actual ground impedance data were not available, the trends in the predicted insertion loss data were in good agreement with the predicted results although lower in absolute level.
Format:
PDF
Funding:
HW027/H0003/4E7B1112
Collection(s):
Federal Highway Administration Volpe
Main Document Checksum:
[+]
urn:sha256:ae6a498b5ea0021d818912118ed807177045734692a0e2f701fbd4816e318d59
Download URL:
https://rosap.ntl.bts.gov/view/dot/8968/dot_8968_DS1.pdf
File Type:

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