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Parallel Barrier Effectiveness

其他書名	Dulles Noise Barrier Project
出版	Federal Highway Administration, Office of Engineering and Highway Operations Research and Development, 1990
URL	http://books.google.com.hk/books?id=HwI6AQAAMAAJ&hl=&source=gbs_api

註釋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).