详情

原文传递 Acoustic Beamforming: Mapping Sources of Truck Noise. NCHRP Report 635.

题名：	Acoustic Beamforming: Mapping Sources of Truck Noise. NCHRP Report 635.
作者：	Y. A. Gurovich; K. J. Plotkin; D. H. Robinson; W. Blake; P. R. Donavan;
关键词：	acoustic measurement,beam forming,trucks,traffic noise;acoustic arrays, noise levels, pavements, highway design, tires, noise pollution control, noise reduction;
摘要：	Heavy trucks are significant contributors to overall traffic noise levels. At highway speeds, the noise level produced by heavy trucks is about 10 dB greater than that of light vehicles. As a result, every heavy truck in the traffic flow contributes the same amount to the average noise level values as 10 light vehicles. Because of this significant contribution, a thorough understanding of the trucks as a noise source is crucial to the prediction and mitigation of traffic noise. Noise from heavy trucks originates from a variety of sources, which include exhaust stack outlet, muffler shell, exhaust pipes, engine block, air intake, cooling fan, tires, and aerodynamics. The relative contributions of these sources vary with vehicle type, operating condition, and (for tire noise) the type of pavement. / Supplementary Notes: Prepared in cooperation with Blake (William), Bethesda, MD. and Illingworth and Rodkin, Inc., Petaluma, CA. Sponsored by American Association of State Highway and Transportation Officials, Washington, DC. and Federal Highway Administration, Washington, DC. / Availability Note: Order this product from NTIS by: phone at 1-800-553-NTIS (U.S. customers); (703)605-6000 (other countries); fax at (703)605-6900; and email at orders@ntis.gov. NTIS is located at 5301 Shawnee Road, Alexandria, VA, 22312, USA.
报告类型：	科技报告