Author : Paul R. Donavan
Publisher :
ISBN 13 : 9780309446181
Total Pages : 83 pages
Book Rating : 4.4/5 (461 download)
Book Synopsis Mapping Heavy Vehicle Noise Source Heights for Highway Noise Analysis by : Paul R. Donavan
Download or read book Mapping Heavy Vehicle Noise Source Heights for Highway Noise Analysis written by Paul R. Donavan and published by . This book was released on 2017 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "NCHRP Research Report 842 deals with two primary objectives: (1) determining height distributions and spectral content for heavy vehicle noise sources and (2) establishing and beginning development of an extended heavy vehicle (truck and bus) noise source database for incorporation into traffic noise models, including future versions of the Federal Highway Administration (FHWA) Transportation Noise Model (TNM) acoustical code. To accomplish these objectives, the researchers collected data by sampling commonly used heavy vehicles representing the current national fleet across the country. The research used data collection and analysis methods reflecting the current state of technology in acoustic beamforming. Heavy vehicles (trucks and buses) are significant contributors to overall traffic noise levels; noise from one heavy truck is equivalent to noise from about 10 passenger cars. Therefore, a thorough understanding of how heavy vehicles emit noise is crucial to predicting and mitigating traffic noise. In addition, noise from heavy vehicles comes from various sources (e.g., exhaust stacks, muffler shells, exhaust pipes, drivetrains, air intakes, cooling fans, tires, and aerodynamic characteristics). The relative contributions of these sources vary with vehicle type, operating conditions, and (for tire noise) the type of pavement. Understanding how these components contribute is important to being able to forecast heavy vehicle contribution to overall traffic noise."