NDLI: Extrapolation of Maximum Noise Levels From Near-Field Measurements to Far-Field Positions

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Extrapolation of Maximum Noise Levels From Near-Field Measurements to Far-Field Positions

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Bravo, Teresa Ibarra, David Cobo, Pedro
Abstract	The goal of this work is to propose a new strategy for the attenuation of the traffic noise, which constitutes one of the main sources of acoustic pollution in urban and suburban areas. This strategy is based on the measurement of the noise radiated by each individual vehicle using an electro-acoustic system, composed of two microphones for the acquisition of the engine and of the rolling noise. These microphones have been situated inside the engine hood and close to the right back tire respectively. The signals have been recorded for diesel and petrol engines and through typical urban and suburban courses with different persons. Using this procedure, we aim to characterise the drivers responsible of the highest noise levels producing maximum annoyance. The near-field measurements have been then extrapolated to far field positions using an analytical filter that takes into account absorbing properties of the propagation floor. For the internal signal it has been necessary to characterise the acoustic properties of the engine hood experimentally using an array of microphones surrounding the vehicle. The propagated noise is calculated considering the absorption due to the geometrical divergence, the absorption by the air, and the effect of the propagating surface. The signals extrapolated to the receiver position could be compared with the current normative to propose recommendations concerning noise control actions.
Sponsorship	Noise Control and Acoustics Division
Starting Page	169
Ending Page	180
Page Count	12
File Format	PDF
ISBN	9780791845325
DOI	10.1115/NCAD2012-0517
Volume Number	ASME 2012 Noise Control and Acoustics Division Conference
Conference Proceedings	ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012
Language	English
Publisher Date	2012-08-19
Publisher Place	New York City, New York, USA
Access Restriction	Subscribed
Subject Keyword	Noise (sound) Absorption Acoustics Diesel Signals Cities Acoustical properties Engines Microphones Vehicles
Content Type	Text
Resource Type	Article

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