Acoustic Beamforming: Mapping Sources of Truck Noise (2009) / Chapter Skim
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1.2 Heavy Truck Noise Sources Noise from heavy trucks originates from a variety of sources: • Exhaust stack outlet • Muffler shell C H A P T E R 1 Background
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1.3 Source Identification Methods During development of EPA's heavy truck noise regulations (12) , extensive studies were conducted on truck noise sources.
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The results of these works clearly indicated the source regions and compared well with similar localization studies performed using sound intensity. One of the features of acoustic holography is that the plane of the source distribution can be propagated very close to the source or farther away from the source, to typical passby measurement distances.
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From page 9... ...
The distribution of noise sources on heavy trucks is, in general, considerably more complex and requires additional technique verification. 1.4 Objective and Scope of Research The objective of this study was to use acoustic measurements and noise source mapping techniques to accurately identify, locate, and quantify the noise sources on typical commercial truck and tractor-semitrailer combinations operating in the U.S.
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