NCHRP Report 635:

Acoustic Beamforming: Mapping Sources of Truck Noise

Status: Not for Sale

Size: 89 pages, 8.5 x 11

Publication Year:2009

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Authors:
Paul R Donavan; Yuriy A Gurovich; Kenneth J Plotkin; Daniel H Robinson; William K Blake; Transportation Research Board
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TRB's National Cooperative Highway Research Program (NCHRP) Report 635: Acoustic Beamforming: Mapping Sources of Truck Noise explores the acoustic beamforming technique in an attempt to pinpoint and measure noise levels from heavy truck traffic. The beamforming technique uses an elliptical ...
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Table of Contents
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Front Matter	i-ix
Summary	1-5	(skim)
1.2 Heavy Truck Noise Sources	6-6	(skim)
1.3 Source Identification Methods	7-8	(skim)
1.4 Objective and Scope of Research	9-9	(skim)
Task 5. Execute Testing Plan	10-10	(skim)
Task 9. Submit Final Report	11-11	(skim)
3.2.1 Noise Mapping Technique Development	12-12	(skim)
3.2.2 Microphone Array Design	13-13	(skim)
3.2.3 Balance Between Array Aperture and Spherical Spreading Loss	14-16	(skim)
3.2.4 Design Conclusions	17-18	(skim)
3.3.3 Preliminary Testing	19-19	(skim)
3.4.1 Low-Speed Tests	20-21	(skim)
3.4.2 High-Speed Tests	22-22	(skim)
3.4.3 Passby and Intensity Measurements	23-30	(skim)
3.5.1 Beamformer Calibrations with Spherical Source	31-33	(skim)
3.5.2 Benchmark Measurements of Spherical Source on Moving Truck with Competing Truck Noise	34-34	(skim)
3.5.3 Benchmark Parallel Array-Based and Acoustic Intensity Measurements for Stationary Trucks	35-40	(skim)
3.5.4.1 Analysis Technique for Low- and High-Speed Track Passbys	41-43	(skim)
3.5.4.2 Passby Evaluations of the 5900i Truck: Localization of Engine Compartment and Tire Noise	44-45	(skim)
3.5.4.3 Passby Evaluations of the 9200i Truck: Localization of Engine Compartment and Exhaust Noise	46-47	(skim)
3.5.4.4 Evaluations of the Truck Acoustic Source Level During Passby as a Function of Vertical Elevation	48-52	(skim)
3.6.2 Data Post-Processing Algorithm Modifications	53-53	(skim)
3.6.4 Roadside Measurement Setup	54-54	(skim)
3.7.2 Image Results of the Vehicle Passbys	55-67	(skim)
3.7.3 Example Model of Truck Sources for Simulating Noise Propagation Results of the Vehicle Passbys	68-70	(skim)
4.2 Recommendations	71-72	(skim)
References	73-74	(skim)
Appendix A - Array Microphone Coordinates	75-75	(skim)
Appendix B - Vertical Distributions of Noise Sources for Heavy Trucks	76-77	(skim)
Appendix C - Glossary of Special Terms	78-79	(skim)
Abbreviations used without definitions in TRB publications	80-80	(skim)

Description

TRB's National Cooperative Highway Research Program (NCHRP) Report 635: Acoustic Beamforming: Mapping Sources of Truck Noise explores the acoustic beamforming technique in an attempt to pinpoint and measure noise levels from heavy truck traffic. The beamforming technique uses an elliptical array of more than 70 microphones and data acquisition software to measure noise levels from a variety of noise sources on large trucks—including the engine, tires, mufflers, and exhaust pipes.

NCHRP Report 635:

Acoustic Beamforming: Mapping Sources of Truck Noise

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