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NCHRP Report 635: Acoustic Beamforming: Mapping Sources of Truck Noise (2009)
National Cooperative Highway Research Program (NCHRP)

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Donavan, Paul R, Gurovich, Yuriy A, Plotkin, Kenneth J, Robinson, Daniel H, Blake, William K, Transportation Research Board. "Front Matter." NCHRP Report 635: Acoustic Beamforming: Mapping Sources of Truck Noise. Washington, DC: The National Academies Press, 2009.

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IX
Front Matter (R1-R9)
Summary (1-5)
1.2 Heavy Truck Noise Sources (6-6)
1.3 Source Identification Methods (7-8)
1.4 Objective and Scope of Research (9-9)
Task 5. Execute Testing Plan (10-10)
Task 9. Submit Final Report (11-11)
3.2.1 Noise Mapping Technique Development (12-12)
3.2.2 Microphone Array Design (13-13)
3.2.3 Balance Between Array Aperture and Spherical Spreading Loss (14-16)
3.2.4 Design Conclusions (17-18)
3.3.3 Preliminary Testing (19-19)
3.4.1 Low-Speed Tests (20-21)
3.4.2 High-Speed Tests (22-22)
3.4.3 Passby and Intensity Measurements (23-30)
3.5.1 Beamformer Calibrations with Spherical Source (31-33)
3.5.2 Benchmark Measurements of Spherical Source on Moving Truck with Competing Truck Noise (34-34)
3.5.3 Benchmark Parallel Array-Based and Acoustic Intensity Measurements for Stationary Trucks (35-40)
3.5.4.1 Analysis Technique for Low- and High-Speed Track Passbys (41-43)
3.5.4.2 Passby Evaluations of the 5900i Truck: Localization of Engine Compartment and Tire Noise (44-45)
3.5.4.3 Passby Evaluations of the 9200i Truck: Localization of Engine Compartment and Exhaust Noise (46-47)
3.5.4.4 Evaluations of the Truck Acoustic Source Level During Passby as a Function of Vertical Elevation (48-52)
3.6.2 Data Post-Processing Algorithm Modifications (53-53)
3.6.4 Roadside Measurement Setup (54-54)
3.7.2 Image Results of the Vehicle Passbys (55-67)
3.7.3 Example Model of Truck Sources for Simulating Noise Propagation Results of the Vehicle Passbys (68-70)
4.2 Recommendations (71-72)
References (73-74)
Appendix A - Array Microphone Coordinates (75-75)
Appendix B - Vertical Distributions of Noise Sources for Heavy Trucks (76-77)
Appendix C - Glossary of Special Terms (78-79)
Abbreviations used without definitions in TRB publications (80-80)