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Acoustic Beamforming: Mapping Sources of Truck Noise (2009)

Chapter: Appendix A - Array Microphone Coordinates

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Suggested Citation:"Appendix A - Array Microphone Coordinates." National Academies of Sciences, Engineering, and Medicine. 2009. Acoustic Beamforming: Mapping Sources of Truck Noise. Washington, DC: The National Academies Press. doi: 10.17226/14311.
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Page 75

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75 A P P E N D I X A Array Microphone Coordinates Microphone Number x (m) y (m) Microphone Number x (m) y (m) 1 -0.204 0.465 40 0.490 -1.134 2 -0.276 0.632 41 0.113 -0.672 3 -0.347 0.799 42 0.152 -0.911 4 -0.418 0.966 43 0.191 -1.150 5 -0.490 1.134 44 0.230 -1.389 6 -0.113 0.672 45 0.269 -1.628 7 -0.152 0.911 46 0 -0.746 8 -0.191 1.150 47 -0.001 -1.010 9 -0.230 1.389 48 -0.002 -1.273 10 -0.269 1.628 49 -0.003 -1.537 11 0 0.746 50 -0.005 -1.801 12 0.001 1.010 51 -0.113 -0.672 13 0.002 1.273 52 -0.154 -0.908 14 0.003 1.537 53 -0.195 -1.145 15 0.005 1.801 54 -0.236 -1.381 16 0.113 0.672 55 -0.278 -1.616 17 0.154 0.908 56 -0.204 -0.465 18 0.195 1.145 57 -0.277 -0.627 19 0.236 1.381 58 -0.350 -0.789 20 0.278 1.616 59 -0.423 -0.951 21 0.204 0.465 60 -0.496 -1.112 22 0.277 0.627 61 -0.254 -0.166 23 0.350 0.789 62 -0.345 -0.222 24 0.423 0.951 63 -0.435 -0.278 25 0.496 1.112 64 -0.525 -0.333 26 0.254 0.166 65 -0.615 -0.387 27 0.345 0.222 66 -0.254 0.166 28 0.435 0.278 67 -0.344 0.227 29 0.525 0.333 68 -0.434 0.289 30 0.615 0.387 69 -0.524 0.351 31 0.254 -0.166 70 -0.613 0.414 32 0.344 -0.227 71 0 -0.241 33 0.434 -0.289 72 0 0 34 0.524 -0.351 73 0 0.241 35 0.613 -0.414 74 0 -0.467 36 0.204 -0.465 75 0 -0.114 37 0.276 -0.632 76 0 0.114 38 0.347 -0.799 77 0 0.467 39 0.418 -0.966 – – – Horizontal (x) and vertical (y) coordinates, in meters, of microphones vs. array center (0;0)

Next: Appendix B - Vertical Distributions of Noise Sources for Heavy Trucks »
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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 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.

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