The Effect of Test-Site Topography in Vehicle Noise Measurements

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Abstract
The interference between sound waves directly propagated to a microphone and those reflected from the ground plane is known to influence test results. This situation is typical of vehicle pass-by noise testing, where the microphone is located 50 ft from the lane of travel and a hard surface extends from the vehicle to the microphone. Theory and data are presented indicating that small differences in ground-plane flatness and absorption can significantly alter test results. The need to specify surface flatness and absorption in test procedures is indicated.

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