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Projects - National Aeronautical and Space Administration (NASA)

Behind Start of Takeoff Roll Noise Measurement Study, 2005

The Society of Automotive Engineers (SAE) Aircraft Noise Committee (A-21) initiated an activity to update the behind start of take-off roll relationships used in the SAE Aerospace Information Report (AIR) 1845. AIR-1845, published in 1986, is the foundation on which the FAA's Integrated Noise Model is based, as well as many other aircraft noise prediction models. The National Aeronautics and Space Administration (NASA) and Volpe Acoustics recently undertook a measurement and analysis study to investigate and modernize the behind start of takeoff roll algorithm documented in the report, "Analysis of Selected Topics in the Methodology of the Integrated Noise Model" and widely utilized by users of SAE-AIR-1845 (AIR-1845).

Sponsors: NASA, Langley Research Center

Modeling Ground Attenuation of Aircraft Noise, 1998-2000

Aircraft noise is attenuated by the acoustical characteristics of the ground. Although much work has been done to quantify attenuation over ground as it relates to aircraft, there continue to be discrepancies between predicted and measured noise levels, especially for aircraft at low altitudes, where ground effects are most prominent. This is even more of an issue at airports surrounded by acoustically varying ground, e.g., airports surrounded by both water and grass. INM Version 6.0 will include recently developed regression equations (based on acoustic propagation theory) to predict attenuation of aircraft noise levels over virtually all types of ground, including water. In support of NASA, the goal of this study will be to validate the regressions, and to improve understanding of attenuation of aircraft noise over acoustically varying ground. Measurements will be performed at sites in the vicinity of Logan International Airport, noted for it's vast areas of acoustically varying ground.

Sponsor: NASA, Langley Research Center