Analysis of Aircraft Noise Levels in the Vicinity of Start-of-Takeoff Roll at Baltimore-Washington International Airport.

摘要

The sound level prediction accuracy of the Federal Aviation Administration's Integrated Noise Model (INM) is receiving closer scrutiny today than at its inception due to a shifting emphasis in the model's application. In addition to the traditional land use planning application, the INM is now used as resource arbiters for local and federally funded noise mitigation programs. The increased model scrutiny has led to a reinspection of modeling assumptions in the vicinity of start-of-takeoff roll and the subsequent need for a well documented empirical database. The study focused on the gathering of such a database. The completed database consists of measured sound exposure levels (SELs) and maximum A-weighted sound levels at five sites in the hemicircle behind the aircraft at brake release and at distances of 2,000 to 4,000 ft from the brake release point. Independent variables include measurement site/runway geometry, aircraft type, engine type, aircraft gross weight, wind speed and direction, temperature, relative humidity, barometric pressure, aircraft ground roll distance versus time, and time to liftoff. The information is all contained in standard dBase III database files. Findings shown in the report include the effects on SEL of wind speed and direction, and the interaction effects of wind speed direction and measurement site location. Also discussed are comparisons of measured SELs and the predicted values of INM Version 3.10.