Updated Computer Programs for Predicting Single Event Aircraft Noise Data forSpecific Engine Power and Meteorological Condition

摘要

This report documents OMEGA 10.8 program and OMEGA 11.3 program. These programswere developed to prepare flight and ground run-up noise data for input to NOISEMAP, the Air Force community noise exposure prediction program. All subroutines are documented at a level useful to a programmer working with the code or a reader interested in a general overview of a specific subroutine. The OMEGA 10 program inputs reference flyover datasets from the NOISEFILE database for a specific aircraft, extrapolates the reference sound pressure level (SPL) data from the reference minimum slant range (1000 feet to 22 profile distances (200 to 25000)), computes the single event measures at these distances, and then applies a set of rules to extrapolate or interpolate these single event versus distance data to produce distance profiles for single event noise measures at the requested power setting, airspeed, temperature and relative humidity The OMEGA 11 program inputs reference ground run-up datasets from the NOISEFILE database for a specific aircraft. extrapolates these SPL spectra from the reference distance (250 feet) to each of the 22 profile distance, computes the single event measures for each spectrum at each distance at the requested temperature, relative humidity, barometric pressure and aircraft engine power setting. (AN).