Surface noise measurements were made during a joint National Aeronautics and Space Administration (NASA) and Federal Aviation Administration (FAA) program to study the high-altitude, low-frequency acoustic noise propagation characteristics of the Advanced Turboprop (propfan) Aircraft. The measurements were made on October 26-31, 1987 in Huntsville, Alabama and on April 3-13, 1989 at the White Sands Missile Range (WSMR), New Mexico. To effectively compare flight-to-flight data as received on the ground, the procedures and practices of Federal Air Regulation (FAR) Part 36 were used as a guide in adjusting the measured ground data at the time of LA(sub MAX) to a set of reference conditions. After the data for each event were processed using slow detector characteristics, the data record at LA(sub MAX) was then identified and the coordinates of the aircraft at the time of emission were calculated, taking into account atmospheric refraction effects. The effects of atmospheric absorption through the test day and reference day atmosphere were also taken into account and the 1/3-octave data were adjusted accordingly.
En Route Noise: NASA Propfan Test Aircraft (Corrected Data - Simplified Procedure)
1990
10 pages
Report
Keine Angabe
Englisch
Air Transportation , Acoustics , Noise Pollution & Control , Ground tests , NASA programs , Noise measurement , Noise propagation , Procedures , Prop-fan technology , Propeller fans , Routes , Atmospheric attenuation , Atmospheric refraction , Data acquisition , High altitude , Low frequencies , Turboprop aircraft , Aircraft noise
Overview of NASA PTA propfan flight test program
NTRS | 1987
|Overview of NASA PTA Propfan Flight Test Program
NTIS | 1990
|Reduced Noise in Interiors of Propfan Aircraft
Emerald Group Publishing | 1988