Accession Number:

ADA012371

Title:

Commercial Aircraft Noise Definition - L1011 Tristar. Volume 1

Descriptive Note:

Final rept. Jun 1973-Sep 1974

Corporate Author:

LOCKHEED-CALIFORNIA CO BURBANK

Personal Author(s):

Report Date:

1974-09-01

Pagination or Media Count:

86.0

Abstract:

Calculation procedures to describe airplane noise during takeoff and approach have been programmed for batch operation on a large digital computer. Three routines are included. The first normalizes far-field noise spectra to reference conditions and then determines spectra at various distances from the airplane, for airport elevations between sea level and 6000 feet and ambient temperatures between 30 deg F and 100 deg F. Overall sound pressure levels, A-weighted noise levels, perceived noise levels, and effective perceived noise levels are calculated. The second routine uses aerodynamic and engine thrust data to produce takeoff and approach flight path description. The basic takeoff is at equivalent airspeed, with thrust reduction or acceleration option after gear-up. The approach is along any constant glide slope between 3 and 6 degrees at constant airspeed, with a two-segment option. The last routine combines noise propagation and flight path information to produce constant noise contour footprints. The program has been exercised on Lockheed L-1011-1 TristarRolls-Royce RB.211-22 data, providing results in EPNdB and dBA.

Subject Categories:

  • Civilian Aircraft
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE