Accession Number : ADA310795

Title :   Feasibility Analysis of a Noisemap Calculation Procedure for Helicopter and VTOL Aircraft Noise Exposure.

Descriptive Note : Rept. for May 93-Feb 94,

Corporate Author : WYLE LABS EL SEGUNDO CA

Personal Author(s) : Brown, D. ; Boulton, C. L.

PDF Url : ADA310795

Report Date : JUN 1996

Pagination or Media Count : 26

Abstract : The current NOISEMAP programs, including BASEOPS, Master Control Module (MCM), OMEGA 10 and 11 and NOISEMAP/NOISEFILE, are tailored to be applicable to fixed-wing aircraft operations and corresponding maintenance run-ups at airbases with runways. The programs can be and have been used for helicopter operations but are not well suited to this use in their present form. It is recommended that NOISEMAP be adapted to include an optional selection of helicopter applicability, the results of which can be noise contour plotted as a stand-alone case or in conjunction ('energy-added') with other fixed-wing aircraft cases. It is recommended that the NOISEMAP development be peformed in two phases: Phase 1 would include revisions to BASEOPS, MCM and NOISEMAP to allow current NOISEFILE helicopter data to be better and most conveniently utilized for assembling and running helicopter operational cases. These revisions would include assembling a standardized set of helicopter operating conditions for which SEL versus distance files can be generated by OMEGA 10 and 11 by reference to the existing NOISEFILE data. Phase 2 would be an upgrade to the Phase 1 program to include refinements specific to helicopter noise, such as in-flight directivity effects, modified lateral attenuation models, an enhanced database for additional power/flight conditions (to replace surrogate files) and an increased compatibility with the DOT/FAA Heliport Noise Model.

Descriptors :   *HELICOPTERS, *NOISE POLLUTION, *AIRCRAFT NOISE, COMPUTER PROGRAMS, DATA BASES, ENVIRONMENTAL IMPACT, FEASIBILITY STUDIES, TAKEOFF, ACOUSTIC MEASUREMENT, ACOUSTIC ATTENUATION, COMPUTER FILES, FLIGHT PATHS, ACOUSTIC DATA, SOUND PRESSURE, AIRCRAFT LANDINGS, VERTICAL TAKEOFF AIRCRAFT, PSYCHOACOUSTICS, SOUND RANGING, APPROACH, HELIPORTS.

Subject Categories : Helicopters
      Noise Pollution and Control
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE