Aircraft Configuration Noise Reduction. Volume I. Engineering Analysis.
Final rept. Aug 74-Jun 76,
BOEING COMMERCIAL AIRPLANE CO SEATTLE WASH
Pagination or Media Count:
This report discusses use of wing and fuselage structures as noise barriers for shielding aircraft engine noise from the community. The report concerns use of favorable aircraft configurations for community noise reduction of turbojet and turbofan powered aircraft. Significant noise reduction potential is illustrated on a hypothetical engine-over-wing EOW configuration using high-bypass-ratio turbofan engines. Noise shielding estimation procedures are developed for two types of configuration noise reduction concepts i.e., the EOW and the engine-over-fuselage EOF. Results are described for a theoretical analysis, a major BoeingAeritalia test program, and an empirical analysis of test data. As a result, analytical prediction procedures are defined, computerized, and added to the software previously developed under NASA contract NAS2-6969. The shielding prediction procedures consider individual noise components inlet fan, compressor, exit fan, core, turbine, and jet noise. A new source, jetedge interaction noise, can also be predicted using the procedures. The collective software, incorporating the shielding package of this report, can be used to estimate community noise levels of wing and fuselage shielded turbofan or turbojet noise. This report is presented in three volumes. Volume 1 contains the engineering analysis. Volume 2 contains a Users Guide for computer programs and other appendices. Volume 3 contains the complete computer program listing. Author
- Computer Programming and Software