NOISE REDUCTION FOR BUSINESS JET AIRCRAFT

An analysis is made of the noise reduction potential for the business jet aircraft fleet registered in the United States as of 1975. Noise characteristics of each aircraft are defined at various thrust levels and noise reductions achievable for different design options are determined. Costs and performance penalties are assessed for each option in order to evaluate the consequences of lowering present FAR 36 Appendix C noise levels. With current technology, the exhaust noise of all engines can be reduced significantly with multi-element nozzles, but the addition of a lined ejector provides little additional noise reduction at greatly increased weight and performance penalties. Acoustic liners in exhaust ducts reduce fan or core noise for some engines but inlet liners have little value. Equipping aircraft with new engines achieves major noise reductions but is technically and economically reasonable for only about twenty percent of existing business jet aircraft. To assess noise reductions, a single number criterion is proposed, based on the effective perceived noise level contour that circumscribes a two square-mile area. Also it is recommended that takeoff noise be measured at 2.5 nautical miles from brake release.

• Corporate Authors:

  Bolt, Beranek and Newman, Incorporated

  21120 Vanowen Street
  Canoga Park, CA  United States  91303
• Authors:
  • Galloway, W J
  • Wilby, J F
  • Gordon, C G
  • Mills, J F
• Publication Date: 1976-10

Media Info

• Pagination: 234 p.

Subject/Index Terms

• TRT Terms: Aircraft noise; Analysis; Business aircraft; Costs; Emission control systems; Exhaust gases; Jet engines; Jet propelled aircraft; Noise; Noise control; Retrofitting; Sound level
• Uncontrolled Terms: Cost analysis; Noise reduction
• Old TRIS Terms: Jet engine noise
• Subject Areas: Aviation; Environment; Finance; Vehicles and Equipment;

Filing Info

• Accession Number: 00143958
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: BBN-3284 Final Rpt., FAA-RD-76-125
• Contract Numbers: DOT-FA75WA-3668
• Files: NTIS, TRIS
• Created Date: Dec 15 1977 12:00AM