INTERIOR NOISE ANALYSIS AND CONTROL FOR LIGHT AIRCRAFT

This paper describes experimental and analytical studies of the interior noise of twin-engine, propeller-driven, light aircraft. Experimental results indicate that interior noise levels due to propeller noise can be reduced by reduction of engine rpm at constant airspeed (about 3 dB), by synchronization of the twin engines/propellers (up to 12 dB), and by increasing the distances from propeller tip to fuselage. The analytical model described uses modal methods and incorporates the flat-sided geometrical and skin-stringer structural features of light aircraft. Initial results show good agreement with measured noise transmitted into a rectangular box through a flat panel.

• Supplemental Notes:
  • Prepared for SAE Meeting 28 Feb-4 March, 1977.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Mixson, J S
  • Vaicaitis, R
  • Barton, C K
• Publication Date: 1977

Media Info

• Features: References;
• Pagination: 12 p.

Subject/Index Terms

• TRT Terms: Acoustics; Aircraft; Aircraft cabins; Aircraft noise; Cavitation noise; Engines; Fuselages; Mathematical models; Measurement; Noise control; Private aircraft; Propeller driven aircraft; Small aircraft
• Uncontrolled Terms: Aircraft engines; Models; Noise reduction
• Old TRIS Terms: Acoustic variables measurement
• Subject Areas: Aviation; Vehicles and Equipment;

Filing Info

• Accession Number: 00170197
• Record Type: Publication
• Source Agency: Engineering Index
• Report/Paper Numbers: SAE 770445 Preprint
• Files: TRIS
• Created Date: Jan 30 1978 12:00AM