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Full-scale Rotorcraft Broadband Noise Prediction and its Relevance to Civil Noise Certification Criteria



Full-scale Rotorcraft Broadband Noise Prediction and its Relevance to Civil Noise Certification Criteria

  • Presented at Forum 69 - Best Paper for this session
  • 15 pages
  • SKU # : 69-2013-181

  • Your Price : $30.00
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Full-scale Rotorcraft Broadband Noise Prediction and its Relevance to Civil Noise Certification Criteria

Authors / Details: Kenneth Brentner, The Pennsylvania State University, Royce Snider and Timothy Samuels and Ben Goldman, Bell Helicopter Textron

Abstract: Rotorcraft broadband noise prediction and its relevance to civil noise certification criteria are demonstrated for a full-scalehelicopter. It is shown that prediction of the effective perceived noise level (EPNL) during steady level flight can be signi ficantlyimproved by incorporating rotor broadband noise mechanisms in combination with main and tail rotor discrete frequencynoise sources. EPNL is significantly under-predicted if rotor broadband noise mechanisms and/or tail rotor noisesources are ignored. EPNL for future rotorcraft can be improved if design efforts concentrate on the rotor design parameters(in order of priority) that effect: 1) Tail rotor discrete frequency noise, 2) Main rotor broadband noise, and 3) Main rotor discretefrequency noise.