NASA NTRS · 19790002674
Rating helicopter noise
Abstract
The effectiveness of the EPNL procedure in quantifying helicopter blade slap and tail rotor noise heard on approach some distance from the flyover position is addressed. Alternative methods of rating helicopter noise are reviewed including correction procedures to the EPNL concept which account for blade slap and tail rotor noise. The impact of the use of such corrections is examined.
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Leverton, J. W., Southwood, B. J., Pike, A. C.. 1978-08-01. Rating helicopter noise. https://ntrs.nasa.gov/citations/19790002674
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