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Improved methods for calculating the thickness noiseAdvanced methods to compute the rotor thickness noise which is predominant in the case of high speed rotor were developed. These methods were deduced from a previous method by transforming the integral coordinate, commuting the order of integration and differential, and/or performing chordwise integration analytically with some adequate assumption. The necessary computational times and waveforms obtained by the previous and three advanced methods were compared. It was then concluded that the advanced methods could save the computational time compared with the previous method with the same accuracy.
Document ID
19780024889
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Nakamura, Y.
(Tokyo Univ.)
Azuma, A.
(Tokyo Univ.)
Date Acquired
August 9, 2013
Publication Date
August 1, 1978
Publication Information
Publication: NASA. Langley Res. Center Helicopter Acoustics
Subject Category
Acoustics
Accession Number
78N32832
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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