Download or read book Comparison of Measured and Calculated Helicopter Rotor Impulsive Noise wind Tunnel Test Data and Prediction Analysis Techniques written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-26 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thickness noise theory is discussed. Two full-scale rotors were tested in a wind tunnel with several tips involving changes in chord, thickness, and sweep. Impulsive noise data reduction procedures used are described. The calculated and measured impulsive noise peak pressures as a function of advancing tip Mach number are compared, showing good correlation for all rotors considered. Johnson, W. and Lee, A. Ames Research Center NASA-TM-78473, A-7355 NAS2-9399; RTOP 505-10-21
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