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In Flight Measurement Of Propeller Noise On The Fuselage Of An Airplane
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722486471 Total Pages :58 pages Book Rating :4.4/5 (864 download)
Book Synopsis In-Flight Measurement of Propeller Noise on the Fuselage of an Airplane by : National Aeronautics and Space Administration (NASA)
Download or read book In-Flight Measurement of Propeller Noise on the Fuselage of an Airplane written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: In-flight measurements of propeller noise on the fuselage of an OV-10A aircraft were obtained using a horizontal and a vertical microphone array. A wide range of flight conditions were tested including changes in angle of attack, sideslip angle, power coefficient, helical tip Mach number and advance ratio, and propeller direction of rotation. Results show a dependence of the level and directivity of the tones on the angle of attack and on the sideslip angle with the propeller direction of rotation, which is similar to results obtained in wind tunnel tests with advanced propeller designs. The level of the tones at each microphone increases with increasing angle of attack for inboard-down propeller rotation and decreases for inboard-up rotation. The level also increases with increasing slideslip angle for both propeller directions of rotation. Increasing the power coefficient results in a slight increase in the level of the tones. A strong shock wave is generated by the propeller blades even at relatively low helical tip Mach numbers resulting in high harmonic levels. As the helical tip Mach number and the advance ratio are increased, the level of the higher harmonics increases much faster than the level of the blade passage frequency. Pla, Frederic G. and Ranaudo, Richard and Woodward, Richard P. Glenn Research Center...
Book Synopsis In-flight Measurement of Propeller Noise on the Fuselage of an Airplane by :
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