Author: David A. McCurdyPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 82
Book Description
Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Comparison of Different Propeller Configurations
Author: David A. McCurdyPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 82
Book Description
Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise
Author: David A. McCurdyPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 48
Book Description
Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-rotating-propeller Configuration
Author: David A. MacCurdyAnnoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-Rotating-Propeller Configuration
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781730842986
Category : Science
Languages : en
Pages : 92
Book Description
Two experiments were conducted to quantify the annoyance of people to flyover noise of advanced turboprop aircraft with counter rotating propellers. The first experiment examined configurations having an equal number of blades on each rotor and the second experiment examined configurations having an unequal number of blades on each rotor. The objectives were to determine the effects on annoyance of various tonal characteristics, and to compare annoyance to advanced turboprops with annoyance to conventional turboprops and turbofans. A computer was used to synthesize realistic, time-varying simulations of advanced turboprop aircraft takeoff noise. The simulations represented different combinations fundamental frequency and tone-to-broadband noise ratio. Also included in each experiment were recordings of 10 conventional turboprop and turbofan takeoffs. Each noise was presented at three sound pressure levels in an anechoic chamber. In each experiment, 64 subjects judged the annoyance of each noise stimulus. Analyses indicated that annoyance was significantly affected by the interaction of fundamental frequency with tone-to-broadband noise ratio. No significant differences in annoyance between the advanced turboprop aircraft and the conventional turbofans were found. The use of a duration correction and a modified tone correction improved the annoyance prediction for the stimuli. Mccurdy, David A. Langley Research Center...
Advanced Turboprop Aircraft Flyover Noise: Annoyance to Counter-rotating-propeller Configurations with a Different Number of Blades on Each Rotor: Preliminary Results
Author: Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Comparison of Different Propeller Configurations
Author: National Aeronautics and Space Adm NasaPublisher: Independently Published
ISBN: 9781730782893
Category : Science
Languages : en
Pages : 78
Book Description
A laboratory experiment was conducted to compare the annoyance of flyover noise from advanced turboprop aircraft having different propeller configurations with the annoyance of conventional turboprop and turbofan aircraft flyover noise. A computer synthesis system was used to generate 40 realistic, time varying simulations of advanced turboprop takeoff noise. Of the 40 noises, single-rotating propeller configurations (8) and counter-rotating propeller configurations with an equal (12) and unequal (20) number of blades on each rotor were represented. Analyses found that advanced turboprops with single-rotating propellers were, on average, slightly less annoying than the other aircraft. Fundamental frequency and tone-to-broadband noise ratio affected annoyance response to advanced turboprops, but the effects varied with propeller configuration and noise metric. The addition of duration corrections and corrections for tones above 500 Hz to the noise measurement procedures improved annoyance prediction ability. Mccurdy, David A. Langley Research Center...
Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise
Author: National Aeronautics and Space Adm NasaPublisher:
ISBN: 9781729393079
Category :
Languages : en
Pages : 44
Book Description
Two experiments were conducted to quantify the annoyance of people to advanced turboprop (propfan) aircraft flyover noise. The objectives were to: (1) determine the effects on annoyance of various tonal characteristics; and (2) compare annoyance to advanced turboprops with annoyance to conventional turboprops and jets. A computer was used to produce realistic, time-varying simulations of advanced turboprop aircraft takeoff noise. In the first experiment, subjects judged the annoyance of 45 advanced turboprop noises in which the tonal content was systematically varied to represent the factorial combinations of five fundamental frequencies, three frequency envelope shapes, and three tone-to-broadband noise ratios. Each noise was presented at three sound levels. In the second experiment, 18 advanced turboprop takeoffs, 5 conventional turboprop takeoffs, and 5 conventional jet takeoffs were presented at three sound pressure levels to subjects. Analysis indicated that frequency envelope shape did not significantly affect annoyance. The interaction of fundamental frequency with tone-to-broadband noise ratio did have a large and complex effect on annoyance. The advanced turboprop stimuli were slightly less annoying than the conventional stimuli. Mccurdy, David A. Langley Research Center RTOP 535-03-11-03...
The Handbook of Hearing and the Effects of Noise
Author: KryterPublisher: BRILL
ISBN: 9004653449
Category : Language Arts & Disciplines
Languages : en
Pages : 687
Book Description
Contains information on the fundamentals of hearing and sound physics. This book offers a review of research findings and concepts on the effects of noise on people. It focuses on the psychological and physiological affects of noise on hearing and performance. It explains the interrelations of various factors involved in making noise a problem.
Author: 
Author: