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Comparison Of Advanced Turboprop And Conventional Jet And Propeller Aircraft Flyover Noise Annoyance Preliminary Results
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Book Synopsis Advanced Turboprop Aircraft Flyover Noise: Annoyance to Counter-rotating-propeller Configurations with a Different Number of Blades on Each Rotor: Preliminary Results by :
Download or read book Advanced Turboprop Aircraft Flyover Noise: Annoyance to Counter-rotating-propeller Configurations with a Different Number of Blades on Each Rotor: Preliminary Results written by and published by . This book was released on 1988 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Turboprop Aircraft Flyover Noise by : National Aeronautics and Space Adm Nasa
Download or read book Advanced Turboprop Aircraft Flyover Noise written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-22 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory experiment was conducted to quantify the annoyance of people to the flyover noise of advanced turboprop aircraft with counter-rotating propellers (CRP) having a different number of blades on each rotor (nxm, e.g., 10 x 8, 12 x 11). The objectives were: (1) compare annoyance to nxm CRP advanced turboprop aircraft with annoyance to conventional turboprop and jet aircraft; (2) determine the effects of tonal content on annoyance; and (3) determine the ability of aircraft noise measurement procedures and corrections to predict annoyance for this new class of aircraft. A computer synthesis system was used to generate 35 realistic, time-varying simulations of advanced turboprop takeoff noise in which the tonal content was systematically varied to represent combinations of 15 fundamental frequency (blade passage frequency) combinations and three tone-to-broadband noise ratios. The fundamental frequencies, which represented blade number combinations from 6 x 5 to 13 x 12 and 7 x 5 to 13 x 11, ranged from 112.5 to 292.5 Hz. The three tone-to-broadband noise ratios were 0, 15, and 30 dB. These advanced turboprop simulations along with recordings of five conventional turboprop takeoffs and five conventional jet takeoffs were presented at D-weighted sound pressure levels of 70, 80, and 90 dB to 64 subjects in an anechoic chamber. Analyses of the subjects' annoyance judgments compare the three categories of aircraft and examine the effects of the differences in tonal content among the advanced turboprop noises. The annoyance prediction ability of various noise measurement procedures and corrections is also examined. Mccurdy, David A. Langley Research Center RTOP 535-03-11-03...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722051532 Total Pages :34 pages Book Rating :4.0/5 (515 download)
Book Synopsis Advanced Turboprop Aircraft Flyover Noise by : National Aeronautics and Space Administration (NASA)
Download or read book Advanced Turboprop Aircraft Flyover Noise written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-30 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A laboratory experiment was conducted to quantify the annoyance of people to the flyover noise of advanced turboprop aircraft with counter-rotating propellers (CRP) having a different number of blades on each rotor (nxm, e.g., 10 x 8, 12 x 11). The objectives were: (1) compare annoyance to nxm CRP advanced turboprop aircraft with annoyance to conventional turboprop and jet aircraft; (2) determine the effects of tonal content on annoyance; and (3) determine the ability of aircraft noise measurement procedures and corrections to predict annoyance for this new class of aircraft. A computer synthesis system was used to generate 35 realistic, time-varying simulations of advanced turboprop takeoff noise in which the tonal content was systematically varied to represent combinations of 15 fundamental frequency (blade passage frequency) combinations and three tone-to-broadband noise ratios. The fundamental frequencies, which represented blade number combinations from 6 x 5 to 13 x 12 and 7 x 5 to 13 x 11, ranged from 112.5 to 292.5 Hz. The three tone-to-broadband noise ratios were 0, 15, and 30 dB. These advanced turboprop simulations along with recordings of five conventional turboprop takeoffs and five conventional jet takeoffs were presented at D-weighted sound pressure levels of 70, 80, and 90 dB to 64 subjects in an anechoic chamber. Analyses of the subjects' annoyance judgments compare the three categories of aircraft and examine the effects of the differences in tonal content among the advanced turboprop noises. The annoyance prediction ability of various noise measurement procedures and corrections is also examined. Mccurdy, David A. Langley Research Center RTOP 535-03-11-03...
Book Synopsis Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Comparison of Different Propeller Configurations by : David A. McCurdy
Download or read book Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Comparison of Different Propeller Configurations written by David A. McCurdy and published by . This book was released on 1991 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1987 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Information Output of the Langley Research Center for Calendar Year 1985 by :
Download or read book Scientific and Technical Information Output of the Langley Research Center for Calendar Year 1985 written by and published by . This book was released on 1986 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise by : National Aeronautics and Space Adm Nasa
Download or read book Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-02 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781730782893 Total Pages :78 pages Book Rating :4.7/5 (828 download)
Book Synopsis Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Comparison of Different Propeller Configurations by : National Aeronautics and Space Adm Nasa
Download or read book Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Comparison of Different Propeller Configurations written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-02 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781730842986 Total Pages :92 pages Book Rating :4.8/5 (429 download)
Book Synopsis Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-Rotating-Propeller Configuration by : National Aeronautics and Space Adm Nasa
Download or read book Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-Rotating-Propeller Configuration written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-04 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1986 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aircraft Noise Synthesis System by : David A. McCurdy
Download or read book Aircraft Noise Synthesis System written by David A. McCurdy and published by . This book was released on 1987 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-rotating-propeller Configuration by : David A. MacCurdy
Download or read book Annoyance Caused by Advanced Turboprop Aircraft Flyover Noise: Counter-rotating-propeller Configuration written by David A. MacCurdy and published by . This book was released on 1990 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA SP. written by and published by . This book was released on 1992 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1990 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Book Synopsis Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography by :
Download or read book Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography written by and published by . This book was released on 1987 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :Gerry E. Hendershot Publisher :Department of Health and Human Services Public Health Service National Center for Health Statistics ISBN 13 :9780840602220 Total Pages :982 pages Book Rating :4.6/5 (22 download)
Book Synopsis Use of Services for Family Planning and Infertility, United States by : Gerry E. Hendershot
Download or read book Use of Services for Family Planning and Infertility, United States written by Gerry E. Hendershot and published by Department of Health and Human Services Public Health Service National Center for Health Statistics. This book was released on 1988 with total page 982 pages. Available in PDF, EPUB and Kindle. Book excerpt:
