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An Assessment Of Propeller Aircraft Noise Reduction Technology
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722935030 Total Pages :124 pages Book Rating :4.9/5 (35 download)
Book Synopsis An Assessment of Propeller Aircraft Noise Reduction Technology by : National Aeronautics and Space Administration (NASA)
Download or read book An Assessment of Propeller Aircraft Noise Reduction Technology written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-17 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report is a review of the literature regarding propeller airplane far-field noise reduction. Near-field and cabin noise reduction are not specifically addressed. However, some of the approaches used to reduce far-field noise produce beneficial effects in the near-field and in the cabin. The emphasis is on propeller noise reduction but engine exhaust noise reduction by muffling is also addressed since the engine noise becomes a significant part of the aircraft noise signature when propeller noise is reduced. It is concluded that there is a substantial body of information available that can be used as the basis to reduce propeller airplane noise. The reason that this information is not often used in airplane design is the associated weight, cost, and performance penalties. It is recommended that the highest priority be given to research for reducing the penalties associated with lower operating RPM and propeller diameter while increasing the number of blades. Research to reduce engine noise and explore innovative propeller concepts is also recommended. Metzger, F. Bruce Unspecified Center AIRCRAFT DESIGN; AIRCRAFT ENGINES; AIRCRAFT NOISE; ENGINE NOISE; FAR FIELDS; NOISE REDUCTION; PROPELLER NOISE; PROPELLERS; AIRCRAFT COMPARTMENTS; ASSESSMENTS; COSTS; MUFFLERS; NEAR FIELDS; ROTOR SPEED; WEIGHT REDUCTION...
Book Synopsis An Assessment of Propeller Aircraft Noise Reduction Technology by :
Download or read book An Assessment of Propeller Aircraft Noise Reduction Technology written by and published by . This book was released on 1995 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Noise Control Technology and Alternative Noise Certification Procedures for Propeller-driven Small Airplanes by : David Brown
Download or read book Evaluation of Noise Control Technology and Alternative Noise Certification Procedures for Propeller-driven Small Airplanes written by David Brown and published by . This book was released on 1982 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Noise Control Technology and Alternative Noise Certification Procedures for Propeller-Driven Small Airplanes by : David Brown
Download or read book Evaluation of Noise Control Technology and Alternative Noise Certification Procedures for Propeller-Driven Small Airplanes written by David Brown and published by . This book was released on 1982 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report considers the effectiveness of current noise regulations in Appendix F of FAR Part 36, examines the potential effectiveness of future technology to achieve further noise reduction, and evaluates a number of new concepts for noise certification procedures for propeller-driven small aircraft. The latter were based, in part, on results of a flight test program carried out with Cessna Aircraft Company, to evaluate the utility of takeoff noise tests and the possible use of sound exposure level as a suitable metric for noise certification of the subject aircraft. The study indicates that existing regulations have been effective in stimulating development of quieter propellers for the existing fleet of propeller-driven small aircraft. However, it does not appear economically feasible to achieve more noise reduction in most of this fleet using existing technology with the possible exceptions of some of the two-engine aircraft. However, application of future noise reduction technology, primarily for quieter propellers, should allow a reduction in current noise limits by about 6 dB and should reduce levels of the noisiest aircraft in the current fleet by as much as 10 dB. A takeoff test is appropriate for all propeller aircraft except those equipped with cruise-optimized fixed-pitch propellers. For this test, the current level flyover test appears to represent the noisiest operating condition.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720664406 Total Pages :38 pages Book Rating :4.6/5 (644 download)
Book Synopsis Potential Subjective Effectiveness of Active Interior Noise Control in Propeller Airplanes by : National Aeronautics and Space Administration (NASA)
Download or read book Potential Subjective Effectiveness of Active Interior Noise Control in Propeller Airplanes written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active noise control technology offers the potential for weight-efficient aircraft interior noise reduction, particularly for propeller aircraft. However, there is little information on how passengers respond to this type of interior noise control. This paper presents results of two experiments that use sound quality engineering practices to determine the subjective effectiveness of hypothetical active noise control (ANC) systems in a range of propeller aircraft. The two experiments differed by the type of judgments made by the subjects: pair comparisons based on preference in the first and numerical category scaling of noisiness in the second. Although the results of the two experiments were in general agreement that the hypothetical active control measures improved the interior noise environments, the pair comparison method appears to be more sensitive to subtle changes in the characteristics of the sounds which are related to passenger preference. The reductions in subjective response due to the ANC conditions were predicted with reasonable accuracy by reductions in measured loudness level. Inclusion of corrections for the sound quality characteristics of tonality and fluctuation strength in multiple regression models improved the prediction of the ANC effects.Powell, Clemans A. and Sullivan, Brenda M.Langley Research CenterEFFECTIVENESS; ACTIVE CONTROL; SENSITIVITY; PROPELLER NOISE; NOISE REDUCTION; AIRCRAFT NOISE; PROPELLERS; PROCEDURES; PASSENGERS; LOUDNESS; JUDGMENTS; CORRECTION; AIRCRAFT COMPARTMENTS; SOUND TRANSDUCERS
Book Synopsis Potential Subjective Effectiveness of Active Interior Noise Control in Propeller Airplanes by : Clemans A. Powell
Download or read book Potential Subjective Effectiveness of Active Interior Noise Control in Propeller Airplanes written by Clemans A. Powell and published by . This book was released on 2000 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active noise control technology offers the potential for weight-efficient interior noise reduction, particularly for propeller aircraft. However, there is little information on how passengers respond to this type of interior noise control. This paper presents results of two experiments that use sound quality engineering practices to determine the subjective effectiveness of hypothetical active noise control (ANC) systems in a range of propeller aircraft. The two experiments differed by the type of judgments made by the subjects: pair comparisons based on preference in the first and numerical category scaling of noisiness in the second. Although the results of the two experiments were in general agreement that the hypothetical active control measures improved the interior noise environments, the pair comparison method appears to be more sensitive to subtle changes in the characteristics of the sounds which are related to passenger preference. The reductions in subjective response due to the ANC conditions were predicted with reasonable accuracy by reductions in measured loudness level. Inclusion of corrections for the sound quality characteristics of tonality and fluctuation strength in multiple regression models improved the prediction of the ANC effects.
Book Synopsis Reduction of Propeller Noise by Active Noise Control by : Oskar Bschorr
Download or read book Reduction of Propeller Noise by Active Noise Control written by Oskar Bschorr and published by . This book was released on 1991 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Active noise control, a method of cancelling noise by means of interference with a secondary anti-noise source, is now in full development. The first commercial application of this technique is in the case of active electronically controlled head sets. The next step will be the active noise cancellation in air ducts and in passenger cabins. The aim of this paper is to assess the possibilities of the anti-noise technique for reducing propeller noise. First, by a mathematical simulation the theoretical noise reduction on the ground was calculated and found to be promising for further investigations. In the case of the periodic engine and propeller noise, for example, with only a single anti-noise source the noise foot prints of the lower propeller harmonics can be reduced by up to 10 dB. In laboratory tests the theoretical values will be confirmed experimentally. For cancellation of the periodic noise one can use synchronous anti-noise generators. Compared with the engine and propeller noise the reduction of jet noise by the anti-noise technique is much more difficult. Therefore a sensor and controlling units are necessary because of the stochastic nature of jet noise. Since aircraft noise is a severe problem all methods are to be considered.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721148158 Total Pages :112 pages Book Rating :4.1/5 (481 download)
Book Synopsis Evaluation of the Advanced Subsonic Technology Program Noise Reduction Benefits by : National Aeronautics and Space Administration (NASA)
Download or read book Evaluation of the Advanced Subsonic Technology Program Noise Reduction Benefits written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a detailed evaluation of the aircraft noise reduction technology concepts developed during the course of the NASA/FAA Advanced Subsonic Technology (AST) Noise Reduction Program. In 1992, NASA and the FAA initiated a cosponsored, multi-year program with the U.S. aircraft industry focused on achieving significant advances in aircraft noise reduction. The program achieved success through a systematic development and validation of noise reduction technology. Using the NASA Aircraft Noise Prediction Program, the noise reduction benefit of the technologies that reached a NASA technology readiness level of 5 or 6 were applied to each of four classes of aircraft which included a large four engine aircraft, a large twin engine aircraft, a small twin engine aircraft and a business jet. Total aircraft noise reductions resulting from the implementation of the appropriate technologies for each class of aircraft are presented and compared to the AST program goals. Golub, Robert A. and Rawls, John W., Jr. and Russell, James W. Langley Research Center 23-781-20-12
Book Synopsis Federal Aircraft Noise Abatement Plan by :
Download or read book Federal Aircraft Noise Abatement Plan written by and published by . This book was released on 1971 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aircraft Noise by : Oleksandr Zaporozhets
Download or read book Aircraft Noise written by Oleksandr Zaporozhets and published by CRC Press. This book was released on 2011-05-13 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aircraft noise has adverse impacts on passengers, airport staff and people living near airports, it thus limits the capacity of regional and international airports throughout the world. Reducing perceived noise of aircraft involves reduction of noise at source, along the propagation path and at the receiver. Effective noise control demands highly s
Book Synopsis Aeroacoustics of Flight Vehicles by : Harvey H. Hubbard
Download or read book Aeroacoustics of Flight Vehicles written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Science and Technology. Subcommittee on Transportation, Aviation, and Materials Publisher : ISBN 13 : Total Pages :148 pages Book Rating :4.0/5 ( download)
Book Synopsis Noise Reduction Technology by : United States. Congress. House. Committee on Science and Technology. Subcommittee on Transportation, Aviation, and Materials
Download or read book Noise Reduction Technology written by United States. Congress. House. Committee on Science and Technology. Subcommittee on Transportation, Aviation, and Materials and published by . This book was released on 1985 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Transportation, Aviation, and Materials Publisher : ISBN 13 : Total Pages :164 pages Book Rating :4.0/5 ( download)
Book Synopsis Technology for Aircraft Noise Reduction by : United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Transportation, Aviation, and Materials
Download or read book Technology for Aircraft Noise Reduction written by United States. Congress. House. Committee on Science, Space, and Technology. Subcommittee on Transportation, Aviation, and Materials and published by . This book was released on 1991 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Sources, Control, and Effects of Noise from Aircraft Propellers and Rotors by : John S. Mixson
Download or read book Sources, Control, and Effects of Noise from Aircraft Propellers and Rotors written by John S. Mixson and published by . This book was released on 1981 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Propeller Performance and Noise by :
Download or read book Propeller Performance and Noise written by and published by . This book was released on 1982 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Noise Abatement Technology Options for Conventional Turboprop Airplanes by : William J. Galloway
Download or read book Noise Abatement Technology Options for Conventional Turboprop Airplanes written by William J. Galloway and published by . This book was released on 1981 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Federal Aircraft Noise Abatement Plan by : United States. Office of Noise Abatement
Download or read book Federal Aircraft Noise Abatement Plan written by United States. Office of Noise Abatement and published by . This book was released on 1970 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
