Acoustic Performance Of Novel Fan Noise Reduction

Author : David M. Elliott
Publisher :
ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.30/5 ( download)

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Download or read book Acoustic Performance of Novel Fan Noise Reduction Technologies for a High Bypass Model Turbofan at Simulated Flight Conditions written by David M. Elliott and published by . This book was released on 2010 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781719381772
Total Pages : 24 pages
Book Rating : 4.71/5 ( download)

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Download or read book Acoustic Performance of Novel Fan Noise Reduction Technologies for a High Bypass Model Turbofan at Simulated Flights Conditions written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two novel fan noise reduction technologies, over the rotor acoustic treatment and soft stator vane technologies, were tested in an ultra-high bypass ratio turbofan model in the NASA Glenn Research Center s 9- by 15-Foot Low-Speed Wind Tunnel. The performance of these technologies was compared to that of the baseline fan configuration, which did not have these technologies. Sideline acoustic data and hot film flow data were acquired and are used to determine the effectiveness of the various treatments. The material used for the over the rotor treatment was foam metal and two different types were used. The soft stator vanes had several internal cavities tuned to target certain frequencies. In order to accommodate the cavities it was necessary to use a cut-on stator to demonstrate the soft vane concept. Elliott, David M. and Woodward, Richard P. and Podboy, Gary G. Glenn Research Center ACOUSTIC PROPERTIES; AERODYNAMIC NOISE; TURBOFANS; NOISE REDUCTION; BYPASS RATIO; WIND TUNNELS; FAN BLADES; VANES

Author : National Aeronautics and Space Administration (NASA)
Publisher :
ISBN 13 : 9781466499126
Total Pages : 28 pages
Book Rating : 4.25/5 ( download)

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Download or read book Acoustic Performance of Novel Fan Noise Reduction written by National Aeronautics and Space Administration (NASA) and published by . This book was released on 2010-11-01 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two novel fan noise reduction technologies, over the rotor acoustic treatment and soft stator vane technologies, were tested in an ultra-high bypass ratio turbofan model in the NASA Glenn Research Center's 9- by 15-Foot Low-Speed Wind Tunnel. The performance of these technologies was compared to that of the baseline fan configuration, which did not have these technologies. Sideline acoustic data and hot film flow data were acquired and are used to determine the effectiveness of the various treatments. The material used for the over the rotor treatment was foam metal and two different types were used. The soft stator vanes had several internal cavities tuned to target certain frequencies. In order to accommodate the cavities it was necessary to use a cut-on stator to demonstrate the soft vane concept.

Author : Randall F. Barron
Publisher : CRC Press
ISBN 13 : 9780203910085
Total Pages : 568 pages
Book Rating : 4.87/5 ( download)

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Download or read book Industrial Noise Control and Acoustics written by Randall F. Barron and published by CRC Press. This book was released on 2002-11-14 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiling strategies from more than 30 years of experience, this book provides numerous case studies that illustrate the implementation of noise control applications, as well as solutions to common dilemmas encountered in noise reduction processes. It offers methods for predicting the noise generation level of common systems such as fans, motors, c

Author : Howard L. Wesoky
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.53/5 ( download)

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Download or read book Comparison of the Noise Characteristics of Two Low Pressure Ratio Fans with a High Throat Mach Number Inlet written by Howard L. Wesoky and published by . This book was released on 1978 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Paul R. Soderman
Publisher :
ISBN 13 :
Total Pages : 84 pages
Book Rating : 4.86/5 ( download)

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Download or read book Acoustic performance of two 1.83-meter-diameter fans designed for a wind-tunnel drive system written by Paul R. Soderman and published by . This book was released on 1977 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : John Foreman
Publisher : Springer Science & Business Media
ISBN 13 : 1468466771
Total Pages : 473 pages
Book Rating : 4.75/5 ( download)

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Download or read book Sound Analysis and Noise Control written by John Foreman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has been written to provide an intro Chapter 2 deals with the mechanism of hear duction to the fundamental concepts of sound ing and the subjective rating of sound, includ and a comprehensive coverage whereby un ing age-related and noise-induced hearing loss. wanted sound (noise) can be controlled. Al Assessment of any noise problem involves a though there are many notable textbooks which knowledge of the instrumentation available for deal primarily with the physics (or theory) of measurements, the limitations of this instru sound, and others which treat noise control in mentation, the appropriate procedures for mak a strictly practical (and sometimes even empir ing the measurements with the instrumentation, ical) manner, there are few textbooks that pro and the methods by which the measured data vide a bridging between the necessary under can be analyzed. Chapter 3 provides an up-to standing of the fundamentals of sound (its date coverage of these requirements, including generation, propagation, measurement) and the a section on one of the newest and most valu application of these fundamentals to its control. able tools in noise studies-sound intensity This book provides that link. measurement. The capability of being able to The text presents noise control primarily at measure sound intensity as compared with con the introductory level.

Author : Edward J. Rice
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.24/5 ( download)

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Download or read book Acoustic and Aerodynamic Performance of a 6-foot-diameter Fan for Turbofan Engines written by Edward J. Rice and published by . This book was released on 1971 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Author : Bell
Publisher : CRC Press
ISBN 13 : 9780824790288
Total Pages : 686 pages
Book Rating : 4.86/5 ( download)

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Download or read book Industrial Noise Control written by Bell and published by CRC Press. This book was released on 1993-10-28 with total page 686 pages. Available in PDF, EPUB and Kindle. Book excerpt: Illustrates the latest solutions to real problems occurring in industry, buildings, and communities. Second Edition offers many more 13roblem sets and end-of-chapter exercises as well as up-to-the-minute coverage of new topics.

Author :
Publisher :
ISBN 13 :
Total Pages : 492 pages
Book Rating : 4.5X/5 ( download)

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Download or read book NASA Technical Memorandum written by and published by . This book was released on 1994 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: