A Preliminary Acoustic Investigation Of A Coaxial Helicopter In High Speed Flight
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A Preliminary Acoustic Investigation Of A Coaxial Helicopter In High Speed Flight
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Author : Gregory Walsh
language : en
Publisher:
Release Date : 2016
A Preliminary Acoustic Investigation Of A Coaxial Helicopter In High Speed Flight written by Gregory Walsh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The desire for a vertical takeoff and landing (VTOL) aircraft capable of high forward flight speeds is very strong. Compound lift-offset coaxial helicopter designs have been proposed and have demonstrated the ability to fulfill this desire. However, with high forward speeds, noise is an important concern that has yet to be thoroughly addressed with this rotorcraft configuration. This work utilizes a coupling between the Rotorcraft Comprehensive Analysis System (RCAS) and PSU-WOPWOP, to computationally explore the acoustics of a lift-offset coaxial rotor system. Specifically, unique characteristics of lift-offset coaxial rotor system noise are identified, and design features and trim settings specific to a compound lift-offset coaxial helicopter are considered for noise reduction. At some observer locations, there is constructive interference of the coaxial acoustic pressure pulses, such that the two signals add completely. The locations of these constructive interferences can be altered by modifying the upper-lower rotor blade phasing, providing an overall acoustic benefit. Significant noise reduction (and power reduction) is possible by reducing rotor tip speeds $-$ an option available because the coaxial rotor in a compound configuration does not need to provide all the propulsive force. Alternative blade designs and blade configurations also enable noise reduction at an in-plane, forward, target observer. This research is a preliminary investigation into compound lift-offset coaxial helicopter noise with the intention of future research spawning from it.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Aeroacoustics Of Flight Vehicles
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Author : Harvey H. Hubbard
language : en
Publisher:
Release Date : 1991
Aeroacoustics Of Flight Vehicles written by Harvey H. Hubbard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aerodynamic noise categories.
Applied Mechanics Reviews
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Author :
language : en
Publisher:
Release Date : 1952
Applied Mechanics Reviews written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1952 with Mechanics, Applied categories.
Aeronautical Engineering A Cumulative Index To A Continuing Bibliography Supplement 261
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Author :
language : en
Publisher:
Release Date : 1991
Aeronautical Engineering A Cumulative Index To A Continuing Bibliography Supplement 261 written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
International Aerospace Abstracts
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Author :
language : en
Publisher:
Release Date : 1999
International Aerospace Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Aeronautics categories.
Government Reports Annual Index
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Author :
language : en
Publisher:
Release Date : 1978
Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Research categories.
Sections 1-2. Keyword Index.--Section 3. Personal author index.--Section 4. Corporate author index.-- Section 5. Contract/grant number index, NTIS order/report number index 1-E.--Section 6. NTIS order/report number index F-Z.
Nasa Sp
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Author :
language : en
Publisher:
Release Date : 1988
Nasa Sp written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Aeronautics categories.
Aeronautical Engineering
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Author :
language : en
Publisher:
Release Date : 1991
Aeronautical Engineering written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Aeronautics categories.
Aeronautical Engineering A Cumulative Index To The 1984 Issues Of The Continuing Bibliography
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Author :
language : en
Publisher:
Release Date : 1985
Aeronautical Engineering A Cumulative Index To The 1984 Issues Of The Continuing Bibliography written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.