Development of an Improved Design Tool for Predicting and Simulating Helicopter Rotor Noise PDF Download
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Author: H. Kevin Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
The rotor noise prediction program has been improved by the following items: (1) inclusion of the helicopter rotor noise ground reflection phenomenon, (2) inclusion of the variability of oscillatory forces as related to the vortex shedding phenomenon, (3) expansion of the data base for the broadband noise data bank, and (4) description of a calculation procedure which demonstrates how the program input deck can be modified to account for impulse signals of single-rotor blade vortex interactions. The rotor noise prediction program has been developed so that the acoustic characteristics of new, untested rotor designs could be evaluated as well as the effects of basic design changes on the acoustic signature of existing rotors. (Modified author abstract).
Author: H. Kevin Johnson
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
The rotor noise prediction program has been improved by the following items: (1) inclusion of the helicopter rotor noise ground reflection phenomenon, (2) inclusion of the variability of oscillatory forces as related to the vortex shedding phenomenon, (3) expansion of the data base for the broadband noise data bank, and (4) description of a calculation procedure which demonstrates how the program input deck can be modified to account for impulse signals of single-rotor blade vortex interactions. The rotor noise prediction program has been developed so that the acoustic characteristics of new, untested rotor designs could be evaluated as well as the effects of basic design changes on the acoustic signature of existing rotors. (Modified author abstract).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 836
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Author:
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ISBN:
Category : Government publications
Languages : en
Pages : 2834
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Author: Wayne Johnson
Publisher: Courier Corporation
ISBN: 9780486682303
Category : Technology & Engineering
Languages : en
Pages : 1126
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Book Description
The history of the helicopter may be traced back to the Chinese flying top (c. 400 BC) and to the work of Leonardo da Vinci, who sketched designs for a vertical flight machine utilizing a screw-type propeller. In the late 19th-century, Thomas Edison experimented with helicopter models, realizing that no such machine would be able to fly until the development of a sufficiently lightweight engine. When the internal combustion gasoline engine came on the scene around 1900, the stage was set for the real development of helicopter technology. While this text provides a concise history of helicopter development, its true purpose is to provide the engineering analysis required to design a highly successful rotorcraft. Toward that end the book offers thorough, comprehensive coverage of the theory of helicopter flight: the elements of vertical flight, forward flight, performance, design, mathematics of rotating systems, rotary wing dynamics and aerodynamics, aeroelasticity, stability and control, stall, noise and more. Wayne Johnson has worked for the U.S. Army and NASA at the Ames Research Center in California. Through his company Johnson Aeronautics, he is engaged in the development of software that is used throughout the world for the analysis of rotorcraft. In this book, Dr. Johnson has compiled a monumental resource that is essential reading for any student or aeronautical engineer interested in the design and development of vertical-flight aircraft.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1408
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 136
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 680
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 548
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Author:
Publisher:
ISBN:
Category : Aerodynamics noise
Languages : en
Pages : 708
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Book Description
