Helicopter Rotor Noise Due To Ingestion Of Atmospheric Turbulence

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Helicopter Rotor Noise Due to Ingestion of Atmospheric Turbulence

Author : John C. Simonich
Publisher :
ISBN 13 :
Total Pages : 156 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Helicopter Rotor Noise Due to Ingestion of Atmospheric Turbulence by : John C. Simonich

Download or read book Helicopter Rotor Noise Due to Ingestion of Atmospheric Turbulence written by John C. Simonich and published by . This book was released on 1986 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical study was conducted to develop an analytical prediction method for helicopter main rotor noise due to the ingestion of atmospheric turbulence. This study incorporates an atmospheric turbulence model, a rotor mean flow contraction model and a rapid distortion turbulence model which together determine the statistics of the non-isotropic turbulence at the rotor plane. Inputs to the combined mean inflow and turbulence models are controlled by atmospheric wind characteristics and helicopter operating conditions. A generalized acoustic source model was used to predict the far field noise generated by the non-isotropic flow incident on the rotor. Absolute levels for acoustic spectra and directivity patterns were calculated for full scale helicopters, without the use of empirical or adjustable constants. Comparisons between isotropic and non-isotropic turbulence at the rotor face demonstrated pronounced differences in acoustic spectra. Turning and contraction of the flow for hover and low speed vertical ascent cases result in a 3 dB increase in the acoustic spectrum energy and a 10 dB increase in tone levels. Compared to trailing edge noise, turbulence ingestion noise is the dominant noise mechanism below approximately 30 rotor harmonics, while above 100 harmonics, trailing edge noise levels exceed turbulence ingestion noise by 25 dB.

Helicopter Rotor Noise Due to Ingestion of Atmospheric Turbulence

Author :
Publisher :
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Helicopter Rotor Noise Due to Ingestion of Atmospheric Turbulence by :

Download or read book Helicopter Rotor Noise Due to Ingestion of Atmospheric Turbulence written by and published by . This book was released on 1986 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Noise of a Model Helicopter Rotor Due to Ingestion of Turbulence

Author : Robert William Paterson
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Noise of a Model Helicopter Rotor Due to Ingestion of Turbulence by : Robert William Paterson

Download or read book Noise of a Model Helicopter Rotor Due to Ingestion of Turbulence written by Robert William Paterson and published by . This book was released on 1979 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Noise of a Model Helicopter Rotor Due to Ingestion of Turbulence

Author : Robert W. Paterson
Publisher :
ISBN 13 :
Total Pages : 136 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Noise of a Model Helicopter Rotor Due to Ingestion of Turbulence by : Robert W. Paterson

Download or read book Noise of a Model Helicopter Rotor Due to Ingestion of Turbulence written by Robert W. Paterson and published by . This book was released on 1979 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Experimental Assessment of Helicopter Rotor Turbulence Ingestion Noise in Hover

Author :
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Experimental Assessment of Helicopter Rotor Turbulence Ingestion Noise in Hover by :

Download or read book Experimental Assessment of Helicopter Rotor Turbulence Ingestion Noise in Hover written by and published by . This book was released on 1989 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Measurements of Atmospheric Turbulence Effects on Tail Rotor Acoustics

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722632342
Total Pages : 82 pages
Book Rating : 4.6/5 (323 download)

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Book Synopsis Measurements of Atmospheric Turbulence Effects on Tail Rotor Acoustics by : National Aeronautics and Space Administration (NASA)

Download or read book Measurements of Atmospheric Turbulence Effects on Tail Rotor Acoustics written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-08 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results from an outdoor hover test of a full-scale Lynx tail rotor are presented. The investigation was designed to further the understanding of the acoustics of an isolated tail rotor hovering out-of-ground effect in atmospheric turbulence, without the effects of the main rotor wake or other helicopter components. Measurements include simultaneous rotor performance, noise, inflow, and far-field atmospheric turbulence. Results with grid-generated inflow turbulence are also presented. The effects of atmospheric turbulence ingestion on rotor noise are quantified. In contradiction to current theories, increasing rotor inflow and rotor thrust were found to increase turbulence ingestion noise. This is the final report of Task 13A--Helicopter Tail Rotor Noise, of the NASA/United Kingdom Defense Research Agency cooperative Aeronautics Research Program. Hagen, Martin J. and Yamauchi, Gloria K. and Signor, David B. and Mosher, Marianne Ames Research Center...

Measurements of Atmospheric Turbulence Effects on Tail Rotor Acoustics

Author :
Publisher :
ISBN 13 :
Total Pages : 86 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Measurements of Atmospheric Turbulence Effects on Tail Rotor Acoustics by :

Download or read book Measurements of Atmospheric Turbulence Effects on Tail Rotor Acoustics written by and published by . This book was released on 1994 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Noise Produced by Turbulent Flow Into a Rotor

Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781722414504
Total Pages : 44 pages
Book Rating : 4.4/5 (145 download)

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Book Synopsis Noise Produced by Turbulent Flow Into a Rotor by : National Aeronautics and Space Administration (NASA)

Download or read book Noise Produced by Turbulent Flow Into a Rotor written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-09 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: A users manual for a computer program for predicting atmospheric turbulence and mean flow and turbulence contraction as part of a noise prediction scheme for nonisotropic turbulence ingestion noise in helicopters is described. Included are descriptions of the various program modules and subroutines, their function, programming structure, and the required input and output variables. This routine is incorporated as one module of NASA's ROTONET helicopter noise prediction program. Simonich, J. C. and Caplin, B. Unspecified Center NAS1-17763; RTOP 505-63-51...

Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Noise Calculation

Author : Roy K. Amiet
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Noise Calculation by : Roy K. Amiet

Download or read book Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Noise Calculation written by Roy K. Amiet and published by . This book was released on 1989 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (3 download)

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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 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Atmospheric Turbulence Prediction and Mean Flow and Turbulence Contraction Prediction

Download Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Atmospheric Turbulence Prediction and Mean Flow and Turbulence Contraction Prediction PDF Online Free

Author :
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Atmospheric Turbulence Prediction and Mean Flow and Turbulence Contraction Prediction by :

Download or read book Noise Produced by Turbulent Flow Into a Rotor: Theory Manual for Atmospheric Turbulence Prediction and Mean Flow and Turbulence Contraction Prediction written by and published by . This book was released on 1989 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

A Study of Rotor Broadband Noise Mechanisms and Helicopter Tail Rotor Noise

Author :
Publisher :
ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis A Study of Rotor Broadband Noise Mechanisms and Helicopter Tail Rotor Noise by :

Download or read book A Study of Rotor Broadband Noise Mechanisms and Helicopter Tail Rotor Noise written by and published by . This book was released on 1990 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Shock and Vibration Digest

Author :
Publisher :
ISBN 13 :
Total Pages : 660 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis The Shock and Vibration Digest by :

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1980 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Aeronautical Engineering

Author :
Publisher :
ISBN 13 :
Total Pages : 580 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Aeronautical Engineering by :

Download or read book Aeronautical Engineering written by and published by . This book was released on 1971 with total page 580 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)

Flight Performance of Fixed and Rotary Wing Aircraft

Author : Antonio Filippone
Publisher : Elsevier
ISBN 13 : 0080461034
Total Pages : 594 pages
Book Rating : 4.0/5 (84 download)

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Book Synopsis Flight Performance of Fixed and Rotary Wing Aircraft by : Antonio Filippone

Download or read book Flight Performance of Fixed and Rotary Wing Aircraft written by Antonio Filippone and published by Elsevier. This book was released on 2006-05-10 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt: Calculation and optimisation of flight performance is required to design or select new aircraft, efficiently operate existing aircraft, and upgrade aircraft. It provides critical data for aircraft certification, accident investigation, fleet management, flight regulations and safety. This book presents an unrivalled range of advanced flight performance models for both transport and military aircraft, including the unconventional ends of the envelopes. Topics covered include the numerical solution of supersonic acceleration, transient roll, optimal climb of propeller aircraft, propeller performance, long-range flight with en-route stop, fuel planning, zero-gravity flight in the atmosphere, VSTOL operations, ski jump from aircraft carrier, optimal flight paths at subsonic and supersonic speed, range-payload analysis of fixed- and rotary wing aircraft, performance of tandem helicopters, lower-bound noise estimation, sonic boom, and more.This book will be a valuable text for undergraduate and post-graduate level students of aerospace engineering. It will also be an essential reference and resource for practicing aircraft engineers, aircraft operations managers and organizations handling air traffic control, flight and flying regulations, standards, safety, environment, and the complex financial aspects of flying aircraft. Unique coverage of fixed and rotary wing aircraft in a unified manner, including optimisation, emissions control and regulation. Ideal for students, aeronautical engineering capstone projects, and for widespread professional reference in the aerospace industry. Comprehensive coverage of computer-based solution of aerospace engineering problems; the critical analysis of performance data; and case studies from real world engineering experience. Supported by end of chapter exercises

Green Aviation

Author : Ramesh Agarwal
Publisher : John Wiley & Sons
ISBN 13 : 1118866436
Total Pages : 536 pages
Book Rating : 4.1/5 (188 download)

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Book Synopsis Green Aviation by : Ramesh Agarwal

Download or read book Green Aviation written by Ramesh Agarwal and published by John Wiley & Sons. This book was released on 2016-09-21 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Green Aviation is the first authoritative overview of both engineering and operational measures to mitigate the environmental impact of aviation. It addresses the current status of measures to reduce the environmental impact of air travel. The chapters cover such items as: Engineering and technology-related subjects (aerodynamics, engines, fuels, structures, etc.), Operations (air traffic management and infrastructure) Policy and regulatory aspects regarding atmospheric and noise pollution. With contributions from leading experts, this volume is intended to be a valuable addition, and useful resource, for aerospace manufacturers and suppliers, governmental and industrial aerospace research establishments, airline and aviation industries, university engineering and science departments, and industry analysts, consultants, and researchers.

Lecture Notes in Rotorcraft Engineering

Author : Antonio Filippone
Publisher : Springer Nature
ISBN 13 : 3031124375
Total Pages : 255 pages
Book Rating : 4.0/5 (311 download)

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Book Synopsis Lecture Notes in Rotorcraft Engineering by : Antonio Filippone

Download or read book Lecture Notes in Rotorcraft Engineering written by Antonio Filippone and published by Springer Nature. This book was released on 2023-01-27 with total page 255 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook is a multi-disciplinary compendium that includes several aspects of rotorcraft technology. It introduces the reader to the aerodynamic aspects of rotary wings and presents experimental techniques for aerodynamics. The chapters also cover rotorcraft engines and rotorcraft steady-state flight performance and stability. It explores several aspects of the tiltrotor configuration and lists challenges in their design, modelling and simulation. The reader will also find an introductory overview of flight control systems for rotorcraft, as well as the conceptual and preliminary design concepts for a conventional helicopter. This textbook contains video recordings of computer simulations that can be used alongside the main text.