File:Identification of random loads impinging on the RAH-66 Comanche Helicopter empennage using spectral analysis (IA identificationof00maso).pdf

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Summary[edit]

Identification of random loads impinging on the RAH-66 Comanche Helicopter empennage using spectral analysis   (Wikidata search (Cirrus search) Wikidata query (SPARQL)  Create new Wikidata item based on this file)
Author
Mason, Patrick H.
image of artwork listed in title parameter on this page
Title
Identification of random loads impinging on the RAH-66 Comanche Helicopter empennage using spectral analysis
Publisher
Monterey, California: Naval Postgraduate School;Springfield, Va.: Available from National Technical Information Service
Description
Thesis advisor(s): E. Roberts Wood, Donald A. Danielson, Joshua H. Gordis
"June 1998."
Thesis (M.S. in Aeronautical Engineering) Naval Postgraduate School, June 1998
Includes bibliographical references (p. 143-144)
The Army RAH-66 ComancheHelicopter is currently undergoing developmental flight testing. Theempennage of the aircraft isexperiencing buffeting where the horizontal and vertical tail vibrate at resonant frequencies. These high buffet loads are manifested in higher than anticipated fitting loads, particularly on the tail, and vibrations in the crew stations and at the nose cone where the targeting sensors are located. Significant effort has been devoted to identifying the sources of excitation and the nature of the structural response. This thesis determines the location andmagnitude of empennage vibratory airloads. Because the nature of the excitation is a random function, spectral analysis is used. To obtain the loads, a three step process was utilized. First, from aircraft differential pressure transducers and accelerometers, the spectral content of theresponse and excitation was determined. Then, using aNASTRAN model modified to replicate the flight test aircraft, frequency response functions were determined between selected points on the aircraft's tail and the accelerometers. Finally, using this information, a solution was obtained for the vibratory airloads. Having provided information on the nature of the driving forces, structural modifications can be made that move the natural frequencies away from thefrequencies of the applied airloads
Mode of access: World Wide Web
System requirements: Adobe Acrobat reader
US Army (USA) author
dk/dk cc:9116 09/30/98

Subjects:
Language English
Publication date 1 June 1998
publication_date QS:P577,+1998-06-01T00:00:00Z/11
Current location
IA Collections: navalpostgraduateschoollibrary; fedlink; americana
Accession number
identificationof00maso
Authority file  OCLC: 1046512364
Source
Internet Archive identifier: identificationof00maso
https://archive.org/download/identificationof00maso/identificationof00maso.pdf

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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