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Determining Xv 15 Aeroelastic Modes From Flight Data With Frequency Domain Methods
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722344955 Total Pages :72 pages Book Rating :4.3/5 (449 download)
Book Synopsis Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-Domain Methods by : National Aeronautics and Space Administration (NASA)
Download or read book Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-Domain Methods 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 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The XV-15 tilt-rotor wing has six major aeroelastic modes that are close in frequency. To precisely excite individual modes during flight test, dual flaperon exciters with automatic frequency-sweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier transformed). All spectral data were computed using chirp z-transforms. Modal frequencies and damping were determined by fitting curves to frequency-response magnitude and phase data. The results given in this report are for the XV-15 with its original metal rotor blades. Also, frequency and damping values are compared with theoretical predictions made using two different programs, CAMRAD and ASAP. The frequency-domain data-analysis method proved to be very reliable and adequate for tracking aeroelastic modes during flight-envelope expansion. This approach required less flight-test time and yielded mode estimations that were more repeatable, compared with the exponential-decay method previously used. Acree, C. W., Jr. and Tischler, Mark B. Ames Research Center...
Book Synopsis Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-domain Methods by :
Download or read book Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-domain Methods written by and published by . This book was released on 1993 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Using Frequency-domain Methods to Identify XV-15 Aeroelastic Modes by :
Download or read book Using Frequency-domain Methods to Identify XV-15 Aeroelastic Modes written by and published by . This book was released on 1987 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The XV-15 Tilt-Rotor wing has six major aeroelastic modes that are close in frequency. To precisely excite individual modes during flight test, dual flaperon exciters with automatic frequency-sweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier transformed) with cross-spectral and transfer-function methods. Modal frequencies and damping were determined by performing curve fits to transfer-function magnitude and phase data and to cross-spectral magnitude data. Results are given for the XV-15 with its original metal rotor blades. Frequency and damping values are also compared with earlier predictions. Keywords: Tilt rotor aircraft.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781723490484 Total Pages :26 pages Book Rating :4.4/5 (94 download)
Book Synopsis Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes by : National Aeronautics and Space Administration (NASA)
Download or read book Using Frequency-Domain Methods to Identify XV-15 Aeroelastic Modes written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The XV-15 Tilt-Rotor wing has six major aeroelastic modes that are close in frequency. To precisely excite individual modes during flight test, dual flaperon exciters with automatic frequency-sweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier transformed) with cross spectral and transfer function methods. Modal frequencies and damping were determined by performing curve fits to transfer function magnitude and phase data and to cross spectral magnitude data. Results are given for the XV-15 with its original metal rotor blades. Frequency and damping values are also compared with earlier predictions. Acree, C. W., Jr. and Tischler, Mark B. Ames Research Center NASA-TM-100033, A-87364, NAS 1.15:100033, USAAVSCOM-TR-87-A-17, AD-A194156 RTOP 505-61-51
Book Synopsis Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-domain Methods by : C. W. Acree
Download or read book Determining XV-15 Aeroelastic Modes from Flight Data with Frequency-domain Methods written by C. W. Acree and published by . This book was released on 1993 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of XV-15 Aeroelastic Modes Using Frequency-Domain Methods by :
Download or read book Identification of XV-15 Aeroelastic Modes Using Frequency-Domain Methods written by and published by DIANE Publishing. This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Determining XV-15 Aeroelastic Modes from Flight Data with Freqency-domain Methods by : C.W. Acree (Jr.)
Download or read book Determining XV-15 Aeroelastic Modes from Flight Data with Freqency-domain Methods written by C.W. Acree (Jr.) and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722288570 Total Pages :34 pages Book Rating :4.2/5 (885 download)
Book Synopsis Identification of XV-15 Aeroelastic Modes Using Frequency-Domain Methods by : National Aeronautics and Space Administration (NASA)
Download or read book Identification of XV-15 Aeroelastic Modes Using Frequency-Domain Methods written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-05 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The XV-15 Tilt-Rotor wing has six major aeroelastic modes that are close in frequency. To precisely excite individual modes during flight test, dual flaperon exciters with automatic frequency-sweep controls were installed. The resulting structural data were analyzed in the frequency domain (Fourier transformed) with cross spectral and transfer function methods. Modal frequencies and damping were determined by performing curve fits to transfer function magnitude and phase data and to cross spectral magnitude data. Results are given for the XV-15 with its original metal rotor blades. Frequency and damping values are also compared with earlier predictions. Acree, Cecil W., Jr. and Tischler, Mark B. Ames Research Center RTOP 532-06-00...
Book Synopsis The History of the XV-15 Tilt Rotor Research Aircraft by : Martin D. Maisel
Download or read book The History of the XV-15 Tilt Rotor Research Aircraft written by Martin D. Maisel and published by . This book was released on 2000 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of XV-15 Aeroelastic Modes Using Frequency-domain Methods by : C. W. Acree
Download or read book Identification of XV-15 Aeroelastic Modes Using Frequency-domain Methods written by C. W. Acree and published by . This book was released on 1989 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modeling XV-15 Tilt-rotor Aircraft Dynamics by Frequency and Time-domain Identification Techniques by :
Download or read book Modeling XV-15 Tilt-rotor Aircraft Dynamics by Frequency and Time-domain Identification Techniques written by and published by . This book was released on 1986 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Models of the open-loop hover dynamics of the XV-15 Tilt-Rotor Aircraft are extracted from flight data using two approaches: frequency-domain and time-domain identification. Both approaches are reviewed and the identification results are presented and compared in detail. The extracted models compare favorably, with the differences associated mostly with the inherent weighting of each technique. Step responses are used to show that the predictive capability of the models from both techniques is excellent. Based on the results of this study, the relative strengths and weaknesses of the frequency and time-domain techniques are summarized, and a proposal for a coordinated parameter identification approach is presented. (Author).
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 1994 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalogue, United States Public Documents by :
Download or read book Monthly Catalogue, United States Public Documents written by and published by . This book was released on 1994 with total page 1020 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Technical Reports Awareness Circular : TRAC. by :
Download or read book Technical Reports Awareness Circular : TRAC. written by and published by . This book was released on 1988-08 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Whirl Flutter of Turboprop Aircraft Structures by : Jiří Čečrdle
Download or read book Whirl Flutter of Turboprop Aircraft Structures written by Jiří Čečrdle and published by Elsevier. This book was released on 2023-01-13 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: Whirl Flutter of Turboprop Aircraft Structures, Second Edition explores the whirl flutter phenomenon, including theoretical, practical, analytical and experimental aspects of the matter. Sections provide a general overview regarding aeroelasticity, discussions on the physical principle and the occurrence of whirl flutter in aerospace practice, and experimental research conducted, especially from the 60s. Other chapters delve into analytical methods such as basic and advanced linear models, non-linear and CFD based methods, certification issues including regulation requirements, a description of possible certification approaches, and several examples of aircraft certification from aerospace. Finally, a database of relevant books, reports and papers is provided. This updated and expanded second edition covers new chapters including both analytical and experimental aspects of the subject matter. Provides complex information on turboprop aircraft whirl flutter phenomenon Presents both theoretical and practical (certification related) issues Includes experimental research as well as analytical models (basic and advanced) of matter Includes both early-performed works and recent developments Contains a listing of relevant books and reports
Download or read book Tech Notes written by and published by . This book was released on 1992 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
