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Book Overview of Recent Flight Flutter Testing Research at NASA Dryden

Download or read book Overview of Recent Flight Flutter Testing Research at NASA Dryden written by Martin J. Brenner and published by . This book was released on 1997 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Overview of Recent Flight Flutter Testing Research at NASA Dryden

Download or read book Overview of Recent Flight Flutter Testing Research at NASA Dryden written by Martin J. Brenner and published by . This book was released on 1997 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Historical Overview of Flight Flutter Testing

Download or read book A Historical Overview of Flight Flutter Testing written by Michael W. Kehoe and published by . This book was released on 1995 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Flutter Testing Techniques

Download or read book Flutter Testing Techniques written by and published by . This book was released on 1976 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Flutter Testing Techniques

Download or read book Flutter Testing Techniques written by and published by . This book was released on 1976 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book In Flight Investigation of a Rotating Cylinder Based Structural Excitation System for Flutter Testing

Download or read book In Flight Investigation of a Rotating Cylinder Based Structural Excitation System for Flutter Testing written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-10-22 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: A research excitation system was test flown at the NASA Dryden Flight Research Facility on the two-seat F-16XL aircraft. The excitation system is a wingtip-mounted vane with a rotating slotted cylinder at the trailing edge. As the cylinder rotates during flight, the flow is alternately deflected upward and downward through the slot, resulting in a periodic lift force at twice the cylinder's rotational frequency. Flight testing was conducted to determine the excitation system's effectiveness in the subsonic, transonic, and supersonic flight regimes. Primary research objectives were to determine the system's ability to develop adequate force levels to excite the aircraft's structure and to determine the frequency range over which the system could excite structural modes of the aircraft. In addition, studies were conducted to determine optimal excitation parameters, such as sweep duration, sweep type, and energy levels. The results from the exciter were compared with results from atmospheric turbulence excitation at the same flight conditions. The comparison indicated that the vane with a rotating slotted cylinder provides superior results. The results from the forced excitation were of higher quality and had less variation than the results from atmospheric turbulence. The forced excitation data also invariably yielded higher structural damping values than those from the atmospheric turbulence data. Vernon, Lura Armstrong Flight Research Center RTOP 505-63-50...

Book A Presentation on Robust Flutter Margin Analysis and a Flutterometer

Download or read book A Presentation on Robust Flutter Margin Analysis and a Flutterometer written by Rick C. Lind and published by . This book was released on 1997 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Real Time Flutter Analysis of an Active Flutter Suppression System on a Remotely Piloted Research Aircraft

Download or read book Real Time Flutter Analysis of an Active Flutter Suppression System on a Remotely Piloted Research Aircraft written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-20 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flight flutter-test results of the first aeroelastic research wing (ARW-1) of NASA's drones for aerodynamic and structural testing program are presented. The flight-test operation and the implementation of the active flutter-suppression system are described as well as the software techniques used to obtain real-time damping estimates and the actual flutter testing procedure. Real-time analysis of fast-frequency aileron excitation sweeps provided reliable damping estimates. The open-loop flutter boundary was well defined at two altitudes; a maximum Mach number of 0.91 was obtained. Both open-loop and closed-loop data were of exceptionally high quality. Although the flutter-suppression system provided augmented damping at speeds below the flutter boundary, an error in the implementation of the system resulted in the system being less stable than predicted. The vehicle encountered system-on flutter shortly after crossing the open-loop flutter boundary on the third flight and was lost. The aircraft was rebuilt. Changes made in real-time test techniques are included. Gilyard, G. B. and Edwards, J. W. Armstrong Flight Research Center; Langley Research Center NASA-TM-84901, NAS 1.15:84901 RTOP 505-33-41

Book Aircraft Ground Vibration Testing at NASA Ames Dryden Flight Research Facility

Download or read book Aircraft Ground Vibration Testing at NASA Ames Dryden Flight Research Facility written by and published by . This book was released on 1987 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Innovation in Flight

Download or read book Innovation in Flight written by Joseph R. Chambers and published by . This book was released on 2005 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: