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Book Development and Demonstration of a Flutter suppression System Using Active Controls

Download or read book Development and Demonstration of a Flutter suppression System Using Active Controls written by Maynard C. Sandford and published by . This book was released on 1975 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of active control technology to suppress flutter has been demonstrated successfully in the Langley transonic dynamics tunnel with a delta-wing model. The model was a simplified version of a proposed supersonic transport wing design. An active flutter-suppression method based on an aerodynamic energy criterion has been verified by using three different control laws. The first two control laws utilized both leading-edge and trailing-edge active control surfaces, whereas the third control law required only a single trailing-edge active control surface. At a Mach number of 0.9 the experimental results demonstrated increases in the flutter dynamic pressure from 12.5 percent to 30 percent with active controls. Analytical methods were developed to predict both open-loop and closed-loop stability, and the results agreed reasonably well with the experimental results.

Book NASA Technical Report

Download or read book NASA Technical Report written by and published by . This book was released on 1975 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Masters Theses in the Pure and Applied Sciences

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2013-12-11 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis seminated by the Center for Information and Numerical Data Analysis and Synthesis, (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac tivity was transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 19 (thesis year 1974) a total of 10,045 theses titles from 20 Canadian and 209 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 19 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1124 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book NASA Conference Publication

Download or read book NASA Conference Publication written by and published by . This book was released on 1976 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Shock and Vibration Digest

Download or read book The Shock and Vibration Digest written by and published by . This book was released on 1975 with total page 660 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book NASA Contractor Report

Download or read book NASA Contractor Report written by and published by . This book was released on 1976 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Design and analysis of flutter suppression systems through the use of active controls

Download or read book Design and analysis of flutter suppression systems through the use of active controls written by Radhakrishnamurthy Pinnamaneni and published by . This book was released on 1975 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical study to utilize the recent advances in structural dynamic analysis, unsteady-aerodynamic theories, control theories and optimization techniques in the design and analysis of flutter suppression systems was conducted. At the present time the best formulation of the problem is still open to question, therefore, the formulations that appear most promising for design study applications are presented. One class of formulation presented is more suitable to a parameter optimization design approach in the frequency domain while the second is more suitable to optimal control design techniques. Some of the inherent difficulties associated with casting the problem in the optimal control form are illustrated.

Book Proceedings of the SCAR Conference Part 1

Download or read book Proceedings of the SCAR Conference Part 1 written by and published by . This book was released on 1976 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Design Test and Evaluation of Three Active Flutter Suppression Controllers

Download or read book Design Test and Evaluation of Three Active Flutter Suppression Controllers written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three control law design techniques for flutter suppression are presented. Each technique uses multiple control surfaces and/or sensors. The first method uses traditional tools (such as pole/zero loci and Nyquist diagrams) for producing a controller that has minimal complexity and which is sufficiently robust to handle plant uncertainty. The second procedure uses linear combinations of several accelerometer signals and dynamic compensation to synthesize the model rate of the critical mode for feedback to the distributed control surfaces. The third technique starts with a minimum-energy linear quadratic Gaussian controller, iteratively modifies intensity matrices corresponding to input and output noise, and applies controller order reduction to achieve a low-order, robust controller. The resulting designs were implemented digitally and tested subsonically on the active flexible wing wind-tunnel model in the Langley Transonic Dynamics Tunnel. Only the traditional pole/zero loci design was sufficiently robust to errors in the nominal plant to successfully suppress flutter during the test. The traditional pole/zero loci design provided simultaneous suppression of symmetric and antisymmetric flutter with a 24-percent increase in attainable dynamic pressure. Posttest analyses are shown which illustrate the problems encountered with the other laws. Adams, William M., Jr. and Christhilf, David M. and Waszak, Martin R. and Mukhopadhyay, Vivek and Srinathkumar, S. Langley Research Center RTOP 505-64-20-01...

Book Control Surface Spanwise Placement in Active Flutter Suppression Systems

Download or read book Control Surface Spanwise Placement in Active Flutter Suppression Systems written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-16 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is developed that determines the placement of an active control surface for maximum effectiveness in suppressing flutter. No specific control law is required by this method which is based on the aerodynamic energy concept. It is argued that the spanwise placement of the active controls should coincide with the locations where maximum energy per unit span is fed into the system. The method enables one to determine the distribution, over the different surfaces of the aircraft, of the energy input into the system as a result of the unstable fluttering mode. The method is illustrated using three numerical examples. Nissim, E. and Burken, John J. Armstrong Flight Research Center NASA-TP-2873, H-1492, NAS 1.60:2873 RTOP 505-66-71...

Book Proceedings of the SCAR Supersonic Cruise Aircraft Research Conference Held at Langley Research Center Hampton Virginia November 9 12 1976

Download or read book Proceedings of the SCAR Supersonic Cruise Aircraft Research Conference Held at Langley Research Center Hampton Virginia November 9 12 1976 written by and published by . This book was released on 1977 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: