Scientific and Technical Aerospace Reports PDF Download
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 328
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 328
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Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
ISBN: 9781722155223
Category :
Languages : en
Pages : 44
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Book Description
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...
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 538
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 956
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 954
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
Author:
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ISBN:
Category :
Languages : en
Pages : 96
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Author:
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ISBN:
Category : Government reports announcements & index
Languages : en
Pages : 1832
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Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 352
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Author:
Publisher:
ISBN:
Category : Modal analysis
Languages : en
Pages : 890
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Author:
Publisher:
ISBN:
Category : Shock (Mechanics)
Languages : en
Pages : 600
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Book Description
