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Author : Carl Richard Knospe
Publisher :
ISBN 13 :
Total Pages : 154 pages
Book Rating : 4.X/5 (4 download)
Download or read book Adaptive control of helicopter vibrations via theimpulse response method written by Carl Richard Knospe and published by . This book was released on 1989 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carl R. Knospe
Publisher :
ISBN 13 :
Total Pages : 666 pages
Book Rating : 4.:/5 (241 download)
Download or read book Adaptive Control of a System with Periodic Dynamics written by Carl R. Knospe and published by . This book was released on 1989 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carl Richard Knospe
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (256 download)
Download or read book Adaptive Control of a System with Periodic Dynamics: Application of an Impulse Response Method to the Helicoptor Vibration Problem written by Carl Richard Knospe and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 704 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 538 pages
Book Rating : 4.3/5 (91 download)
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 590 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA SP. written by and published by . This book was released on 1993 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : John T. Pearson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (827 download)
Download or read book Adaptive Strategies for the Active Control of Helicopter Vibration written by John T. Pearson and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Helicopter fuselage vibrations are of significant levels and produce a unique vibration problem. Reducing the vibration levels increases passenger comfort, reduces crew fatigue, allows higher cruise speeds to be achieved and improves equipment reliability. Vibration Reduction Techniques can be divided into two distinct categories, either passive or active techniques. Active control techniques offer the potential for good vibration reduction performance over significant areas of the fuselage. This study describes strategies for the Active Control of Structural Response. The technique aims to minimise the structural vibration of a helicopter. Accelerometers measure the vibration at several key points on the fuselage. A multivariable control algorithm processes this information and calculates a set of control forces for a set of hydraulic actuators, located at strategic points in the structure. Vibration reductions result from the superposition of the actuator induced vibrations forces with those induced in the fuselage by the rotor. This research presents a number of different active control strategies for the reduction of helicopter fuselage vibration. Two distinct active vibration control approaches are a frequency domain controller and a time domain controller, and the Thesis establishes the advantages and disadvantages of each of the control strategies. The time domain option is based upon direct feedback of vibration through constant gain matrices. The subsequent vibration waveform contains information over a wide spectrum of frequencies and consequently control is possible over a range of frequencies. Alternatively the frequency algorithms are specifically concerned with the control of discrete frequencies, the blade-passing frequency being dominant in the case of a helicopter. This thesis describes a third novel approach to the design of an adaptive controller for the reduction
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ISBN 13 :
Total Pages : 826 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1997 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (317 download)
Download or read book An Investigation of Adaptive Controllers for Helicopter Vibration and the Development of a New Dual Controller written by and published by . This book was released on 1985 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 502 pages
Book Rating : 4.E/5 ( download)
Download or read book Technical Reports Awareness Circular : TRAC. written by and published by . This book was released on 1989-12 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (317 download)
Download or read book Adaptive Inverse Control for Helicopter Vibration Reduction written by and published by . This book was released on 1983 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1608 pages
Book Rating : 4.:/5 (89 download)
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Cornelius T. Leondes
Publisher : CRC Press
ISBN 13 : 9789056996574
Total Pages : 346 pages
Book Rating : 4.9/5 (965 download)
Download or read book Structural Dynamic Systems Computational Techniques and Optimization written by Cornelius T. Leondes and published by CRC Press. This book was released on 1999-03-22 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: Computational techniques for the analysis and design of structural dynamic systems using numerical methods have been the focus of an enormous amount of research for several decades. In general, the numerical methods utilized to solve these problems include two phases: (a) spatial discretization by either the finite element method (FEM) or the finite difference method (FDM), and (b) solution of systems of time dependent second-order ordinary differential equations. In addition, the significantly powerful advances in computer systems capabilities have put on the desks of structural systems designers enormous computing power either by means of increasingly effective computer workstations or else through PCs (personal computers), whose increasing power has succeeded in marginalizing the computational power differences between PCs and workstations in many cases. This volume is a comprehensive treatment of the issues involved in computational techniques in structural dynamic systems.
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ISBN 13 :
Total Pages : 566 pages
Book Rating : 4.:/5 (317 download)
Download or read book Aeronautical Engineering: A Cumulative Index to a Continuing Bibliography (supplement 261) written by and published by . This book was released on 1991 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 584 pages
Book Rating : 4.F/5 ( download)
Download or read book The Shock and Vibration Digest written by and published by . This book was released on 2003 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Magnus Bichlmeier
Publisher : Cuvillier Verlag
ISBN 13 : 373698281X
Total Pages : 248 pages
Book Rating : 4.7/5 (369 download)
Download or read book Certifiable L1 Adaptive Control for Helicopters written by Magnus Bichlmeier and published by Cuvillier Verlag. This book was released on 2016-06-27 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Hubschraubern kommen mitunter aufwändige regelungstechnische Verfahren zum Einsatz, um ein intuitiv steuerbares und stabiles Verhalten der Maschine zu erzeugen. Klassische Ansätze in der Entwicklung setzen dabei auf Iterationen aus Systemidentifikation und Auslegung des Systems im Frequenzbereich. In diesem Buch wird vor dem Hintergrund der nur zu gerne unterschätzten Problematik der begrenzten Bandbreiten eine robuste adaptive Regelung eingeführt. Dazu wird ein hochfrequent-aktualisierender L1-adaptiver Regler entsprechend angepasst, ein neues adaptives Gesetz der Ausgangsrückführung eingeführt, eine neue Strategie zur Auslegung der Zustandsrückführung vorgestellt, und für den sicherheitskritischen Aspekt Effekte von Ungenauigkeiten im Rechentakt und von Sensorrauschen evaluiert. Während klassische Ansätze durch nichtlineare Optimierung weitestgehend automatisierbar sind und dennoch die Notwendigkeit wiederholter Flugtests nicht verhindern können, ist der L1-adaptive Regler bei entsprechendem Systemverständnis besonders geeignet, Entwicklungszeiten zu verkürzen. Strenge mathematische Beweise untermauern die Stabilität und Robustheit der eingeführten Algorithmen, wobei die Flugeigenschaften in einem Forschungssimulator verifiziert werden. Often, very complex controller techniques are applied to helicopters for generating an intuitively controllable and stable behavior of the aircraft. In legacy controllers, a number of iterations of system identification and loop shaping methods in frequency domain have to be conducted. In this book, a robust adaptive control theory is introduced, with the often underestimated fact of only limited available bandwidths in mind. To this end, the high-frequency adapting L1-adaptive controller is adjusted, a new adaptive law for output feedback is introduced, a new strategy for defining the design of a state feedback controller is proposed, and effects of uncertainties in the processor clock rate and of sensor noise are evaluated for taking the safety critical nature of the system into account. While legacy approaches can be automated by nonlinear optimization techniques and yet cannot eliminate the necessity of repeated flight tests, the L1-adaptive controller is particularly suitable to reduce development time, provided a sufficiently deep understanding of the system is available. Rigorous mathematical proofs substantiate the stability and robustness of the algorithms as shown, while performance and handling qualities are verified in a research simulator.
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ISBN 13 :
Total Pages : 1318 pages
Book Rating : 4.E/5 ( download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996-03 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
