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Author: Dunstan Graham
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
Three problems were chosen so as to explore some of the apparent limitations of describing function technique for the analysis of nonlinear systems, and to show how the technique might be extended so as to overcome the indicated deficiencies. The problems were (a) the effects of stick and valve friction in fully powered, manual aircraft control systems, (b) limit cycles in satellite attitude control with off-on jets, and (c) the effects of aerodynamic hysteresis in the stability derivatives of tilt-wing VTOL aircraft. The results indicate that new describing functions can be developed as closed-loop functions provided that specific restrictions are met, that non-sinusoidal, Fourier series describing functions or a generalized periodic input describing function can be successful, but that they are extraordinarily difficult to apply, and that the aerodynamic nonlinearities which were considered are of small practical importance. (Author).
Author: Dunstan Graham
Publisher:
ISBN:
Category :
Languages : en
Pages : 111
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Book Description
Three problems were chosen so as to explore some of the apparent limitations of describing function technique for the analysis of nonlinear systems, and to show how the technique might be extended so as to overcome the indicated deficiencies. The problems were (a) the effects of stick and valve friction in fully powered, manual aircraft control systems, (b) limit cycles in satellite attitude control with off-on jets, and (c) the effects of aerodynamic hysteresis in the stability derivatives of tilt-wing VTOL aircraft. The results indicate that new describing functions can be developed as closed-loop functions provided that specific restrictions are met, that non-sinusoidal, Fourier series describing functions or a generalized periodic input describing function can be successful, but that they are extraordinarily difficult to apply, and that the aerodynamic nonlinearities which were considered are of small practical importance. (Author).
Author: Thomas Roberts Welch
Publisher:
ISBN:
Category : Functional analysis
Languages : en
Pages : 170
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Author: Dallas George Denery
Publisher:
ISBN:
Category : Flight simulators
Languages : en
Pages : 34
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This paper reviews some of the most common methods of describing function development. The describing function has been used primarily for stability analysis on the Nichols, polar, and Nyquist plots. This paper shows the use of the real and imaginary components of the describing function on the parameter plane. In addition a generalized digital computer program is developed for generating describing function data for a large class of nonlinearities. Data is computed and tabulated for a number of common nonlinearities, and these tables are included as an appendix.
Author: Didier J. Dubois
Publisher: Morgan Kaufmann
ISBN: 1483214508
Category : Computers
Languages : en
Pages : 929
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Book Description
Readings in Fuzzy Sets for Intelligent Systems is a collection of readings that explore the main facets of fuzzy sets and possibility theory and their use in intelligent systems. Basic notions in fuzzy set theory are discussed, along with fuzzy control and approximate reasoning. Uncertainty and informativeness, information processing, and membership, cognition, neural networks, and learning are also considered. Comprised of eight chapters, this book begins with a historical background on fuzzy sets and possibility theory, citing some forerunners who discussed ideas or formal definitions very close to the basic notions introduced by Lotfi Zadeh (1978). The reader is then introduced to fundamental concepts in fuzzy set theory, including symmetric summation and the setting of fuzzy logic; uncertainty and informativeness; and fuzzy control. Subsequent chapters deal with approximate reasoning; information processing; decision and management sciences; and membership, cognition, neural networks, and learning. Numerical methods for fuzzy clustering are described, and adaptive inference in fuzzy knowledge networks is analyzed. This monograph will be of interest to both students and practitioners in the fields of computer science, information science, applied mathematics, and artificial intelligence.
Author: Jerry Michael Loveless
Publisher:
ISBN:
Category :
Languages : en
Pages : 254
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Book Description
This paper reviews some of the most common methods of describing function development. The describing function has been used primarily for stability analysis on the Nichols, polar, and Nyquist plots. This paper shows the use of the real and imaginary components of the describing function on the parameter plane. In addition a generalized digital computer program is developed for generating describing function data for a large class of nonlinearities. Data is computed and tabulated for a number of common nonlinearities, and these tables are included as an appendix.
Author: Ü Jaaksoo
Publisher: Elsevier
ISBN: 1483297462
Category : Technology & Engineering
Languages : en
Pages : 555
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Book Description
This volume provides a general overview on the state-of-the-art and future developments in automation and control. The application of systems and control in all areas is covered, from the social and cultural effects of control, to control in mineral and metal processing. This volume will be an invaluable source of information to all those interested in the areas of automation and control.
Author: United States. Wright Air Development Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1098
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 778
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 984
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