Author: National Aeronautics and Space Adm Nasa
Publisher:
ISBN: 9781731261557
Category :
Languages : en
Pages : 122
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Book Description
The design of an actively adaptive dual controller based on an approximation of the stochastic dynamic programming equation for a multi-step horizon is presented. A dual controller that can enhance identification of the system while controlling it at the same time is derived for multi-dimensional problems. This dual controller uses sensitivity functions of the expected future cost with respect to the parameter uncertainties. A passively adaptive cautious controller and the actively adaptive dual controller are examined. In many instances, the cautious controller is seen to turn off while the latter avoids the turn-off of the control and the slow convergence of the parameter estimates, characteristic of the cautious controller. The algorithms have been applied to a multi-variable static model which represents a simplified linear version of the relationship between the vibration output and the higher harmonic control input for a helicopter. Monte Carlo comparisons based on parametric and nonparametric statistical analysis indicate the superiority of the dual controller over the baseline controller. Mookerjee, Purusottam Unspecified Center ADAPTIVE CONTROL; DESIGN ANALYSIS; HARMONIC CONTROL; HELICOPTERS; VIBRATION DAMPING; DIMENSIONS; DYNAMIC PROGRAMMING; ESTIMATES; MONTE CARLO METHOD; PARAMETER IDENTIFICATION; STATIC MODELS; STATISTICAL ANALYSIS; STOCHASTIC PROCESSES...
Author: Nikolai Michailovich Filatov
Publisher: Springer Science & Business Media
ISBN: 9783540213734
Category : Technology & Engineering
Languages : en
Pages : 258
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Book Description
This monograph demonstrates how the performance of various well-known adaptive controllers can be improved significantly using the dual effect. The modifications to incorporate dual control are realized separately and independently of the main adaptive controller without complicating the algorithms. A new bicriterial approach for dual control is developed and applied to various types of popular linear and nonlinear adaptive controllers. Practical applications of the designed controllers to several real-time problems are presented. This monograph is the first book providing a complete exposition on the dual control problem from the inception in the early 1960s to the present state of the art aiming at students and researchers in adaptive control as well as design engineers in industry.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 126
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Book Description
Author:
Publisher:
ISBN:
Category : Technology
Languages : en
Pages : 466
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Book Description
Author:
Publisher:
ISBN:
Category : NASA tech briefs
Languages : en
Pages : 168
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 602
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Graham C Goodwin
Publisher: Courier Corporation
ISBN: 0486137724
Category : Technology & Engineering
Languages : en
Pages : 562
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Book Description
This unified survey focuses on linear discrete-time systems and explores natural extensions to nonlinear systems. It emphasizes discrete-time systems, summarizing theoretical and practical aspects of a large class of adaptive algorithms. 1984 edition.
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1430
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 604
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Book Description
Author: Karl J. Åström
Publisher: Courier Corporation
ISBN: 0486319148
Category : Technology & Engineering
Languages : en
Pages : 596
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Book Description
Suitable for advanced undergraduates and graduate students, this text introduces theoretical and practical aspects of adaptive control. It offers an excellent perspective on techniques as well as an active knowledge of key approaches. Readers will acquire a well-developed sense of when to use adaptive techniques and when other methods are more appropriate. Starting with a broad overview, the text explores real-time estimation, self-tuning regulators and model-reference adaptive systems, stochastic adaptive control, and automatic tuning of regulators. Additional topics include gain scheduling, robust high-gain control and self-oscillating controllers, and suggestions for implementing adaptive controllers. Concluding chapters feature a summary of applications and a brief review of additional areas closely related to adaptive control. Both authors are Professors at the Lund Institute of Technology in Sweden, and this text has evolved from their many years of research and teaching. Their insights into properties, design procedures, and implementation of adaptive controllers are complemented by the numerous examples, simulations, and problems that appear throughout the book.
