A Two-degree-of-Freedom Oscillator for Unsteady Aerodynamics Applications PDF Download
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Author: M. s Francis
Publisher:
ISBN:
Category :
Languages : en
Pages : 63
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Book Description
Numerous wind tunnel studies of airfoil dynamic stall have been limited to harmonic model oscillations, but new microcomputers and hybrid servo systems have now been exploited to produce a mechanism which provides a high degree of flexibility in achieving arbitrary model motions in multiple degrees of freedom over a wide range of motion alternatives. A prototype apparatus has been fabricated to provide simultaneous motions of an airfoil or wing model in both pitch and translation. Drive motors provide independent motion in two axes under the control of servo-translator units which respond to pulse trains generated by the microcomputer, using analog position and feedback loops to smooth the pulses. Programs are developed in a higher-level language using a larger disk-based computer system and then the program task image is downline-loaded through a network communications link to the smaller computer. In addition to a thorough description of the experimental apparatus, the various elements of motion control, including servo-translator dynamic characteristics, software techniques for pulse train generation, and required computer interface circuitry are discussed. Measurements of constant rate, constant acceleration, and pure harmonic motions are examined for both drive axes over the entire range of drive parameters. (Author).
Author: M. s Francis
Publisher:
ISBN:
Category :
Languages : en
Pages : 63
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Book Description
Numerous wind tunnel studies of airfoil dynamic stall have been limited to harmonic model oscillations, but new microcomputers and hybrid servo systems have now been exploited to produce a mechanism which provides a high degree of flexibility in achieving arbitrary model motions in multiple degrees of freedom over a wide range of motion alternatives. A prototype apparatus has been fabricated to provide simultaneous motions of an airfoil or wing model in both pitch and translation. Drive motors provide independent motion in two axes under the control of servo-translator units which respond to pulse trains generated by the microcomputer, using analog position and feedback loops to smooth the pulses. Programs are developed in a higher-level language using a larger disk-based computer system and then the program task image is downline-loaded through a network communications link to the smaller computer. In addition to a thorough description of the experimental apparatus, the various elements of motion control, including servo-translator dynamic characteristics, software techniques for pulse train generation, and required computer interface circuitry are discussed. Measurements of constant rate, constant acceleration, and pure harmonic motions are examined for both drive axes over the entire range of drive parameters. (Author).
Author: Michael S. Francis
Publisher:
ISBN:
Category : Aerofoils
Languages : en
Pages : 56
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Book Description
"Numerous wind tunnel studies of airfoil dynamic stall have been limited to harmonic model oscillations, but new microcomputers and hybrid servo systems have now been exploited to produce a mechanism which provides a high degree of flexibility in achieving arbitrary model motions in multiple degrees of freedom over a wide range of motion alternatives. A prototype apparatus has been fabricated to provide simultaneous motions of an airfoil or wing model in both pitch and translation. Drive motors provide independent motion in two axes under the control of servo-translator units which respond to pulse trains generated by the microcomputer, using analog position and feedback loops to smooth the pulses. Programs are developed in a higher-level language using a larger disk-based computer system and then the program task image is downline-loaded through a network communications link to the smaller computer. In addition to a thorough description of the experimental apparatus, the various elements of motion control, including servo-translator dynamic characteristics, software techniques for pulse train generation, and required computer interface circuitry are discussed. Measurements of constant rate, constant acceleration, and pure harmonic motions are examined for both drive axes over the entire range of drive parameters."--Abstract, report documention p.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 440
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Book Description
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 220
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 548
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Book Description
Author: B. W. van Oudheusden
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 132
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Book Description
Author: Velimir Jurdjevic
Publisher: Cambridge University Press
ISBN: 0521495024
Category : Mathematics
Languages : en
Pages : 516
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Book Description
Geometric control theory is concerned with the evolution of systems subject to physical laws but having some degree of freedom through which motion is to be controlled. This book describes the mathematical theory inspired by the irreversible nature of time evolving events. The first part of the book deals with the issue of being able to steer the system from any point of departure to any desired destination. The second part deals with optimal control, the question of finding the best possible course. An overlap with mathematical physics is demonstrated by the Maximum principle, a fundamental principle of optimality arising from geometric control, which is applied to time-evolving systems governed by physics as well as to man-made systems governed by controls. Applications are drawn from geometry, mechanics, and control of dynamical systems. The geometric language in which the results are expressed allows clear visual interpretations and makes the book accessible to physicists and engineers as well as to mathematicians.
Author: Robert M. Bennett
Publisher:
ISBN:
Category : Delta wing airplanes
Languages : en
Pages : 136
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Book Description
Author:
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 720
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Book Description
Author: Manabu Ito
Publisher: Elsevier Publishing Company
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 486
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Book Description
With the increasing slenderness and lightness of civil engineering structures such as tower blocks and bridges, wind effects on them have been attracting considerable interest from researchers and design engineers. Since most structures in civil engineering present bluff forms to the wind, the main emphasis of this collection of papers is on bluff body aerodynamics. The flow effects in this case, in addition to turbulence effects in the atmospheric boundary layer illustrate the unique and complex nature of the problems that can be encountered in this field, as opposed to the classical studies in the aeronautical field that influenced the initial development stages of industrial aerodynamics. Selected papers from the colloquium are presented in this volume. The papers offer a comprehensive presentation of the results of the studies made of wind effects on engineering structures. The latest trends in the field are outlined and the results obtained in the solution of topical problems are described.
