Underactuated Mechanical Nonminimum-Phase Systems: Analysis and Control

 
9783639190496: Underactuated Mechanical Nonminimum-Phase Systems: Analysis and Control
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Underactuated mechanical systems have fewer independent actuators than the number of degrees of freedom. This thesis establishes the formal link between nonminimum phase and underactuation and proposes suitable control techniques. Two-link underactuated mechanical systems without friction are shown to be nonminimum phase for those outputs that i) correspond to an arbitrary combination of the coordinates, and ii) are small-time locally controllable. On the control side, the forces present in these systems are separated into two categories, namely the actuator forces (direct effect of the input), and the state-dependent forces (integral effect of the input) such as gravity, Coriolis, centrifugal and possibly aerodynamic forces. The first scheme neglects the direct influence of the input, leading to a minimum-phase, flat approximation. The second strategy does not neglect the nonminimum-phase part but rather transforms it into a delay. These schemes are illustrated on a two-degree-of-freedom helicopter termed the Toycopter. In this system, the aerodynamic force is manipulated by changing the propeller rotation speed while maintaining the angle of attack constant.

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About the Author:

Philippe Mullhaupt received a M. Sc. in Electrical Engineering from the Swiss Federal Insitute of Technology (EPFL) in 1993 and a "Diplôme d'Etudes Approfondies" in Signal Processing and Control from the Unversity of Paris XI in 1994. In 1999 he received his Ph. D. degree. He currently teaches and conducts research in Nonlinear Control.

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Book Description Condition: New. Publisher/Verlag: VDM Verlag Dr. Müller | Analysis and Control | Underactuated mechanical systems have fewer independent actuators than the number of degrees of freedom. This thesis establishes the formal link between nonminimum phase and underactuation and proposes suitable control techniques. Two-link underactuated mechanical systems without friction are shown to be nonminimum phase for those outputs that i) correspond to an arbitrary combination of the coordinates, and ii) are small-time locally controllable. On the control side, the forces present in these systems are separated into two categories, namely the actuator forces (direct effect of the input), and the state-dependent forces (integral effect of the input) such as gravity, Coriolis, centrifugal and possibly aerodynamic forces. The first scheme neglects the direct influence of the input, leading to a minimum-phase, flat approximation. The second strategy does not neglect the nonminimum-phase part but rather transforms it into a delay. These schemes are illustrated on a two-degree-of-freedom helicopter termed the Toycopter. In this system, the aerodynamic force is manipulated by changing the propeller rotation speed while maintaining the angle of attack constant. | Format: Paperback | Language/Sprache: english | 150 gr | 220x150x5 mm | 100 pp. Seller Inventory # K9783639190496

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Book Description VDM Verlag Sep 2009, 2009. Taschenbuch. Condition: Neu. Neuware - Underactuated mechanical systems have fewer independent actuators than the number of degrees of freedom. This thesis establishes the formal link between nonminimum phase and underactuation and proposes suitable control techniques. Two-link underactuated mechanical systems without friction are shown to be nonminimum phase for those outputs that i) correspond to an arbitrary combination of the coordinates, and ii) are small-time locally controllable. On the control side, the forces present in these systems are separated into two categories, namely the actuator forces (direct effect of the input), and the state-dependent forces (integral effect of the input) such as gravity, Coriolis, centrifugal and possibly aerodynamic forces. The first scheme neglects the direct influence of the input, leading to a minimum-phase, flat approximation. The second strategy does not neglect the nonminimum-phase part but rather transforms it into a delay. These schemes are illustrated on a two-degree-of-freedom helicopter termed the Toycopter. In this system, the aerodynamic force is manipulated by changing the propeller rotation speed while maintaining the angle of attack constant. 100 pp. Englisch. Seller Inventory # 9783639190496

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Book Description VDM Verlag Sep 2009, 2009. Taschenbuch. Condition: Neu. Neuware - Underactuated mechanical systems have fewer independent actuators than the number of degrees of freedom. This thesis establishes the formal link between nonminimum phase and underactuation and proposes suitable control techniques. Two-link underactuated mechanical systems without friction are shown to be nonminimum phase for those outputs that i) correspond to an arbitrary combination of the coordinates, and ii) are small-time locally controllable. On the control side, the forces present in these systems are separated into two categories, namely the actuator forces (direct effect of the input), and the state-dependent forces (integral effect of the input) such as gravity, Coriolis, centrifugal and possibly aerodynamic forces. The first scheme neglects the direct influence of the input, leading to a minimum-phase, flat approximation. The second strategy does not neglect the nonminimum-phase part but rather transforms it into a delay. These schemes are illustrated on a two-degree-of-freedom helicopter termed the Toycopter. In this system, the aerodynamic force is manipulated by changing the propeller rotation speed while maintaining the angle of attack constant. 100 pp. Englisch. Seller Inventory # 9783639190496

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Book Description VDM Verlag, 2009. Condition: New. book. Seller Inventory # M3639190491

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