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A hybrid controller for stability ro...

Tian, Feng.

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A hybrid controller for stability robustness, performance robustness, and disturbance attenuation of a maglev system.

Record Type:	Electronic resources : Monograph/item
Title/Author:	A hybrid controller for stability robustness, performance robustness, and disturbance attenuation of a maglev system./
Author:	Tian, Feng.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2015,
Description:	268 p.
Notes:	Source: Dissertations Abstracts International, Volume: 77-02, Section: B.
Contained By:	Dissertations Abstracts International77-02B.
Subject:	Mechanical engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3701913
ISBN:	9781321728309

A hybrid controller for stability robustness, performance robustness, and disturbance attenuation of a maglev system.
Tian, Feng.

A hybrid controller for stability robustness, performance robustness, and disturbance attenuation of a maglev system. - Ann Arbor : ProQuest Dissertations & Theses, 2015 - 268 p.

Source: Dissertations Abstracts International, Volume: 77-02, Section: B.

Thesis (Ph.D.)--Marquette University, 2015.

This item must not be added to any third party search indexes.

Devices using magnetic levitation (maglev) offer the potential for friction-free, high-speed, and high-precision operation. Applications include frictionless bearings, high-speed ground transportation systems, wafer distribution systems, high-precision positioning stages, and vibration isolation tables. Maglev systems rely on feedback controllers to maintain stable levitation. Designing such feedback controllers is challenging since mathematically the electromagnetic force is nonlinear and there is no local minimum point on the levitating force function. As a result, maglev systems are open-loop unstable. Additionally, maglev systems experience disturbances and system parameter variations (uncertainties) during operation. A successful controller design for maglev system guarantees stability during levitating despite system nonlinearity, and desirable system performance despite disturbances and system uncertainties. This research investigates five controllers that can achieve stable levitation: PD, PID, lead, model reference control, and LQR/LQG. It proposes an acceleration feedback controller (AFC) design that attenuates disturbance on a maglev system with a PD controller. This research proposes three robust controllers, QFT, Hinf , and QFT/Hinf , followed by a novel AFC-enhanced QFT/Hinf (AQH) controller. The AQH controller allows system robustness and disturbance attenuation to be achieved in one controller design. The controller designs are validated through simulations and experiments. In this research, the disturbances are represented by force disturbances on the levitated object, and the system uncertainties are represented by parameter variations. The experiments are conducted on a 1 DOF maglev testbed, with system performance including stability, disturbance rejection, and robustness being evaluated. Experiments show that the tested controllers can maintain stable levitation. Disturbance attenuation is achieved with the AFC. The robust controllers, QFT, Hinf , QFT/ Hinf, and AQH successfully guarantee system robustness. In addition, AQH controller provides the maglev system with a disturbance attenuation feature. The contributions of this research are the design and implementation of the acceleration feedback controller, the QFT/ Hinf , and the AQH controller. Disturbance attenuation and system robustness are achieved with these controllers. The controllers developed in this research are applicable to similar maglev systems.

ISBN: 9781321728309Subjects--Topical Terms:

649730
Mechanical engineering.
Subjects--Index Terms:

Acceleration feedback

A hybrid controller for stability robustness, performance robustness, and disturbance attenuation of a maglev system.
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100 1 $a Tian, Feng. $3 1036227
245 1 0 $a A hybrid controller for stability robustness, performance robustness, and disturbance attenuation of a maglev system.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2015
300 $a 268 p.
500 $a Source: Dissertations Abstracts International, Volume: 77-02, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Nagurka, Mark.
502 $a Thesis (Ph.D.)--Marquette University, 2015.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Devices using magnetic levitation (maglev) offer the potential for friction-free, high-speed, and high-precision operation. Applications include frictionless bearings, high-speed ground transportation systems, wafer distribution systems, high-precision positioning stages, and vibration isolation tables. Maglev systems rely on feedback controllers to maintain stable levitation. Designing such feedback controllers is challenging since mathematically the electromagnetic force is nonlinear and there is no local minimum point on the levitating force function. As a result, maglev systems are open-loop unstable. Additionally, maglev systems experience disturbances and system parameter variations (uncertainties) during operation. A successful controller design for maglev system guarantees stability during levitating despite system nonlinearity, and desirable system performance despite disturbances and system uncertainties. This research investigates five controllers that can achieve stable levitation: PD, PID, lead, model reference control, and LQR/LQG. It proposes an acceleration feedback controller (AFC) design that attenuates disturbance on a maglev system with a PD controller. This research proposes three robust controllers, QFT, Hinf , and QFT/Hinf , followed by a novel AFC-enhanced QFT/Hinf (AQH) controller. The AQH controller allows system robustness and disturbance attenuation to be achieved in one controller design. The controller designs are validated through simulations and experiments. In this research, the disturbances are represented by force disturbances on the levitated object, and the system uncertainties are represented by parameter variations. The experiments are conducted on a 1 DOF maglev testbed, with system performance including stability, disturbance rejection, and robustness being evaluated. Experiments show that the tested controllers can maintain stable levitation. Disturbance attenuation is achieved with the AFC. The robust controllers, QFT, Hinf , QFT/ Hinf, and AQH successfully guarantee system robustness. In addition, AQH controller provides the maglev system with a disturbance attenuation feature. The contributions of this research are the design and implementation of the acceleration feedback controller, the QFT/ Hinf , and the AQH controller. Disturbance attenuation and system robustness are achieved with these controllers. The controllers developed in this research are applicable to similar maglev systems.
590 $a School code: 0116.
650 4 $a Mechanical engineering. $3 649730
653 $a Acceleration feedback
653 $a H infinity
653 $a Maglev
653 $a Performance robustness
653 $a Qft
653 $a Robust control
690 $a 0548
710 2 $a Marquette University. $b Mechanical Engineering. $3 1671720
773 0 $t Dissertations Abstracts International $g 77-02B.
790 $a 0116
791 $a Ph.D.
792 $a 2015
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3701913