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You searched for +publisher:"North Carolina State University" +contributor:("Dr. Fen Wu, Committee Chair"). Showing records 1 – 3 of 3 total matches.

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North Carolina State University

1. Yildizoglu, Suat Ege. Distributed Parameter-Dependent Control of Non-Uniform Flexible Structures.

Degree: MS, Mechanical Engineering, 2002, North Carolina State University

In this thesis, we consider the distributed parameter-dependent modeling and control of non-uniform flexible structures, which are classified under spatially varying distributed systems. A distributed state space model of a non-uniform flexible cantilever beam is developed, in which the spatial variation of the beam parameters is treated as parametric uncertainty, assuming that the system depends on the spatially varying parameters in linear fractional manner. We are particularly interested in the systems discretized in spatial dimension for practical reasons. Spatial discretization is obtained via the central finite difference scheme. We assume that the displacements at each discretized node are measurable in real time for controller use. Based on the proposed distributed model, sufficient conditions for analysis and synthesis of a distributed output-feedback controller are presented using the induced L2 norm as the performance criterion. The controller synthesis condition is characterized in terms of linear matrix inequalities, which are convex optimization problems and can be solved efficiently using available software. The distributed controller inherits the same structure as the plant, which results in a localized control architecture and a simple implementation. Each local controller unit processes the available local displacement measurement while sharing information with its adjacent units. We present the main advantage of distributed control; its reliability in the case of malfunctioning actuators or sensors, where many other control techniques would probably fail. Advisors/Committee Members: Dr. Fen Wu, Committee Chair (advisor), Dr. Larry Silverberg, Committee Member (advisor), Dr. Paul I. Ro, Committee Member (advisor).

Subjects/Keywords: linear matrix inequalities; distributed control; interconnected model; non-uniform flexible beam

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Yildizoglu, S. E. (2002). Distributed Parameter-Dependent Control of Non-Uniform Flexible Structures. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/2166

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Yildizoglu, Suat Ege. “Distributed Parameter-Dependent Control of Non-Uniform Flexible Structures.” 2002. Thesis, North Carolina State University. Accessed January 24, 2020. http://www.lib.ncsu.edu/resolver/1840.16/2166.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Yildizoglu, Suat Ege. “Distributed Parameter-Dependent Control of Non-Uniform Flexible Structures.” 2002. Web. 24 Jan 2020.

Vancouver:

Yildizoglu SE. Distributed Parameter-Dependent Control of Non-Uniform Flexible Structures. [Internet] [Thesis]. North Carolina State University; 2002. [cited 2020 Jan 24]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2166.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yildizoglu SE. Distributed Parameter-Dependent Control of Non-Uniform Flexible Structures. [Thesis]. North Carolina State University; 2002. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2166

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


North Carolina State University

2. Soto, Marco Antonio. Actuator Saturation Control of LPV Systems and Systems with Rate and Amplitude Saturation.

Degree: MS, Mechanical Engineering, 2003, North Carolina State University

In this thesis, we consider the design of anti-windup compensators for exponentially unstable systems with actuator saturation of amplitude and rate, as well as linear parameter varying systems. A set of synthesis conditions for anti-windup compensators are developed for each of the system types, in which the effects of actuator saturation are modeled as sector-bounded nonlinearities, using traditional linear fractional transformations. The performance criteria are the minimization of the induced L₂ norm from disturbance input to error output, as well as the minimization of controller windup due to actuator saturation. Explicit construction formulae are provided for the direct construction of these anti-windup compensators. An exponentially unstable linearized model of an F8 aircraft is used to validate the results of the control analysis. We present the main advantage of the two-step anti-windup controller design procedure; the ease of implementation and the maintenance of high performance criteria in design. Advisors/Committee Members: Dr. Fuh-Gwo Yuan, Committee Member (advisor), Dr. Fen Wu, Committee Chair (advisor), Dr. Larry Silverberg, Committee Member (advisor).

Subjects/Keywords: LPV; Linear Matrix Inequality; Sector-Bounded Nonlinearity; Robust Control; Gain-Scheduling; Anti-Windup Compensation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Soto, M. A. (2003). Actuator Saturation Control of LPV Systems and Systems with Rate and Amplitude Saturation. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/2630

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Soto, Marco Antonio. “Actuator Saturation Control of LPV Systems and Systems with Rate and Amplitude Saturation.” 2003. Thesis, North Carolina State University. Accessed January 24, 2020. http://www.lib.ncsu.edu/resolver/1840.16/2630.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Soto, Marco Antonio. “Actuator Saturation Control of LPV Systems and Systems with Rate and Amplitude Saturation.” 2003. Web. 24 Jan 2020.

Vancouver:

Soto MA. Actuator Saturation Control of LPV Systems and Systems with Rate and Amplitude Saturation. [Internet] [Thesis]. North Carolina State University; 2003. [cited 2020 Jan 24]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2630.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Soto MA. Actuator Saturation Control of LPV Systems and Systems with Rate and Amplitude Saturation. [Thesis]. North Carolina State University; 2003. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2630

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation


North Carolina State University

3. Lu, Bei. Linear Parameter-Varying Control of an F-16 Aircraft at High Angle of Attack.

Degree: PhD, Mechanical Engineering, 2005, North Carolina State University

To improve the aircraft capability at high angle of attack and expand the flight envelope, advanced linear parameter-varying (LPV) control methodologies are studied in this thesis with particular applications of actuator saturation control and switching control. A standard two-step LPV antiwindup control scheme and a systematic switching LPV control approach are derived, and the advantages of LPV control techniques are demonstrated through nonlinear simulations of an F-16 longitudinal autopilot control system. The aerodynamic surface saturation is one of the major issues of flight control in the high angle of attack region. The incorporated unconventional actuators such as thrust vectoring can provide additional control power, but may have a potentially significant pay-off. The proposed LPV antiwindup control scheme is advantageous from the implementation standpoint because it can be thought of as an augmented control algorithm to the existing control system. Moreover, the synthesis condition for an antiwindup compensator is formulated as a linear matrix inequality (LMI) optimization problem and can be solved efficiently. By treating the input saturation as a sector bounded nonlinearity with a tight sector bound, the synthesized antiwindup compensator can stabilize the open-loop exponentially unstable systems. The LPV antiwindup control scheme is applied to the nonlinear F-16 longitudinal model, and compared with the thrust vectoring control approach. The simulation results show that the LPV antiwindup compensator improves the flight quality, and offers advantages over thrust vectoring in a high angle of attack region. For a thrust vectoring augmented aircraft, the actuator sets may be different at low and high angles of attack. Also due to different control objectives, a single controller may not exist over a wide angle of attack region. The proposed switching LPV control approach based on multiple parameter-dependent Lyapunov functions provides a flexible design method with improved performance. A family of LPV controllers are designed, each suitable for a specific angle of attack region. They are switched according to the trajectory of angle of attack so that the closed-loop system remains stable and its performance is optimized. Two switching logics, hysteresis switching and switching with average dwell time, are examined. The control synthesis conditions for both switching logics are formulated as generally non-convex matrix optimization problems. To make the switching LPV control approach more applicable, two convexified methods are given according to the state of the controller is reset or not at switching time. The thrust vectoring augmented F-16 longitudinal model with different control objectives at low and high angles of attack is used to validate the results of the switching control scheme. Advisors/Committee Members: Dr. Ashok Gopalarathnam, Committee Member (advisor), Dr. Fen Wu, Committee Chair (advisor), Dr. Paul I. Ro, Committee Member (advisor), Dr. Mo-Yuen Chow, Committee Member (advisor).

Subjects/Keywords: Linear parameter-varying control; Actuator saturation; Switching control; Thrust Vectoring; Linear matrix inequality; Flight Control; Antiwindup compensation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lu, B. (2005). Linear Parameter-Varying Control of an F-16 Aircraft at High Angle of Attack. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/3086

Chicago Manual of Style (16th Edition):

Lu, Bei. “Linear Parameter-Varying Control of an F-16 Aircraft at High Angle of Attack.” 2005. Doctoral Dissertation, North Carolina State University. Accessed January 24, 2020. http://www.lib.ncsu.edu/resolver/1840.16/3086.

MLA Handbook (7th Edition):

Lu, Bei. “Linear Parameter-Varying Control of an F-16 Aircraft at High Angle of Attack.” 2005. Web. 24 Jan 2020.

Vancouver:

Lu B. Linear Parameter-Varying Control of an F-16 Aircraft at High Angle of Attack. [Internet] [Doctoral dissertation]. North Carolina State University; 2005. [cited 2020 Jan 24]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/3086.

Council of Science Editors:

Lu B. Linear Parameter-Varying Control of an F-16 Aircraft at High Angle of Attack. [Doctoral Dissertation]. North Carolina State University; 2005. Available from: http://www.lib.ncsu.edu/resolver/1840.16/3086

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