Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"State feedback control"”.
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State feedback control with time delay
… with an introduction to the theory of vibration control. We broadly classify the control methods into passive and active schemes. We introduce the problem of state feedback control and provide the classical solution in the form of Ackermann formula. We then identify the limitations of the …
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Adaptive State Feedback Control of Lorenz Systems to Its Non-Trivial Equilibrium
… In this chaotic regime, we implement a linear state feedback controller to stabilize the state trajectory at its original nontrivial equilibrium. The state variable for feedback is easily measurable. The system is proved to be globally asymptotically stable with a optimal feedback gain. The …
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State Feedback Control of a Single-Loop Thermosyphon System Via a Quotient Controller
… objective of this work is to design a quotient controller to stabilize a chaotic flow in a single loop thermosyphon system with a high heat index. The thermosyphon loop is heated from below and cooled from above, which causes time-dependent chaotic flow when the external heat index is above a …
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Fractional Order State Feedback Control for Improved Lateral Stability of Semi-Autonomous Commercial Heavy Vehicles
… commercial heavy vehicles, the lateral stability control of articulated vehicles have caught the attention of researchers recently. Active vehicle front steering (AFS) can enhance the handling performance and stability of articulated vehicles for an emergency highway maneuver scenario. However, …
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Holographic sensing for control of flexible structures
A state feedback control system for flexible structures implemented using a holographic sensor and optical processor is presented. Real-time holography provides a mechanism for sensing the distributed shape of a broad class of one and two-dimensional flexible structures in a form that can be …
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Robust Control and Motion Planning for Nonlinear Underactuated Systems Using H -Infinity Techniques
… new techniques for planning and robustly controlling the motion of nonlinear underactuated vehicles when disturbances are present and only imperfect state measurements are available for feedback. The basic motion planning algorithm uses cubic splines or Pythagorean hodograph curves to …
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Stochastic Model Predictive Control via Fixed Structure Policies
<p>In this work, the model predictive control problem is extended to include not only open-loop control sequences but also state-feedback control laws by directly optimizing parameters of a control policy. Additionally, continuous cost functions are developed to allow training of the control policy …
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L1 adaptive control with quantization and delay
This dissertation involves L1 adaptive control development and analysis in the presence of quantization and system delays, addressing quantized uncertain systems and delayed uncertain systems. We discuss three cases of control of quantized systems: the state feedback control for systems with input …
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Dynamics and control of a spatial truss actuator
The use of active control actuators integral to a structure's construction has been suggested in large space structure technology. A 3-D active truss is presented and analyzed and control of the actuators to reduce the vibration of a flexible rod attached to the structure is discussed. A state …
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Fast half-loop maneuvers for the F/A-18 fighter aircraft using a singular perturbation feedback control law
… purpose of this study is to develop a nonlinear feedback control law for the F / A-I8 fighter aircraft that performs a fast half-loop maneuver. This feedback law is developed using a singular perturbation approach. A secondary purpose of this study is to establish a baseline for time optimal …
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Optimal state estimation for the optimal control of far-field acoustic radiation pressure from submerged plates
… hull, is usually undesirable. An optimal control methodology for the suppression of far-field acoustic radiation pressure from submerged structures has been developed by Meirovitch (ref. 1). The linear modal state feedback control law developed implies that the full state (displacements …
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Robust Control of Stochastic Nonlinear Systems
… class of stochastic nonlinear systems in strict-feedback form, where in addition to the standard Wiener process there is a norm-bounded unknown disturbance driving the system. The bound on the disturbance is a stochastic integral quadratic constraint, and it is also related to the constraint on …
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Study of Active Vibration Control using the Method of Receptances
… rod of variable cross section by sensing the state at _x0002_ points along the rod. Using the sensor data, closed loop feedback control gains can be calculated by solving a simple set of linear equations. The feedback gains can be applied to generate the required control force using an …
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Advanced sensing techniques for active structural acoustic control
… structures for active structural acoustic control (ASAC). Test structures studied in this work included a baffled simply supported beam and a baffled simply supported plate which were subjected to a harmonic input disturbance created physically with a shaker and modelled by a point force …
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Nonlinear Dynamics Analysis and Control of Space Vehicles with Flexible Structures
… the system dynamics for stability analysis and control design. The system model is represented by a flexible appendage attached to a central rigid body, where the flexible appendage is modeled as a cantilevered Euler-Bernoulli beam. Discretization techniques, such as the assumed modes method and …
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A proposed methodology for the control of a semi-robotic convoy
… purpose of this thesis is to develop a generic control law for unmanned-trail vehicles as they follow a manned lead vehicle. The development of this semi-robotic convoy control law begins with a model of an individual vehicle. Two methods are then explored of coupling these into a model of the …
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Optimal control, self-tuning techniques and their application to dynamically positioned vessels
… The development of a self-adaptive stochastic control system for dynamically positioned vessels is described in Part One. Part Two is the investigation and the development of self-tuning control techniques.</p> <p>In Part One, the dynamic ship positioning control problems and basic components …
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Anti-sway control of a construction crane modeled as a two-dimensional pendulum
… in the hands of the operator. The problem of controlling sway of the load due to crane motion, or wind effects must be solved dynamically by the operator to increase productivity and maintain safety. At the hands of inexperienced operators safety is sometimes sacrificed in order to expedite …
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Passivity-Based Control of Small Unmanned Aerial Systems
… the computational cost of the resultant controller}. Passivity-based control presents a method to implement a static, nonlinear state feedback control law that stabilizes the motion of an aircraft with a large region of attraction. {color{black} The energy-based control scheme is applied …
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Design of a decentralized model reference adaptive controller for a mobile robot
Control systems for robotic manipulators have been investigated for several years. The difficulty in designing a controller for a robotic manipulator is due to the highly nonlinear, time-varying dynamics. Closed-loop constant gain controllers are effective when the robot is expected to perform a …
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