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 27 for “"Non-minimum Phase"”.
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Adaptive Augmentation of Non-Minimum Phase Flexible Aerospace Systems
… These characterizations resulted in linear and nonlinear models developed for each testing configuration. The linear models were used to design linear controllers to regulate the nominal plant’s dynamical states. These controllers were then augmented with direct adaptive output regulation and …
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Control Design for a Non-Minimum Phase Hypersonic Vehicle Model
… challenges for control design. In this thesis, a nonlinear controller for a hypersonic vehicle model is designed using the Indirect Manifold Construction approach. The high fidelity hypersonic vehicle model considered in this thesis includes many of the challenging effects of hypersonic flight. …
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Fractional Order Identification Method and Control: Development of Control for Non-Minimum Phase Fractional Order System
… to voltage levels suitable for connecting three phase inverters to distribution level networks. As grid-connected solar power levels continue to increase, there is a corresponding need for improved modeling and control of power electronic converters. In particular, higher levels of boost ratios …
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Adaptive Output Feedback Stabilization of Nonlinear Systems
… output feedback controller design techniques for nonlinear systems subject to different system restrictions. The problem of controlling the heart dynamics in a real time manner is formulated as an adaptive learning output-tracking problem. For a class of nonlinear dynamic systems with unknown …
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Improvements to a key contributor of frequency control : the co-ordination of guide vane operation in a pumped storage plant
… was selected. Pumped storage units exhibit a non-minimum phase characteristic which can negatively affect the frequency response on the grid. Attempts were made to improve this system’s contribution to frequency control. To achieve this, the main waterway, including surge tank and guide vanes …
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Direct Adaptive Control for Stability and Command Augmentation System of an Air-Breathing Hypersonic Vehicle
… Direct Adaptive Control scheme for stabilizing a non-linear, physics based model of the longitudinal dynamics for an air breathing hypersonic vehicle. The model, derived from first principles, captures the complex interactions between the propulsion system, aerodynamics, and structural dynamics. …
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Robust adaptive sampled-data control design for MIMO systems: Applications in cyber-physical security
… (SD) framework. Multi-input multi-output non-square (underactuated) systems are considered with different sampling rates for inputs and outputs. The sampled-data framework allows to address non-minimum phase systems, subject to less restrictive assumptions as compared to continuous time …
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DEVELOPMENT OF ADAPTIVE ROBUST SCHEMES FOR NONLINEAR UNCERTAIN SYSTEMS
… of control systems applicable to some classes of nonlinear uncertain systems. Associating the adaptive control techniques with other control methods, such as backstepping control method and variable structure control method, we propose new adaptive robust control schemes for nonlinear dynamical …
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Dynamic matrix control of milling circuits
… of processes which exhibit strong interactions, non-minimum phase behavior, and operate at constraints. Other control schemes falling into this category are Model Algorithmic Control (MAC) and Internal Model Control (IMC). Details of MAC are largely proprietary, while the frequency-based IMC …
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Iterative learning control: algorithm development and experimental benchmarking
… next one. The first experimental facility is a non-minimum phase electro-mechanical system and the other is a gantry robot whose basic task is to pick and place objects on a moving conveyor under synchronization and in a fixed finite time duration that replicates many tasks encountered in the …
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High performance path following for marine vehicles using azimuthing podded propulsion
… sideforce and moment cause the ship to enter the nonlinear realm sooner than a ruddered vessel. Furthermore if the rudder or azimuthing propulsor is aft of the vessel's center of gravity then the system is non-minimum phase; during a turn the ship center initially moves in the direction opposite …
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Direct Adaptive Control for a Trajectory Tracking UAV
… significant wind gust disturbances. Full 6-DOF nonlinear and linear UAV simulation models are developed and used to study the performance of the direct adaptive control system for various scenarios. A stability proof is developed to prove convergence of the direct adaptive control system under …
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Active control of an automobile suspension system for reduction of vibration and noise
… proved to be difficult, due to undesirable non-minimum phase dynamics.
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Control and design of flexible-link manipulators
The control of non-minimum phase systems remains an important open problem in nonlinear control, finding relevance in the control of underactuated and flexible systems. One wishes to cause the output of a dynamical system to track a desired trajectory while maintaining internal stability of a …
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Generalized Predictive Control Parameter Adaptation Using a Fuzzy Logic Approach
… how GPC gains control and how it can fail for non-minimum phase plants. A set of fuzzy logic modules is developed to adapt &lambda with order fixed, and conversely to adapt order with &lambda fixed. The effectiveness of the method is demonstrated in both numerical simulations and laboratory …
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Control strategies for exothermic batch and fed-batch processes A sub-optimal strategy is developed which combines fast response with a chosen control signal safety margin. Design procedures are described and results compared with conventional control.
… maximum allowable reaction temperature Tmax. The non-minimum phase problem can be considered as one of the difficulties in managing exothermic fed-batch process when cold reactant Is added to vessel at the maximum operating temperature. The control system coped with this within limits, a not …
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Force and strain feedback for distributed actuation
… compared well to the results of beam models. Non-minimum phase zeroes encountered for certain values of the mixing coefficient in both the models and the experiments limit the range in which the mixed transfer function is attractive for feedback control.
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Applied Nonlinear Control of Unmanned Vehicles with Uncertain Dynamics
… a solid control framework for a wide class of nonlinear uncertain systems, with a special emphasis on issues related to implementation, such as control input amplitude and rate saturation, or partial state measurements availability. More specifically, an adaptive control framework, allowing to …
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Robust control of nonlinear systems in the presence of uncertainties
… effectively deal with systems in the presence of nonlinearity and uncertainty, and some stability theory can be developed.<br/><br/>The techniques developed here are concerned with both robust stability control design and robust tracking control design for SISO and MIMO nonlinear uncertain systems …
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Control predictivo con modos deslizantes
… processes that can be modelled as systems of non-minimum phase and as systems with high delays. Additionally several simple tuning rules have been developed, and they provide stable and smooth responses, even with a high level of structured and unstructured uncertainty in the model. The …
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