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 30 for “"Parameter Varying"”.
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Robust Control of Input-Delay Linear Parameter-Varying (LPV) Systems
Practical systems are nonlinear and time-varying and thus linear techniques can expose their control design to extra conservatism. Nevertheless, the Linear Parameter-Varying (LPV) representation can effectively describe them, which in contrast to linearization, maintains the principal dynamic modes …
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Temperature Dependent Robust Control Of Hard Disk Drives Using Parameter Varying Techniques
A hard disk drive (HDD) is a device that stores digital data by writing and reading magnetic signals onto a disk using a magnetic transducer. The data is organized into circular tracks that are less than 100 nm wide. Modern HDDs use a dual-state actuator to position the transducer onto these …
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A linear parameter varying control methodology for reduction of helicopter higher harmonic vibration
… developed in this thesis uses the Linear Parameter Varying (LPV) synthesis method, which provides performance and stability guarantees over the advance ratio parameter space. The three controllers are evaluated in the RCAS environment at fixed and maneuvering flight conditions. The results …
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Linear Parameter Varying Path Following Control of a Small Fixed Wing Unmanned Aerial Vehicle
… aircraft was developed through application of parameter estimation techniques to simulated flight test data. Multiple controllers were devised based on this model for path following, including a self-scheduled linear parameter-varying (LPV) controller with path curvature as a scheduling …
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Multivariable Modeling and Control of the Response to Anesthesia
… invariant (LTI), piecewise linear switching and parameter-varying, are investigated and verified. Robust gain scheduled controllers are constructed and simulated using a linear parameter varying (LPV) framework. The use of multivariable state-space models for patient modeling is novel in this …
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Modeling and Control of an Active Dihedral Fixed-Wing Unmanned Aircraft
… Simulations were completed using linear parameter-varying (LPV) models, derived from traditional Newtonian aircraft dynamics and associated kinematic equations, to improve the modeling of the nonlinear active dihedral system. The stability of the LPV system was evaluated using Lyapunov …
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Robust Controller Interpolation With Application to Gain-Scheduling
… interpolation criteria is translated into a parameterization of all stabilizing interpolated controllers leveraging a Youla controller parameterization. Second, an interpolation framework is proposed for cases that lack an appropriate controller parameterization. The proposed framework …
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A Semidefinite Programming Approach for Control of Systems Along Trajectories
… trajectory, resulting in a nonstationary linear parameter-varying (NLPV) model, and then constructing an NLPV synthesis. Synthesis conditions are derived for NLPV systems using an operator theoretic framework with the ℓ 2-induced norm as the performance measure. These conditions are given in …
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Computationally Driven Algorithms for Distributed Control of Complex Systems
… assumed for the subsystems are linear time-varying or linear parameter-varying. Linear time-varying models are useful for describing nonlinear equations that are linearized about prespecified trajectories, and linear parameter-varying models allow for capturing the nonlinearities of the …
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On-line estimation approaches to fault-tolerant control of uncertain systems
… via Sliding Mode Observer (SMO); linear parameter-varying (LPV) control; two-level distributed control with learning coordination.
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Modeling and Control of Tensegrity-Membrane Systems
… of tensegrity-membrane systems using a linear parameter-varying (LPV) controller during system deployment. A gridding method is employed to discretize the system operational region in order to carry out the LPV control synthesis.
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Convex Modeling Techniques for Aircraft Control
… One such design method leads to a linear parameter varying (LPV) controller that changes based on the real-time variation of system dynamics. Before such a controller can be designed, the system has to also be represented as an LPV system. The current effort proposes a LPV modeling …
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Mean-value modelling and robust control of the airpath of a turbocharged diesel engine.
… of the engine is derived with a focus on the parameterisation of the turbocharger. The effect of heat transfer via the turbocharger housing on the efficiencies derived from temperature measurements is identified as being very significant at low speed and load points regularly met on emission …
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Characterization of turbine rim seal flow and its sealing effectiveness
… links between flow processes and their drivers. Varying the axisymmetric turbine flowpath pressure on a quasi-steady basis when the purge flow supply seal is choked has no impact on ingestion; the pressure field in the wheelspace merely scales with the flowpath pressure, leaving the flow …
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Robust scheduling control of aeroelasticity.
… The controllers are constructed using a Linear Parameter Varying (LPV) framework, where the plant and controllers can be represented as linear systems which are functions of a parameter, in this case airspeed. The LPV controllers are constructed using Linear Matrix Inequalities (LMIs), which are …
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Fault-Tolerant Control and Fault-Diagnosis Design for Over-Actuated Systems with Applications to Electric Ground Vehicles
… robust controller based on the linear-parameter varying (LPV) technology is designed to against the actuator faults. The eigenvalue positions of the system matrix of the closed-loop system are also constrained into a disk to obtain better transient responses. Both of the proposed FT …
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Observer-based robust fault estimation for fault-tolerant control
… smooth non-linear systems via the use of linear parameter-varying systems (LPV) modeling.The main contributions of the research are thus:- The development of a robust observer-based FE method and integration design for the FE and AFTC systems with the bounded time derivative fault magnitudes, …
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L1 adaptive control within Learn-to-Fly
… algorithm adjusts the vehicle model and to be parameterized (which can be captured by linear parameter-varying (LPV) models) by different flight conditions. This document extends L1 control theory for switched linear reference systems and LPV reference systems and proves that the actual …
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Simulations of interfacial dynamics of complex fluids using diffuse interface method with adaptive meshing
… as having a finite thickness with a phase-field parameter varying continuously from one phase to the other. Adaptive meshing is applied to produce fine grid near the interface and coarse mesh in the bulk. It leads to accurate resolution of the interface at modest computational costs. An advantage …
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