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 24 for “"Boundary Control"”.
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Optimization of an airfoil's performance through moving boundary control
The boundary-layer behavior over an airplane's wings is of great importance in take-off and landing of the airplane. If its angle of attack is increased past a critical value, the flow separates from the lifting surface, resulting in a drastic loss of lift and a major increase in drag. In response …
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Practical Implementation of Boundary Control for Dc-Dc Power Conversion
Boundary control is a geometrically based design technique that uses the state trajectories of a dc-dc converter to formulate a control law that defines the state of the active switch in the converter. Unlike conventional methods, boundary controllers guarantee large signal stability. In this …
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Optimal Dirichlet boundary control problems of high-lift configurations with control and integral state constraints
Diese Arbeit behandelt Optimalsteuerungsprobleme mit Navier-Stokes Gleichungen. In dieser Arbeit haben wir zwei Optimalsteuerungsprobleme untersucht, die die Umströmung von Tragflügeln in Hochauftriebskonfigurationen betrachten. Im stationären Fall, möchten wir den Auftrieb maximieren während der …
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Control of Burgers' Equation With Mixed Boundary Conditions
We consider the problems of simulation and control for Burgers' equation with mixed boundary conditions. We first conduct numerical experiments to test the convergence and stability of two standard finite element schemes for various Robin boundary conditions and a variety of Reynolds numbers. These …
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Methods of Computing Functional Gains for LQR Control of Partial Differential Equations
… methods for computing functional gains to boundary control problems for the heat equation. These methods require us to solve various equations including the algebraic Riccati equation, the Riccati partial differential equation and the Chandrasekhar partial differential equations. Numerical …
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Darbo ir gyvenimo balanso, ribų kontrolės ir psichologinio atsiribojimo sąsajos /
… the relationship between work-life balance, boundary control, and psychological detachment. The analysis also examined the expression of work-life balance by socio-demographic variables and its associations with physical and psychological health, and life domain satisfaction. Using the …
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Design and control strategy of a flexible, hyper-redundant robotic arm using electroactive dielectric polymers
… Furthermore, this thesis presents a control strategy called partial differential equation (PDE) boundary control in hopes to effectively control arms of this nature. Experimental results are presented on PDE boundary control to validate its effectiveness.
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Check reduction in red oak (Quercus spp.) lumber using diffusion resistant coatings
… the possibility of reducing surface checking by controlling the lumber boundary conditions. Boundary control was accomplished by applying a coating directly to the lumber surfaces.· The investigation included development of a computerized simulation to model drying behavior, testing a number of …
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Approximation and Control of the Boussinesq Equations with Application to Control of Energy Efficient Building Systems
… theoretical and numerical results for a feedback control problem defined by a thermal fluid. The problem is motivated by recent interest in designing and controlling energy efficient building systems. In particular, we show that it is possible to locally exponentially stabilize the nonlinear …
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The buffalo wars
… and other government agencies have tried to control the situation by exercising a lethal form of boundary control for buffalo, though other wildlife species are unregulated. Animal advocates dispute the agencies' tactics. Native Americans wonder why the buffalo are entirely under agency …
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Adaptive Finite Element Methods for Optimization in Partial Differential Equations
A new approach to error control and mesh adaptivity is described for the discretization of optimal control problems governed by (elliptic) partial differential equations. The Lagrangian formalism yields the first-order necessary optimality condition in form of an indefinite boundary value problem …
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Model Predictive Control for Partial Differential Equations
… thesis we are concerned with model predictive control (MPC) of partial differential equations. The idea is to approximate an infinite time horizon optimal control problem by a sequence of finite horizon optimal control problems. The optimization horizon plays a crucial role in the stability …
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A Theoretical Synthesis of Telecommuting and Incidence of Family Violence
… 3.) crowding; 4.) social isolation; and, 5.) boundary control. How these variables interact within the telecommuting paradigm is described. Ultimately this work serves as a platform from which future empirical research may be conducted.
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Boundary condition effects on vibrating cantilever beams
… have made them attractive solutions to many controlled motion systems such as nanopositioners or linear platforms. However, in some applications the stiffness requirements for the devices to function properly and the stiffness requirements for devices to survive outside effects such at …
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Stabilized finite element solution of optimal control problems in computational fluid dynamics
… thesis discusses the solution of optimal flow control problems, with an emphasis on solving optimal design problems involving blood as the fluid. The discretization of the governing equations of fluid flow is accomplished using stabilized finite element formulations. Although frequently and …
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Robust optimal boundary and spatial field control of distributed parameter systems
The control of distributed parameter systems (DPS) is an interesting and challenging research field studied since the 1960s. An increasing number of DPS control problems in aerospace, materials, chemistry, biology, and other disciplines have attracted many mathematicians and engineers to this field …
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Dynamics and control of robotic aircraft with articulated wings
… concerning the performance, stability and control of robotic aircraft with articulated wings in gliding flight. Speci cally, we are interested in aircraft without a vertical tail, which would then use wing articulation for longitudinal as well as lateral-directional control. Although the …
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Distributed Parameter Control of Thermal Fluids
We consider the problem of controlling a thermal convection flow by feedback. The system is governed by the Boussinesq approximation of the coupled set of Navier-Stokes and heat equations. The control is applied through Dirichlet boundary conditions. We concentrate on a two-dimensional mode and use …
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Partial differential equation-based surface modelling and applications.
… in CAD, CAM and CAE systems and lacks effective boundary control methods, the numerical solution for PDE-based surface modelling has few engineering applications. Second, there is no unified framework for solving different modelling problems. Existing research studies use special PDE-based …
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Preconditioning of Karush--Kuhn--Tucker Systems arising in Optimal Control Problems
… but to study systems arising in linear quadratic control problems governed by partial differential equations. The KKT matrix is symmetric, nonsingular, and indefinite. For the solution of the linear systems generalizations of the conjugate gradient method, MINRES and SYMMLQ, are used. The …
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