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.
Results
Showing 1 to 20 of 20 for “"nonlinear optimal control"”.
-
Some results on nonlinear optimal control
… thesis work. They deal with certain aspects of optimal control of systems in which the system equations are nonlinear, the cost integrand is non- quadratic, or both. The first paper deals an extension from the linear-quadratic case to systems as just described of the so called Newton-Kleinman …
-
Active Suppression ofAerofoil Flutter via Neural-Network-Based Adaptive Nonlinear Optimal Control
… suppression (AFS) on aerofoils via adaptive nonlinear optimal control using neural networks (NNs). Aeroelastic flutter can damage aerofoils if not properly controlled. AFS not only ensures flutter-free flight but also enables the use of aerodynamically more efficient lightweight aerofoils. …
-
A factorization approach for solving the Hamilton-Jacobi equations in nonlinear optimal control
… a necessary and sufficient condition for an optimal control, is very difficult to solve for general nonlinear systems, and therefore its application remained limited to linear systems. Yet, the HJE has been studied extensively in the literature from diverse areas of science and engineering, …
-
Nonlinear optimal control and near-optimal guidance strategies in spacecraft general attitude maneuvers
Solving the optimal open-loop control problems for spacecraft large-angle attitude maneuvers generally requires the use of numerical techniques whose reliability is strongly case dependent. The primary goal of this dissertation is to increase the solution reliability of the associated nonlinear …
-
A "HUM" conjugate gradient algorithm for constrained nonlinear optimal control : terminal and regular problems
Optimal control problems often arise in engineering applications when a known desired behavior is to be imposed on a dynamical system. Typically, there is a performance and controller use trade-off that can be quantified as a total cost functional of the state and control histories. Problems stated …
-
A new method for suboptimal control of a class of nonlinear systems
"This research focuses on developing a new nonlinear control systhesis technique (theta-D approximation). This approach obtains suboptimal solutions to nonlinear optimal control problems by finding an approximate solution to the Hamilton-Jacobi-Bellman (HJB) equation."--Abstract, page iii.
-
Real-time path-planning using mixed-integer linear programming and global cost-to-go maps
… the advance in the fields of computer science, control and optimization, it is now possible to build aerial vehicles which do not need pilots. An important capability for such autonomous vehicles is to be able to generate their own path to navigate in a constrained environment and accomplish …
-
A Gauss pseudospectral transcription for optimal control
A pseudospectral method for solving nonlinear optimal control problems is proposed in this thesis. The method is a direct transcription that transcribes the continuous optimal control problem into a discrete nonlinear programming problem (NLP), which can be solved by well-developed algorithms. The …
-
Development and applications of novel optimal control algorithms
… and improve the existing knowledge of a dynamic optimal control technique known as DISOPE. so as to make it attractive on one hand for its implementation in the process industry and, on the other hand, as a novel nonlinear optimal control algorithm. The main feature of the technique is that it …
-
Optimal Control in Aircraft Trajectory Planning
… performance objectives. This thesis investigates optimal control as a refinement tool for trajectory-planning problems that are typically addressed using geometric or search-based methods. Two case studies are considered. The first addresses loss-of-thrust contingency landing for a fixed-wing …
-
Development of a nonlinear predictive control algorithm and its application to flotation
… first is the development of a method of solving nonlinear optimal control problems. This method is then used to solve the underlying optimal control problems. This method is then used to solve the underlying optimal control problem in a nonliear model predictive control (NMPC) strategy. By way of …
-
Optimal Paths in Gliding Flight
… are considered. The problem is addressed using optimal control theory. The length scales of interest for path planning are within a few turn radii. First, an approach is developed for planning minimum-time paths, for a fixed speed glider, that are sub-optimal but are guaranteed to be feasible in …
-
Solar Sailing Adaptive Control Around the Earth-Moon Lagrange Point L4 for Stellar Observations
… designed using low-thrust propulsion in a nonlinear optimal control problem.</p> <p>We further transition solar sailing periodic orbits to a higher-fidelity ephemeris model to account for actual celestial distances and planes of motion, as opposed to the CR3BP and BCR4BP. In short, we …
-
Optimal control and model reduction for wave energy systems: A moment-based approach
… objective is the availability of appropriate control technology, suchthatenergyconversionisperformedaseconomicallyaspossible,minimisingthedelivered energy cost, while also maintaining the structural integrity of the device, minimising wear on WEC components, and operating across a wide range …
-
Optimal control of wave energy converters
… exerted by waves. This thesis addresses the control of oscillating body WECs and the objective of the control system is to optimise the motion of the devices that maximises the energy absorption. In particular, this thesis presents the formulation of the optimal control problem for WECs in …
-
Dynamic Neural Network-based Adaptive Inverse Optimal Control Design
… Network (DNN) model based adaptive inverse optimal control design for a class of nonlinear systems. A DNN structure is developed and stabilized based on a control Lyapunov function (CLF). The CLF must satisfy the partial Hamilton Jacobi-Bellman (HJB) equation to solve the cost function in …
-
Modelling and control of an articulated underground mining vehicle
… and discussed. Lastly, two localization and control methods are given and evaluated. The first method is an open-loop nonlinear optimal control strategy with periodic position resetting and the second method is a pathtracking controller. AFRIKAANS : Automatisering van die laai-, vervoer- en …
-
Guidance and control of swarms of spacecraft
… challenge in guidance, navigation, and control. This dissertation deals with the guidance and control algorithms required to enable the flight of spacecraft swarms. The algorithms developed in this dissertation are focused on achieving two main goals: swarm keeping and swarm …
-
Analysis and Design of Stable and Optimal Energy Management Strategies for Hybrid Electric Vehicles
… the secondary source of energy is a challenging control and optimization problem. The energy management strategy in a HEV aims at finding the optimal distribution of energy between the battery and the fuel to satisfy the requested power from the driver.Different energy management strategies have …
-
Using Reinforcement Learning and Bayesian Optimization on Problems in Vehicle Dynamics and Random Vibration Environmental Testing
… of the understanding and application of control systems is paramount for success. For relatively simple dynamic systems, model-based analytical control policies can be created without too much trouble (such as Proportional-Integral-Derivative (PID) or Linear-Quadratic-Regulator (LQR) …