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 43 for “"Time-varying Systems"”.
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Adaptive Control for Nonlinear, Time Varying Systems
<p>It is common for aerospace systems to exhibit nonlinear, time varying dynamics. This thesis investigates the development of adaptive control laws to stabilize and control a class of nonlinear, time varying systems. Direct adaptive control architectures are implemented in order to compensate for …
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Model Reduction for Linear Time-Varying Systems
The thesis treats model reduction for linear time-varying systems. Time-varying models appear in many fields, including power systems, chemical engineering, aeronautics, and computational science. They can also be used for approximation of time-invariant nonlinear models. Model reduction is a topic …
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A Study of Equivalence in Linear Time-Varying Systems
Made available in DSpace on 2014-12-04T21:03:31Z (GMT). No. of bitstreams: 1 6206181.pdf: 2113664 bytes, checksum: 8bed48e7c5ffb4da2b80fcdd7c9ae917 (MD5) Previous issue date: 1962
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Reinforcement Learning in Time-Varying Systems: an Empirical Study
… an impractical solution for many real-world systems problems. A particularly challenging case occurs when the environment changes over time, i.e. it exhibits non-stationarity. In this work, we characterize the challenges introduced by non-stationarity and develop a framework for addressing …
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Analysis and control of linear periodically time varying systems
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1991.
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Time average feedforward control techniques for time varying systems
… intensive system identification process. The Time Average approach is a technique that promises to be a major advance in the active control of sound and vibration. This approach is based on statistical estimates of the error signals, and does not require having previous knowledge of the …
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Learning identification and control for repetitive linear time-varying systems
Made available in DSpace on 2014-09-16T17:24:09Z (GMT). No. of bitstreams: 4 Nanjun_Liu.pdf: 1906690 bytes, checksum: 8dbea3fca41b4d849a4d78366fbd4815 (MD5) Liu_Nanjun.docx: 3371465 bytes, checksum: 1a508216ccdaedd42b35765484ed7c6b (MD5) 1_Liu_Nanjun.docx: 3371465 bytes, checksum: …
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Modeling and identification of time-varying systems - A wavelet approach
… of boundedinput bounded-output (BIBO) time-varying (TV) system impulse responses based on a wavelet approach. This approach permits representation of a time-varying system impulse response in the auxiliary domains, commonly referred to as the transform domains. The latter includes the …
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Identification of nonlinear and time-varying systems under dynamic and seismic excitation
L'abstract è presente nell'allegato / the abstract is in the attachment
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ΑΝΑΛΥΣΗ - ΑΝΑΓΝΩΡΙΣΗ - ΑΡΙΣΤΟΣ ΕΛΕΓΧΟΣ ΚΑΙ ΕΥΑΙΣΘΗΣΙΑ ΓΡΑΜΜΙΚΩΝ ΣΥΣΤΗΜΑΤΩΝ ΜΕ ΤΗΝ ΧΡΗΣΗ ΣΕΙΡΩΝ
… APPLICATION IN PROBLEMS OF AUTOMATIC CONTROL SYSTEMS. THE FOLLOWING PROBLEMS OF LINEAR SYSTEMS ARE BEING STUDIED: A) ANALYSIS OF TIME-INVARIANT AND TIME-VARYING SYSTEMS THAT ARE DESCRIBED BY STATE SPACE OR BY N-TH ORDER DIFFERENTIAL EQUATIONS. B) IDENTIFICATION OF TIME-INVARIANT AND …
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A Linear, Time-Varying System Framework for Bandlimited Signal Extrapolation
… for modeling, analyzing, and designing linear, time-varying systems is used to study several aspects of bandlimited signal extrapolation, the problem of reconstructing the whole of a bandlimited signal from a known piece. The extrapolation of both continuous-time and discrete-time signals is …
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ANALYSIS AND DESIGN OF PERIODICALLY TIME-VARYING DIGITAL FILTERS
A description of periodically time-varying systems was developed which completely characterizes the relationship between the spectra of the input and output signals of these systems. The description is the bi-frequency map. This description completely separates the time-invariant and time-varying …
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Estimation and Control of Autonomous Vehicles Over Networks
… applicable to all continuous multi-rate linear time varying systems.
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Model Reduction of Linear Time-Periodic Dynamical Systems
… model reduction techniques exist for dynamical systems whose parameters vary with time. We have particular interest here in linear time-periodic dynamical systems; we seek a structure-preserving algorithm for model reduction of linear time-periodic (LTP) dynamical systems of large scale that …
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Controllability, Observability and Realizability
… we analyze the theory of and solutions to linear time systems, continuous and discrete time systems, time-varying systems, and first-order matrix Sylvester systems. Examples and sample computed calculations are provided for both uncontrolled and controlled systems. We also develop a new method for …
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Stability and performance of time-varying adaptive systems: Analysis and applications
… prediction and adaptive control of systems with unknown time-varying parameters, with an emphasis on obtaining performance bounds. While these issues have been extensively studied in the case of time invariant systems, time-varying systems have not received much attention. This …
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Learning-based Optimal Control of Time-Varying Linear Systems Over Large Time Intervals
… of two-point boundary optimal control of linear time-varying systems with unknown model dynamics using reinforcement learning. Leveraging singular perturbation theory techniques, we transform the time-varying optimal control problem into two time-invariant subproblems. This allows the utilization …
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Analysis and design of control systems by means of time domain matrices
… analysis and design for complex control systems. This method is the time domain infinite matrix method. The formulation of the infinite matrix follows from the convolution summation of sampled data systems The mathematical basis of the time domain matrix formulation is presented in a …
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System Identification via the Proper Orthogonal Decomposition
… application to large, complex structures can be time-consuming and errors in the modeling process may negatively affect the accuracy of analyses based on the model. System identification techniques attempt to circumvent these problems by using experimental response data to characterize or …
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Optimal feedback control for nonlinear discrete systems and applications to optimal control of nonlinear periodic ordinary differential equations
… of the optimal feedback control for nonliner systems (both discrete and ODE) and nonquadratic cost functions in order to achieve improved performance and larger regions of asymptotic stability in the nonlinear system context. The main work of this thesis is carried out in two parts; the first …
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