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 36 for “"time-invariant systems"”.
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Wavelets Based on Second Order Linear Time Invariant Systems, Theory and Applications
… the response of Second Order Underdamped Linear-Time-Invariant (SOULTI) systems, while the second is a generalization of the first to the complex domain and is similar to the Laplace transform kernel function. The first takes the acronym of SOULTI wavelet, while the second is named the Laplace …
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On the synthesis of switched output feedback controllers for linear, time-invariant systems
The theory of switching systems has seen many advances in the past decade. Its beginnings were founded primarily due to the physical limitations in devices to implement control such as relays, but today there exists a strong interest in the development of switching systems where switching is …
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Numerical solutions of matrix equations arising in model reduction of large-scale linear -time -invariant systems
… equations arising from model reduction of linear-time-invariant (LTI) systems. Such systems arise in a variety of areas, especially in circuit simulation. When an integrated circuit has millions of devices, performing a full-system simulation can be infeasible due to the time required for the …
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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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Imprecise computation in real-time control systems
… is concerned with the behavior of corrupted real-time control systems and their corrupted trajectories. The difference between the corrupted trajectory and the precise trajectory is called the tracking error. We analyze the consequence of imprecise computation, caused by corrupted input and/or …
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Optimal control of dynamical systems with time-invariant probabilistic parametric uncertainties
… model identification software that produces time-invariant parameter uncertainties typically in the form of probability distribution functions. This doctoral thesis derives rigorous theory and algorithms for the optimal control of dynamical systems with time-invariant probabilistic …
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Nonlinear and Hybrid Feedbacks with Continuous-Time Linear Systems
In this thesis we study linear time-invariant systems feedback interconnected with three specific nonlinear blocks; a play/stop operator, a switching-reset mechanism, and an adaptive dead-zone. This setup resembles the Lure problem studied in the absolute stability framework, but the types of …
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Baiting for defense against stealthy attacks on cyber-physical systems
… stealthy cyber-attack is detected in near real time. Improvements in networked communication have enabled vast and complex dynamic control systems to exploit networked control schemes to seamlessly integrate parts and processes. These cyber-physical systems exhibit a level of flexibility that …
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L(1)-Optimal Control Using State Space, Controlled Invariance Based Methods
… invariance based solution method to linear time-invariant systems (LTI) is presented first. Also included is a discussion of a related estimation technique which utilizes a set-valued estimation approach to produce an estimate which is optimal in an $\ell\sp{\infty}$-induced norm sense. The …
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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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Decomposition of Time Scales in Linear Systems and Markovian Decision Processes
… of "slow" and "fast" dynamics in large scale systems has motivated the use of singular perturbations as a means of obtaining reduced order models for analysis and control law design. In this thesis we establish how systems having this "two-time-scale" property can use singular perturbation …
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Design principles for linear systems: Stability and optimality
… them deals with problems in the design of linear time-invariant systems with certain prescribed properties, such as stability and cost optimality. The first part addresses theoretical questions arising in the design of autonomous decentralized systems. The network topology of such a system …
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A general linear systems theory on time scales : transforms, stability, and control.
In this work, we examine linear systems theory in the arbitrary time scale setting by considering Laplace transforms, stability, controllability, and realizability. In particular, we revisit the definition of the Laplace transform by Bohner and Peterson in [10]. We provide sufficient conditions for …
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Application of the Filtered-X LMS Algorithm for Disturbance Rejection in Time-Periodic Systems
… rejection methods have been established for time-invariant systems. However, the development of these techniques has not focused on application to time-periodic systems in particular until recently. The filtered-X LMS algorithm is regarded as the best disturbance rejection technique for …
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Model Reduction Using Semidefinite Programming
In this thesis model reduction methods for linear time invariant systems are investigated. The reduced models are computed using semidefinite programming. Two ways of imposing the stability constraint are considered. However, both approaches add a positivity constraint to the program. The input to …
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Attitude control of an underwater vehicle subjected to waves
… seas case. Using known sea spectra and linear time invariant systems theory allows for estimation of the water wave disturbance spectra for these forces and moments. Application of sliding control techniques are then developed for the underwater vehicle longitudinal plane equations of motion. …
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Nonreciprocal coupling to microstrip resonators
… challenge across a wide range of physical systems in electromagnetics, optics, and acoustics. Linear, time-invariant systems are always reciprocal, but reciprocity can be broken through the action of a bias that is asymmetric under time-reversal. Magnetic fields are the most common bias …
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Observability and observer design for switched linear systems
<p>Hybrid vehicles, HVAC systems in new/old buildings, power networks, and the like require safe, robust control that includes switching the mode of operation to meet environmental and performance objectives. Such switched systems consist of a set of continuous-time dynamical behaviors whose …
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Time Scales, Coherency, and Weak Coupling
In this thesis we study a relation between time scales and structural properties of a class of systems represented by power systems. First, the time scale decomposition of linear time invariant systems is studied. The properties of the time scale decomposition are shown to be defined by properties …
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