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 21 for “"Parameter system"”.
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The effects of noise on measurements made in a distributed parameter system.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1972. M.S.
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Generating Paraphrases with Greater Variation Using Syntactic Phrases
Given a sentence, a paraphrase generation system produces a sentence that says the same thing but usually in a different way. The paraphrase generation problem can be formulated in the machine translation paradigm; instead of translation of English to a foreign language, the system translates an …
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Analysis of passive and active discrete-distributed linear dynamical systems using Green's function methods
… linear passive discrete-distributed mechanical systems has been performed, unifying and extending previous results in the field. A distributed parameter system, represented by the Green's function of its governing differential equation, and a multiplicity of arbitrarily located lumped parameter …
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Modeling, Approximation, and Control for a Class of Nonlinear Systems
… estimation, and control for classes of nonlinear systems whose state evolves in space $mathbb{R}^n times H$, where $mathbb{R}^n$ is a n-dimensional Euclidean space and $H$ is a infinite dimensional Hilbert space. Specifically, two classes of nonlinear systems are studied in this dissertation. The …
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X-ray and neutron scattering studies of the Rb₂MnF₄ and Cu₁âõxMgx̳GeO₃ in an external magnetic field
… had previously been achieved for a high-spin system. Comparison of our results with current theories indicate that the probed temperature region lies in a crossover region from classical to renormalized classical behavior. In addition, we show measurements of both the quasielastic and magnon …
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Parameter identification in distributed structures
… two new techniques for the identification of parameters in distributed-parameter systems. The first technique identifies the physical parameter distributions such as mass, damping and stiffness. The second technique identifies the modal quantities of self-adjoint distributed-parameter systems. …
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A method for approximating and controlling the distributed parameter model of a MIMO chemical diffusion system
… is an important factor in many biological systems. Chemotaxis, the directed movement of an organism in response to chemical in its environment, is known to be a prominent driver in the directed growth of new blood vessels from pre-existing ones, a phenomenon called angiogesis. In order to …
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Electromechanical Modeling of Encapsulated Ionic Polymer Transducers
… accuracy of the model by using distributed parameter system modeling to create the mechanical terms used in the model. Modal expansion is used to extend the applicability of the mechanical impedance terms through multiple resonances of the transducer. The test setup as well as the …
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New Models for Crowd Dynamics and Control
… relationship, while the other three models are systems of hyperbolic partial differential equations. For one of the system models presented, we show how it can be derived independently from a microscopic crowd model. The models are nonlinear, time-varying, hyperbolic partial differential …
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Analogy matching with function, flow and performance
… be effective. The Design Analogy Performance Parameter System (DAPPS) project presented here is developing a method to aid in analogy generation by specifying a set of critical functions and desired design performance improvements. DAPPS uses performance parameter metrics to compare user …
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Development of ultrasensitive electrochemical sensors based on nanocomposites for environmental applications
… not only aquatic life but the surrounding ecosystem as well. The presence of organic and inorganic micropollutants such as carbamate pesticides and heavy metals in water is a crucial water problem generated from industrial effluents, mining wastes, or domestic sewage, and the widespread use of …
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A Wavelet-Based Rail Surface Defect Prediction and Detection Algorithm
… consisting of operating conditions and physical parameters. To generate this training data, a dynamic wheel-rail interaction model was developed that relates defect geometry to the side frame vertical acceleration signature. The model was generated by using combined systems dynamic modeling, and …
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Modeling and Control of SPIDER Satellite Components
… mathematical framework based on distributed parameter system theory is presented in describing the dynamics of augmented membranous structures. In particular, Euler-Bernoulli beam theory and thin plate theory are used to describe the integration of piezoelectric material with membranes. In …
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Parametric and nonparametric identification of shell and tube heat exchanger mathematical model
… they provide information about controlling a system operation. Without the model, the control task would be difficult for tuning of controller. For many years, researchers have studied these models; however, their models are still less satisfactory since they are not in general form. This …
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Convergence of Kernel Methods for Modeling and Estimation of Dynamical Systems
… for representing the uncertain dynamical systems, concerns also arise regarding the reliability of these methods. Recent developments in approximation theory provide a new perspective to studying these problems. This dissertation analyzes the convergence of two kernel-based, data-driven …
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Ramsey theory and its application
… First, we prove a self-dual Ramsey theorem for parameter systems which is a generalization of the self-dual Ramsey theorem developed by Solecki. Second, we prove a Ramsey theorem for finite sets equipped with a partial order and a fixed number of linear orders extending the partial order. Third, …
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Vertical dynamics of railway vehicle-track system
… element (FE) model of railway vehicle-track system is developed to study the dynamic interaction between the vehicle and track. The vehicle is represented by a lumped parameter system. The track is modeled as a Timoshenko beam on discrete pad-tie-ballast supports. The tie is considered either …
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Parameter identification and control of distributed-parameter systems
… for the control implementation of distributed-parameter systems are presented. The methods are designed to identify and control the actual distributed system, without resorting to discretization. They are implemented using discrete sensors and actuators. The identification process is carried …
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Optimization based control design techniques for distributed parameter systems
… based control design techniques for the systems that are governed by partial differential equations. A control technique is developed for systems that are actuated at the boundary. The principles of dynamic inversion and constrained optimization theory are used to formulate a feedback …
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Real-time data assimilation in nonlinear dynamical systems
… infer the thermoacoustic states and heat release parameters on the fly without storing data (real-time). We perform twin experiments using synthetic acoustic pressure observations to analyse the performance of data assimilation in all nonlinear thermoacoustic regimes, from limit cycles to chaos, …
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