Dissertations / Theses on the topic 'Nonlinear systems'
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Kozinsky, Inna Roukes Michael Lee Roukes Michael Lee. "Nonlinear nanoelectromechanical systems /." Diss., Pasadena, Calif. : California Institute of Technology, 2007. http://resolver.caltech.edu/CaltechETD:etd-03022007-142824.
Full textSun, Hongyan. "Coupled nonlinear dynamical systems." Morgantown, W. Va. : [West Virginia University Libraries], 2000. http://etd.wvu.edu/templates/showETD.cfm?recnum=1636.
Full textTitle from document title page. Document formatted into pages; contains xi, 113 p. : ill. (some col.). Includes abstract. Includes bibliographical references.
Wei, Jianfeng. "Observation and Estimation of Nonlinear Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=case1143611470.
Full textNersesov, Sergey G. "Nonlinear Impulsive and Hybrid Dynamical Systems." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7147.
Full textEnqvist, Martin. "Linear Models of Nonlinear Systems." Doctoral thesis, Linköping : Linköpings universitet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-5330.
Full textMathew, Manu K. "Nonlinear system identification and prediction /." Online version of thesis, 1993. http://hdl.handle.net/1850/11594.
Full textChow, Po-Chuan. "Recursive nonlinear identification of Hammerstein-type systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1054758543.
Full textNevistić, Vesna. "Constrained control of nonlinear systems." Online version, 1997. http://bibpurl.oclc.org/web/26200.
Full textSenalp, Erdem Turker. "Cascade Modeling Of Nonlinear Systems." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/3/12608578/index.pdf.
Full text2) Introduction of B-Spline curve nonlinearity representations instead of polynomials in cascade modeling. As a result, local control in nonlinear system modeling is achieved. Thus, unexpected variations of the output can be modeled more closely. As an important demonstration case, a model is developed and named as Middle East Technical University Neural Networks and Cascade Model (METU-NN-C). Application examples are chosen by considering the Near-Earth space processes, which are important for navigation, telecommunication and many other technical applications. It is demonstrated that the models developed based on the contributions of this work are especially more accurate under disturbed conditions, which are quantified by considering Space Weather parameters. Examples include forecasting of Total Electron Content (TEC), and mapping
estimation of joint angle of simple forced pendulum
estimation of joint angles of spring loaded inverted double pendulum with forced table
identification of Van der Pol oscillator
and identification of speakers. The operation performance results of the International Reference Ionosphere (IRI-2001), METU Neural Networks (METU-NN) and METU-NN-C models are compared qualitatively and quantitatively. As a numerical example, in forecasting the TEC by using the METU-NN-C having Bezier curves in nonlinearity representation, the average absolute error is 1.11 TECu. The new cascade models are shown to be promising for system designers and operators.
Tsukamoto, Naofumi. "Phase dynamics in nonlinear systems." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136010.
Full textTse, Wilfred See Foon. "Linear equivalents of nonlinear systems." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26652.
Full textScience, Faculty of
Mathematics, Department of
Graduate
Tatlicioglu, Enver. "Control of nonlinear mechatronic systems." Connect to this title online, 2007. http://etd.lib.clemson.edu/documents/1193079994/.
Full textDall, Ian W. "Signals in nonlinear bandpass systems /." Title page, abstract and contents only, 1991. http://web4.library.adelaide.edu.au/theses/09PH/09phd1444.pdf.
Full textGrönberg, Fredrik. "Crowd Control of Nonlinear Systems." Thesis, KTH, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-138438.
Full textPointon, Craig T. "Nonlinear dynamics in telecommunication systems." Thesis, Staffordshire University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282553.
Full textXu, Xu. "Nonlinear systems and cellular maps." Thesis, University of Sheffield, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.538077.
Full textSkrobic, Stevan. "Harmonic Suppression in Nonlinear Systems." Thesis, KTH, Tillämpad fysik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170394.
Full textBatchelor, Andrew. "Modelling of interconnected nonlinear systems." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413386.
Full textSamavat, Mohmoud. "Robust control of nonlinear systems." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327647.
Full textMay, Andrew. "Nonlinear systems in applied mathematics." Thesis, University of Exeter, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.312068.
Full textJang, Stella 1976. "Nonlinear stability of multibody systems." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/82778.
Full textLu, Weiping. "Nonlinear dynamics of optical systems." Thesis, Heriot-Watt University, 1991. http://hdl.handle.net/10399/836.
Full textSayyaddelshad, Saleh. "State estimation of nonlinear systems." Licentiate thesis, Luleå tekniska universitet, Signaler och system, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25774.
Full textGodkänd; 2013; 20131026 (salsay); Tillkännagivande licentiatseminarium 2013-11-25 Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Saleh Sayyaddelshad Ämne: Reglerteknik/Automatic Control Uppsats: State Estimation of Nonlinear Systems Examinator: Professor Thomas Gustafsson, Institutionen för system- och rymdteknik, Luleå tekniska universitet Diskutant: Professor Alexander Medvedev, Avdelningen för systemteknik, Uppsala universitet Tid: Onsdag den 18 december 2013 kl 13.00 Plats: A1545, Luleå tekniska universitet
Nayfeh, Mahir Ali. "Nonlinear dynamics in power systems." Thesis, Virginia Tech, 1990. http://hdl.handle.net/10919/41582.
Full textMaster of Science
Krauss, Ryan. "Experimental Identification of Nonlinear Systems." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36912.
Full textWe then compare this technique with two other techniques that have been presented in the literature. In addition to the amplitude- and frequency-sweep technique presented, we apply a second frequency-domain technique and a time-domain technique to the second mode of a cantilevered beam. We apply the restoring-force surface method assuming no a priori knowledge of the system and use the shape of the surface to guide us in assuming a form for the equation of motion. This equation is used in applying the frequency-domain techniques: a backbone curve-fitting technique based on the describing-function method and the amplitude- and frequency-sweep technique based on the method of multiple scales. We derive the equation of motion from a Lagrangian and discover that the form assumed based on the restoring-force surface is incorrect. All of the methods are reapplied with the new form for the equation of motion. Differences in the parameter estimates are discussed. We conclude by discussing the limitations encountered for each technique. These include the inability to separate the nonlinear curvature and inertia effects and problems in estimating the coefficients of small terms with the time-domain technique.
Master of Science
Hill, Thomas Lewis. "Modal interactions in nonlinear systems." Thesis, University of Bristol, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702150.
Full textPepona, Eleni. "Identification of nonlinear interconnected systems." Thesis, Brunel University, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.540757.
Full textLohmiller, Winfried Stefan 1971. "Contraction analysis of nonlinear systems." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9793.
Full textIncludes bibliographical references (leaves 87-90).
This thesis derives new results in nonlinear system analysis using methods inspired from fluid mechanics and differential geometry. Based on a differential analysis of convergence, these results may be viewed as generalizing the classical Krasovskii theorem, as well as linear eigenvalue analysis. A central feature is that convergence and limit behavior are in a sense treated separately, leading to significant conceptual simplifications. We establish new combination properties of nonlinear dynamic systems and use them to derive simple controller and observer designs for mechanical systems such as aircraft, underwater vehicles, and robots. The method is also applied to chemical chain reactions and mixture processes. The relative simplicity of these designs stems from their effective exploitation of the systems' structural specificities. Next, we analyze and quantify the global stability properties of physical partial differential equations such as the heat equation, or the Schroedinger equation. Lyapunov exponents are not coordinate-invariant, and thus their exact physical meaning is somewhat questionable. As an alternative, we suggest an extension of linear eigenvalue analysis to nonlinear dynamic systems. Finally, the thesis derives new controller and observer designs for general nonlinear dynamic systems. In particular, an extension of feedback linearization is proposed when the corresponding integrability conditions are violated.
by Winfried Stefan Lohmiller.
Ph.D.
Chetwynd, Daley. "Uncertainty propagation in nonlinear systems." Thesis, University of Sheffield, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425587.
Full textRuzziconi, Laura. "Nonlinear dynamics in microelectromechanical systems." Doctoral thesis, Università Politecnica delle Marche, 2011. http://hdl.handle.net/11566/242133.
Full textThis dissertation deals with the nonlinear dynamics in MEMS devices. The nonlinear dynamic topics currently addressed in the literature are essential to investigate their response. The accuracy of the nonlinear dynamic modeling is important to guarantee the reliability of the results and current nonlinear dynamic tools succeed in carefully interpreting the experimental data of the response of these devices. The dissertation considers two different case-studies. The first case-study is a MEMS device with axial load, very shallow arched initial shape and electrostatic and electrodynamic actuation. It is analyzed in the neighborhood of the bifurcation from a single potential well to a twin well. Both the nonlinear static configurations and the linear dynamic analysis cannot be solved in closed form and they are approximated by the Galerkin technique. They are used to derive an accurate single degree of freedom reduced order model of the nonlinear dynamics. In this model the fifth order term (connected to the Taylor expansion in the equation of motion) is removed to obtain a good approximation of the potential wells and of the global behavior. Other reduced order models are considered and compared. The nonlinear dynamic analysis is performed, with the combined use of frequency response curves, attractor-basins phase portraits and behavior charts. In a neighborhood of each natural frequency, the response of the device has the typical characteristics of a softening oscillator. The cases of the single and the double potential well are compared. The second case-study analyzes the experimental dynamic pull-in data at primary resonance for a MEMS device (a capacitive accelerometer). Starting from this particular case, the issue of the dynamical integrity in a mechanical system is addressed. Its qualitative evaluation is performed, choosing the most suitable tools according to the considered experimental conditions. The effectiveness of this analysis is highlighted, showing the accuracy of the curves of constant percentage of integrity factor in interpreting the existence of disturbances in experiments and practice. Also, their use in a design is proposed.
Lei, Hao. "Universal Output Feedback Control of Nonlinear Systems." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1193422144.
Full textBrunke, Shelby Scott. "Nonlinear filtering and system identification algorithms for autonomous systems /." Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/7095.
Full textMattsson, Per. "Modeling and identification of nonlinear and impulsive systems." Doctoral thesis, Uppsala universitet, Avdelningen för systemteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-304837.
Full textKozak, Kristopher C. "Robust command generations for nonlinear systems." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/15849.
Full textSotero, De Menezes Thiago Diniz. "Nonlinear Compensation in Optical Communications Systems using the Nonlinear Fourier Transform." Diss., North Dakota State University, 2017. https://hdl.handle.net/10365/27607.
Full textArain, Muhammad Asif, Ayala Helon Vicente Hultmann, and Muhammad Adil Ansari. "Nonlinear System Identification Using Neural Network." University of Genova (Italy) and Warsaw University of Technology (Poland), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:oru:diva-28937.
Full textStrandberg, Mattias. "Portfolio Optimization with NonLinear Instruments." Thesis, Umeå universitet, Institutionen för fysik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-137233.
Full textTang, Xiafei. "Periodic disturbance rejection of nonlinear systems." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/periodic-disturbance-rejection-of-nonlinear-systems(0bddefd9-2750-47fd-8c92-c90a01b8e1ef).html.
Full textGhassem-Sani, Gholam-Reza. "Recursive nonlinear plans." Thesis, University of Essex, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315683.
Full textDu, Suguo. "Fault detection for polynomial nonlinear systems." Thesis, Coventry University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247208.
Full textSpelman, Graham Michael. "Energy scattering in weakly nonlinear systems." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648253.
Full textManzoni, Marco Tommaso. "New systems for quantum nonlinear optics." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461495.
Full textLos fotones que viajan por el espacio libre no interactúan entre sí. Esta característica los hace perfectos candidatos para transportar la información cuántica a largas distancias. Por otro lado, el procesamiento de la información que codifican requiere mecanismos de interacción. En los últimos años se han realizado esfuerzos crecientes para realizar interacciones fuertes y controladas entre los fotones y para comprender las leyes subyacentes que describen los fenómenos que pueden surgir, generando así el nuevo campo de la "óptica cuántica no lineal". Mientras que los materiales tridimensionales tienen coeficientes no lineales extremadamente débiles, se pueden obtener interacciones entre los fotones haciéndolos interactuar con átomos individuales, que son objetos intrínsecamente no lineales, teniendo la capacidad de absorber únicamente un solo fotón a la vez. La realización de interacciones determinísticas entre fotones y átomos es uno de los principales retos de la óptica cuántica no lineal. Para eludir las limitaciones debidas a la pequeña sección eficaz óptica de los átomos y el límite de difracción en el espacio libre, se han aplicado diferentes estrategias, entre ellas el uso de cavidades (CQED), de colectividades atómicas y, más recientemente, de nanoestructuras dieléctricas capaces de confinar la luz sin desenfocarse, permitiendo así la interacción con átomos atrapados en la proximidad de esas estructuras. Mientras que para el caso de la CQED se han desarrollado potentes herramientas teóricas para tratar las interacciones de los fotones, en el caso de colectividades atómicas hay una falta general de métodos teóricos más allá del régimen lineal. Esta relativa falta de comprensión también implica que podría haber nuevos fenómenos físicos interesantes que hasta ahora no se han identificado. El objetivo general de esta tesis es explorar estos temas con mayor detalle. En el capítulo 2 de esta tesis desarrollamos un nuevo formalismo para calcular las propiedades de la luz cuántica cuando interactúa con sistemas atómicos. El método consiste en utilizar un"`modelo de espines" que mapea un problema de propagación de luz cuasi unidimensional (1D) a la dinámica de un sistema abierto unidimensional de espines que interactúan entre sí, donde todas las correlaciones de fotones se obtienen a partir de las de los espines. La dinámica de los espines se puede resolver numéricamente utilizando la caja de herramientas de los estados producto de matrices (MPS), proporcionando así una técnica para estudiar los fotones que interactúan fuertemente en el regimen de la física de muchos cuerpos. En el capítulo 3 se investiga la posibilidad de crear fases exóticas de la materia utilizando la interfaz entre guía de ondas de cristales fotónicos (PCW) y átomos recientemente realizada experimentalmente, donde los modos de la banda de frecuencias prohibidas de la PCW se utilizan para mediar las interacciones de largo alcance entre los átomos. Encontramos un rico diagrama de fases de órdenes emergentes. En el capítulo 4 se investiga la posibilidad de implementar procesos ópticos cuánticos no lineales de segundo orden con nano-estructuras de grafeno, como una alternativa más robusta al uso de sistemas atómicos. Cuantificamos las propiedades no lineales de segundo orden, mostrando que el estrecho confinamiento da lugar a extraordinarias fuerzas de interacción a nivel de un solo fotón y predecimos que un diseño apropiado de las nano-estructuras del grafeno permitiría generar el segundo armónico con una eficiencia comparable a la de los cristales no lineales de última generación. En el capítulo 5, investigamos cómo la emisión cooperativa en memorias cuánticas realizadas con reticulos atómicos afecta su eficiencia, encontrando el impresionante resultado de que una memoria realizada con 16 átomos puede tener la misma eficiencia que un gas cuántico atómico de profundidad óptica mayor que 100.
Mulansky, Mario. "Chaotic diffusion in nonlinear Hamiltonian systems." Phd thesis, Universität Potsdam, 2012. http://opus.kobv.de/ubp/volltexte/2013/6318/.
Full textDiese Arbeit beschäftigt sich mit dem Phänomen der Diffusion in nichtlinearen Systemen. Unter Diffusion versteht man normalerweise die zufallsmäss ige Bewegung von Partikeln durch den stochastischen Einfluss einer thermodynamisch beschreibbaren Umgebung. Dieser Prozess ist mathematisch beschrieben durch die Diffusionsgleichung. In dieser Arbeit werden jedoch abgeschlossene Systeme ohne Einfluss der Umgebung betrachtet. Dennoch wird eine Art von Diffusion, üblicherweise bezeichnet als Subdiffusion, beobachtet. Die Ursache dafür liegt im chaotischen Verhalten des Systems. Vereinfacht gesagt, erzeugt das Chaos eine intrinsische Pseudo-Zufälligkeit, die zu einem gewissen Grad mit dem Einfluss einer thermodynamischen Umgebung vergleichbar ist und somit auch diffusives Verhalten provoziert. Zur quantitativen Beschreibung dieses subdiffusiven Prozesses wird eine Verallgemeinerung der Diffusionsgleichung herangezogen, die Nichtlineare Diffusionsgleichung. Desweiteren wird die mikroskopische Dynamik des Systems mit analytischen Methoden untersucht, und Schlussfolgerungen für den makroskopischen Diffusionsprozess abgeleitet. Die Technik der Verbindung von mikroskopischer Dynamik und makroskopischen Beobachtungen, die in dieser Arbeit entwickelt wird und detailliert beschrieben ist, führt zu einem tieferen Verständnis von hochdimensionalen chaotischen Systemen. Die mit mathematischen Mitteln abgeleiteten Ergebnisse sind darüber hinaus durch ausführliche Simulationen verifiziert, welche teilweise auf einem der leistungsfähigsten Supercomputer Europas durchgeführt wurden, dem sp6 in Bologna, Italien. Desweiteren können die in dieser Arbeit vorgestellten Erkenntnisse und Techniken mit Sicherheit auch in anderen Fällen bei der Untersuchung chaotischer Systeme Anwendung finden.
Lemch, Ekaterina S. "Nonlinear and hierarchical hybrid control systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0032/NQ64600.pdf.
Full textRaj, Ashish. "Evolutionary Optimization Algorithms for Nonlinear Systems." DigitalCommons@USU, 2013. http://digitalcommons.usu.edu/etd/1520.
Full textChryssochoos, Ioannis. "Optimization based control of nonlinear systems." Thesis, Imperial College London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399165.
Full textMathew, Michael Ian. "Design of nonlinear sampled-data systems." Thesis, Coventry University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.480606.
Full textBlake, Iain M. "Conjugated porphyrin systems for nonlinear optics." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365889.
Full textSzpruch, Lukasz. "Numerical approximations of nonlinear stochastic systems." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=14439.
Full textSincock, Paul. "Nonlinear compliant systems in irregular seas." Thesis, University College London (University of London), 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490146.
Full text