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 32 for “"Nonlinear Modeling"”.
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Nonlinear Modeling of a Sustainable Material
This study developed a nonlinear constitutive model for a sustainable orthotropic material. Existing methods for constitutive models of wood were improved upon to include the nonlinear stress-strain response not only in the two orthogonal axes but at any orientation to the strong axis of the …
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Meandering rivers morphodynamics - integrating nonlinear modeling and remote sensing
… and temporally oscillating width accounting for nonlinear feedbacks in flow and sediment transport by means of a two-parameters perturbation approach. Application of the PyRIS software to several long reaches of free-flowing meandering rivers allows me to develop a consistent set of observations …
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Nonlinear modeling of time series prediction in the capital markets
Thesis (M.B.A.)--Massachusetts Institute of Technology, Sloan School of Management, 1995.
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Nonlinear modeling of high field ferroelectric ceramics for structural actuation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1994.
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Global Nonlinear Modeling Using Automated Local Model Networks in Real Time
Global nonlinear modeling is a challenging task that spans multiple disciplines. When it is necessary to develop a model across the global input space, and a single linear model is insufficient, nonlinear modeling methods are required. If the model is constrained to be developed autonomously in …
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Analysis of the cross-section of equity returns on the JSE Securities Exchange based on linear and nonlinear modeling techniques
… 1997 to 31 December 2007. Both linear and nonlinear expected returns forecasting models are constructed based on the cross-section of equity returns. A blended approach combining a linear modeling technique with a nonlinear artificial neural network technique is developed to identify future …
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Generalized Volterra-Wiener and surrogate data methods for complex time series analysis
… thesis describes the current state-of-the-art in nonlinear time series analysis, bringing together approaches from a broad range of disciplines including the non-linear dynamical systems, nonlinear modeling theory, time-series hypothesis testing, information theory, and self-similarity. We stress …
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An improved switching converter model
The nonlinear modeling and analysis of dc-dc converters in the continuous mode and discontinuous mode has been done by averaging and discrete-sampling techniques. The averaging technique is simple to use and averages the output voltage. The discrete technique is very complex and cumbersome, but …
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Nonlinear Approaches to Predicting Diameter of the Largest Limb at Breast Height in Young, Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) Plantations Growing in the Pacific Northwest
This study examined two nonlinear modeling methodologies to predict the diameter of the largest limb at breast height (DLLBH) in young, Douglas-fir (Pseudotsuga menziesii (Mirbel) Franco) plantations in the Pacific Northwest using a combined power exponential function. The first method examined …
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Large-signal characterization and modeling of nonlinear devices using scattering parameters
Characterization and modeling of devices at high drive levels often requires specialized equipment and measurement techniques. Many large-signal devices will never have traditional nonlinear models because model development is expensive and time-consuming. Due to the complexity of the device or the …
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Analysis of a Nonlinear vibration absorber for vibration control in a hand-held impact machine
… of these tools, this dissertation focuses on modeling their dynamic behavior to evaluate the effectiveness of vibration control strategies. The novelty of this work lies in the use of nonlinear mass– spring–damper models to describe tool dynamics, coupled with lumped-mass models of the …
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S-parameter modeling of two-port devices using a single, memoryless nonlinearity
It is proposed to represent a nonlinear two-port device by a scattering parameter (S-parameter) model containing a single nonlinearity. Furthermore, it is proposed that the nonlinearity be modeled as a memoryless nonlinear function. A bipolar junction transistor (BJT) operating in the active region …
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Double layer capacitors : automotive applications and modeling
This thesis documents the work on the modeling of double layer capacitors (DLCs) and the validation of the modeling procedure. Several experiments were conducted to subject the device under test to a variety of charging/discharging profile and temperatures in an effort to simulate the various …
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Explorations into Appendicular Ontogeny using a Cross-Sectional, Contemporary U.S. Sample
… have often resulted in limited or inappropriate modeling choices to investigate the growth and development and variation of the subadult skeleton. Recent technological advancements have made virtual anthropology possible. The use of computed tomography (CT) scans has opened the doors to …
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Identification of chemical species using artificial intelligence to interpret optical emission spectra
The nonlinear modeling capabilities of artificial neural networks (ANN’s) are renowned in the field of artificial intelligence (Al) for capturing knowledge that can be very difficult to understand otherwise. Their ability to be trained on representative data within a particular problem domain and …
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Cultivating Creativity in Aerospace Systems Engineering to Manage Complexity
… the inadequacy of linear methods when applied to nonlinear domains, i.e., oversimplification in a program amplifies the amount of risk produced when a system behaves unexpectedly. Effectively managing complexity involves responding to the various sources of complexity, whether it appears in the …
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Modeling and Approximation of Nonlinear Dynamics of Flapping Flight
… that this process generates a set of coupled nonlinear ordinary or partial differential equations. For this class of systems, the models derived from morphology of the skeleton are usually very high dimensional, nonlinear, and complex. This is particularly true if joint and link flexibility …
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Multifunction Radio Frequency System Design Using Nonlinear Models
… in the system were characterized using nonlinear models so that their harmonic behaviour could be accounted for. Wideband systems are particularly susceptible to harmonic interference since it is possible for harmonics to enter the large frequency window provided by the system, hence the …
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Modeling and Estimation of Linear and Nonlinear Piezoelectric Systems
… piezoelectric oscillator arrays, 2) studies of nonlinear piezoelectric oscillators. This dissertation derives novel linear and nonlinear modeling and estimation methods for such piezoelectric systems. In the first part, this work develops modeling and design methods for Piezoelectric Subordinate …
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