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 19 of 19 for “"Nonlinear Structures"”.
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Response of nonlinear structures to deterministic and random excitations
… methods are developed to study the response of nonlinear systems to combined deterministic and stochastic excitations. They are a second-order closure method, a generalized method of equivalent linearization, and a reduced non-Gaussian closure scheme. Primary resonances of single- and …
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Shape Sensitivity Analysis and Computer-Aided Design of Nonlinear Structures
A unified approach for explicit structural design sensitivity analysis of linear and non-linear elastic systems is presented. First-order sensitivity expressions involving the complete set of design variables, including shape design parameters, are derived for general response functionals. Both …
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Stochastic and seismic design response of linear and nonlinear structures
… and seismic design response of linear and nonlinear structures are presented. For linear structures, two approaches are developed: (1) the modified mode displacement approach for classically as well as non-classically damped structures, and (2) the generalized force derivative approach for …
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ON COMPUTATIONAL SYNTHESIS AND DYNAMIC ANALYSIS OF NONLINEAR RESONANT SYSTEMS WITH INTERNAL RESONANCES
This work is concerned with synthesis methods for nonlinear structures and the
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Gain scheduling for geometrically nonlinear flexible space structures
… approach for the control of geometrically nonlinear structures is developed. The objective is to improve performance over current linear design techniques that are applied to the same control problem. The approach is applicable to a variety of structures that have complex dynamics with slow …
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Contribuição ao estudo da identificação topológica de sistemas físicos dinâmicos não-lineares
… (with the aid of a digital simulation) of 24 nonlinear structures defined be the cascade association of linear stationary and first order blocks with nonlinear blocks employing a group of polarized relays. Hierarchized tests especially conceived for the study of internal and external …
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Performance of Nonlinear Mechanical, Resonant-Shunted Piezoelectric, and Electronic Vibration Absorbers for Multi-Degree-of-Freedom Structures
… Limited evaluation of the performance of nonlinear vibration absorbers for nonlinear structures exists in the current literature. The state of the art is extended in this work to vibration absorbers in their three major physical implementations: the mechanical vibration absorber, the …
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IMAGE-BASED MODELING AND PREDICTION OF NON-STATIONARY GROUND MOTIONS
Nonlinear dynamic analysis is a required step in seismic performance evaluation of many structures. Performing such an analysis requires input ground motions, which are often obtained through simulations, due to the lack of sufficient records representing a given scenario. As seismic ground motions …
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Nonlinear and non-modal stability of structures evolving in shear flows
… a range of stability techniques applied to fluid structures that develop in various constant density flows. In particular, the stability of nonlinear structures which develop in rotating plane Couette flow is analyzed using Floquet theory, which allows the global stability of an important …
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Parametric identification of nonlinear structural dynamic systems
… in past studies. Identification methods for nonlinear structures have also been introduced in previous articles, including procedures based on the method of multiple scales, iterative and noniterative direct methods, and state space mappings. Here, a procedure is introduced for the …
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Use of Response Surface Metamodels in Damage Identification of Dynamic Structures
… some degree of accuracy, for both linear and nonlinear systems. A very important characteristic of the RSMs developed in this thesis is that they require very little information about the system in order to generate relationships between damage indicators and measureable system responses for …
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Sound design for nonlinear artefacts: models for sound design in the transformation between linear and nonlinear artefacts.
… applied sound design for both linear and nonlinear artefacts, within the fields of fine art and urban design. It recounts the research, the concepts and the themes that inform the works in the portfolio. The main subject matter is the difference between linear and nonlinear artefacts and …
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Nonlinear analysis and control of chemical reactors
This thesis carries out a detailed study of a nonlinear spectral theory that is useful for modeling and controlling chemical reactors. The motivation for this work originates from a few reports which have demonstrated in the past that the nonlinear spectral method offers a useful mathematical …
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Asymptotic post-buckling analysis by Koiter's method with a general purpose finite element code
Many structures are sensitive to initial imperfections, sometimes leading to a great decrease in buckling load. Koiter showed that the effect of initial imperfections is largely determined by the initial post-buckling behavior of the perfect structure. The present work seeks to implement Koiter’s …
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Causal Structure Learning through Double Machine Learning
… iii) the number of potential underlying structures increases super-exponentially with the number of variables, posing significant statistical and computational challenges and iv) the identifiability problem arises because multiple causal models can yield the same observational …
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Analyzing the Effect of Moving Resonance on Seismic Response of Structures using Wavelet Transforms
Nonlinear structures, when subjected to multiple ground motion records that are scaled to consistent ground motion intensity show significant variation in their response. This effect of ground motion randomness on the variation of structural response is defined as Record-to-Record (RTR) …
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Determining the Influence of Experimental Setup and Inputs on Nonlinear Systems
… conditions. Due to the lack of understanding of nonlinear system dynamics, the components and structures have been over-designed to handle these environmental conditions and reduce nonlinear influences. Over-designing leads to an increase in weight, which in turn reduces fuel efficiency. In …
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Parametric and nonparametric identification of shell and tube heat exchanger mathematical model
… namely, multiple unknown parameters and highly nonlinear structures. Energy balances have been set-up for condition of unknown parameters which involved, among others, temperature, flow rate, density and heat capacity. The identification process produces a dynamic model of the heat exchanger …
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On the application of numerical continuation to large-scale dynamical systems
… in dealing with large groups of components with nonlinear interactions has received constantly growing attention in recent years in wide variety of applications from system biology to the size evolution of aerosol particles. These systems exhibit complex behaviors that are not predictable unless …