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 46 for “"Non linear behavior"”.
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Non-linear behavior of steel frames.
Massachusetts Institute of Technology. Dept. of Civil Engineering. Thesis. 1973. Ph.D.
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Um método interativo para análise de não-linearidade geométrica em estruturas reticulares
… and space framed structures taking into account non-linear behavior. Two effects are included in the analysis: the axial forces on the member stiffness matrix and the changes of geometry caused by large displacements. A computer program writed in FORTRAN II is presented and numerical examples are …
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Investigation of the Body Segment Inertial Properties and Long Bone Geometries of a Mid-Sized Male Finite Element Model
… of handling complex geometries and modeling the non-linear behavior of tissues.[14, 15]
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Simulação de escavação escorada por meio de elementos isoparamétricos
… are discussed, taking into account the non-linear behavior of soil, the possibility of supporting structures and effects due temperature variations. An incremental analysis is made, which is able to simulate any construction sequence. The isoparametric quadratic element used confers …
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Análise de grandes deformações e plasticidade por meio de elementos finitos isoparamétricos
Through the finite element method, the non-linear behavior of problems involving large deformation and plasticity is analysed. Both for Lagrangian and Eulerian formulation, the continuous is approximated by quadratic isoparametric elements, and the analysis of plane stress, plane strain and …
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Shear modulus relaxation of bulk metallic glass, Pd₄₀Ni₄₀P₂₀, near the glass temperature
The non-exponential and non-linear behavior of relaxing glasses below the glass temperature, Tg, is a well known and poorly understood phenomena that is the subject of much experimental and theoretical effort. The Interstitialcy Theory, which describes glasses as perfect crystals with a few percent …
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Redistribuição de momentos fletores em estruturas hiperestáticas
… between the points of null bending moment. The behavior of the statically indeterminate beams showed a perfect adaptation of these beams to the adopted bending moment diagrams. Considerations are made about different existing methods of calculating the rotation capacity of reinforced concrete …
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Phenomenological Study of Enthalpy Relaxation and Physical Aging of Glucose, Fructose and Their Mixture
… system produced ""stronger"" liquids, but less non-linear behavior. The change in the parameters x and beta with the thermal history (i.e., aging time, aging temperature and cooling-heating rates indicated the failure of the original assumption of the models for the sugar systems."
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Nonlinear ultrasonic guided waves for quantitative life prediction of structures with complex geometries
… Accumulation of these nascent cracks leads to non-linear elastic response of the material. These non-linearities can be detected from harmonic generation for propagating elastic waves. The long term goal of this study is to investigate the non-linear elastic propagation in parts with complex …
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Neural Network Models for Generating Synthetic Flight Data
… simulations, may fail to fully capture all non-linear behavior. While flight tests will always be required, a method for augmenting an existing database of flight test data with synthetically generated data could help alleviate some of the aforementioned challenges. Over the past few …
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On the strength and DSM design of end-bolted cold-formed steel columns buckling in distortional modes
Reports an experimental investigation on the behavior and ultimate strength of end-bolted cold-formed steel lipped channel columns selected to fail in distortional modes. Besides describing the test set-up and procedure, the available results are presented and discussed: they concern three tests …
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Shake table experiments for the determination of the seismic response of jumbo container cranes
… their importance to port operations, the seismic behavior of cranes has been largely ignored. Since the 1960s, industry experts have recommended allowing cranes to uplift, believing that it would limit the amount of seismic loading. However, modern cranes have become larger and more stable, and …
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Some numerical investigations in cosmology
… indispensable tool for understanding the complex non-linear behavior of many physical systems. Here we present two numerical investigations in cosmology. The first is posed in the context of inhomogeneous solutions to General Relativity. We lay out formalism for calculating observables in an …
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Creazione e sviluppo di un sistema di controllo in tempo reale per un sistema fuel cell
… the complicated process. Highly dynamic and non linear behavior, increase drastically the difficulties to find the optimal design and control strategies. The objective is to design, implement and commission a controller for the entire fuel cell system. The fuel cell process and the control …
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Evaluation of Hybrid-Composite Beam for Use in Tide Mill Bridge
… within a Fiber-Reinforced Polymer (FRP) box. Behavior in individual HCB's and a three HCB-system was examined to determine the appropriateness of the current design methodology developed by John Hillman and the simplifying assumptions made within it. Such assumptions include strain …
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The mechanical behavior of heavily overconsolidated resedimented Boston Blue Clay
… This thesis investigates the mechanical behavior heavily overconsolidated Resedimented Boston Blue Clay (RBBC), as an analog test material. The uniformity, reproducibility, and extensive knowledgebase on this clay permit the investigation of only the effect of overconsolidation. A series …
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Verification of a six-degree of freedom simulation model for the REMUS autonomous underwater vehicle
… and verification of a six degree of freedom, non-linear simulation model for the REMUS vehicle, the first such model for this platform. In this model, the external forces and moments resulting from hydrostatics, hydrodynamic lift and drag, added mass, and the control inputs of the vehicle …
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ALE and CEL formulations of pile installation in sand
… factors including large soil deformation, non-linear behavior of soil, the potential influence of pore water, and high computation cost. This work presents a a sophisticated numerical model which addresses the aforementioned aspects. A key feature of the numerical model is the capability to …
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Verification of a six-degree of freedom simulation model for the REMUS autonomous underwater vehicle
… and verification of a six degree of freedom, non-linear simulation model for the REMUS vehicle, the first such model for this platform. In this model, the external forces and moments resulting from hydrostatics, hydrodynamic lift and drag, added mass, and the control inputs of the vehicle …
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A Genetic Algorithm Framework using Variable Length Chromosomes for Vehicle Maneuver Planning
… generates Pareto optimal sets of maneuvers using non-dominated sorting genetic algorithm II (NSGA-II). The use of VLC removes the necessity for a human designer to impose a priori assumptions on the number and/or timing of vehicle maneuvers. Instead, the optimizer is freed to grow or reduce the …
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