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 25 for “"nonlinear beam"”.
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Reliability-Based Design Optimization of Nonlinear Beam-Columns
… addresses the ultimate strength analysis of nonlinear beam-columns under axial compression, the sensitivity of the ultimate strength, structural optimization and reliability analysis using ultimate strength analysis, and Reliability-Based Design Optimization (RBDO) of the nonlinear …
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Nonlinear beam-based vibration energy harvesters and load cells
This thesis studies a novel nonlinear spring mechanism that is comprised of a cantilever wrapping around a curved surface as it deflects. Static force versus displacement tests and dynamic "initial displacement" tests verified the spring theory for a large range of oscillator parameters. Various …
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A theoretical and numerical evaluation of nonlinear beam elements
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1997.
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Iterative nonlinear beam propagation method and its application in nonlinear devices
In this thesis, an iterative nonlinear beam propagation method is introduced and applied to optical devices. This method is based on Hamiltonian ray tracing and the Wigner distribution function. First, wave propagation simulation using Hamiltonian ray tracing is illustrated and verified with …
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Random Vibration Analysis of Higher-Order Nonlinear Beams and Composite Plates with Applications of ARMA Models
… this work, the random vibration of higher-order nonlinear beams and composite plates subjected to stochastic loading is studied. The fourth-order nonlinear beam equation is examined to study the effect of rotary inertia and shear deformation on the root mean square values of displacement …
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Experiments and simulations of large-angle flexible beam control using an adaptive truss
… adaptive truss with an appended flexible beam. Three cases are studied. The first case is an experimental and analytical investigation of flexible beam control using an adaptive truss positioned in an equilibrium configuration such that the beam is parallel to the gravity field. A linear …
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Comparison of theory and experiment for flexural-torsional buckling of laminated composite columns
… experimental data. Also, a geometrically nonlinear beam column analysis by the finite element method is developed from the theory. Results from the nonlinear compression response analysis are compared to limited available test data. The merits of the theory and its implementation are …
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Inelastic Analysis of Reinforced Concrete Beams Subjected to Combined Axial Force, Bending and Torsion
… for rectangular, circular and slab sections. A nonlinear beam element which is based on the results from the space truss model is used in the analysis of grid structures on which torsion is known to be significant. By comparison with available experimental data as well as examination of the …
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Modeling beam-decking connectors under failure conditions
… structure incorporating material and geometric nonlinearities can be very time-consuming and expensive. For this reason, the purpose of this study is to determine to what degree the finite element model of the dome can be simplified and still yield useful results. The primary objective of this …
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Nonlinear 3-D beam/connector finite element with warping for a glulam dome
… with ABAQUS to include warping of rectangular beams, and to model the nonlinear beam/decking connectors (nails) of the dome in order to develop an effective finite element model of the glulam dome for investigating its ultimate load capacity. The shear modulus is modified to include warping of …
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Control-oriented modeling and adaptive parameter estimation of a lithium ion intercalation cell
… formulation (ANCF) proposed in [281 for nonlinear beam models. The ANCF model is shown to be accurate for currents up to 4C for a LiCoO2 /LiC6 cell. The afore mentioned extended adaptive observer is also applied to the ANCF model and parameters are shown to converge under conditions of …
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Development of Elastic Resistive Force Theory & Applications to Uprooting
… intruders) at once. By combining eRFT with a nonlinear beam theory to represent slender, inextensible roots we create a speedy computational tool. Using MATLAB, we simulate various uprooting scenarios to better understand anchoring mechanisms of different root geometries. We showcase the …
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Analytical Modeling of the Repair Impact-Damaged Prestressed Concrete Bridge Girders
… girder test and five repair method tests. Nonlinear beam models and three-dimensional finite element (FE) models were created to predict the behavior of the beams under flexural testing, and subsequently validated and calibrated to experimental test data. The very good accuracy of the beam …
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Dynamic delamination of patterned thin films
… a numerical scheme based on the combination of a nonlinear beam model to capture the elastodynamic response of the thin film and a cohesive failure model to simulate the interface. Numerical results are then validated with experimental measurements of the interface crack evolution history using …
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Numerical Analysis of Reinforced Masonry Shear Walls Using the Nonlinear Truss Approach
… uses an existing modeling method, based on nonlinear truss models, to simulate the behavior of fully grouted reinforced masonry shear walls. The modeling method, which was originally created and used for RC walls, is enhanced to capture the effect of localized sliding along the base of a …
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Ultimate Strength Analysis of Stiffened Panels Using a Beam-Column Method
An efficient beam-column approach, using an improved step-by-step numerical method, is developed in the current research for studying the ultimate strength problems of stiffened panels with two load cases: 1) under longitudinal compression, and 2) under transverse compression. Chapter 2 presents an …
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Simulation of the In-plane and Out-of-plane Seismic Performance of Nonstructural Partition Walls
… data is used to propose and calibrate analytical nonlinear material models for the connections in OpenSees. Subsequently, the connection models are employed to propose a novel detailed and yet computationally efficient modeling methodology for nonstructural partition walls. In this methodology, …
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Efficient and coherent frequency conversions and nonlinear interference in optical parametric and atomic Raman processes
… in quantum networks. ^ Coherent and efficient nonlinear interaction and frequency conversion are of great interest in many areas of quantum optics. Traditionally, the low efficiency of Raman scattering is improved by a high-finesse optical resonator or stimulated Raman conversion. It was …
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A study of blister tests for film adhesion measurement and fracture efficiency of tests for adhesive bonds
… cracked lap shear specimen using a geometrically nonlinear beam-column approach. Excellent agreement for energy release rates has been shown between the closed form solution and geometrically nonlinear finite element analyses. The study also discusses how to design a cracked lap shear specimen of …
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