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 51 for “"Large displacement"”.
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Large-Displacement Linear-Motion Compliant Mechanisms
… have generally been developed for small displacement applications. The objective of the thesis is to provide a basis for improved large-displacement linear-motion compliant mechanisms (LLCMs). One of the challenges in developing large-displacement compliant mechanisms is the apparent …
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Large displacement fast conducting polymer actuators
… Small strains can be amplified to produce large bending displacements by configuring the conducting polymer film in a trilayer configuration with two conducting polymer films sandwiching an electrolyte gel layer. This thesis focuses on the development of conducting polymer bending actuators …
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Visco-Elastic Nonlinear Constitutive Model for the Large Displacement Analysis of Multibody Systems.
… Nonlinear Constitutive Model for the Large Displacement Analysis of Multibody Systems.
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Development of a large displacement flexure based nano-precision XY positioning stage for vacuum environments
… or higher in this research. It is believed that large motion flexure based XY stages can be a cost-effective solution for semiconductor applications, particularly the ones that operate in vacuum. The use of air bearings in vacuum leads to complicated designs making flexures attractive. Flexures …
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Non-rigid registration of mammogram images using large displacement optical flow with extended flexibility for manual interventions
This thesis presents a registration method for mammogram images with extended flexibility for manual inputs from medical specialists. The algorithm was developed as part of the Mammography project led by Professor. Regina Barzilay at MIT CSAIL. Given a sequence of mammogram images, the algorithm …
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Structural Design of a Crashworthy Energy Absorbing Passenger Seat For a Large Transport Aircraft Using Large Displacement, Nonlinear Material Finite Element Analysis
<p>Federal Aviation Regulations certification criteria for transport aircraft seats require performing dynamic tests using anthropomorphic test dummies. Floor decelerations of the tests are 16g forward with the seat tracks misaligned by up to 10 degrees and 14g downward at a pitch angle of 30 …
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Algoritmos de relaxação dinâmica adaptativa para a análise elastoplástica de estruturas tridimensionais
… non-linear analysis, considering plasticity and large displacement effects. Finally sorne examples of application are given to show the performance of the suggested algorithms.
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Geometrically nonlinear finite element analysis of space frames
The displacement method of the finite element is adopted. Both the updated Lagrangian formulation and total Lagrangian formulation of a three-dimensional beam element is employed for large displacement and large rotation, but small strain analysis. A beam-column element or finite element can be …
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Feedback Control of Ionic Polymer Actuators
… both sides. An ionic polymer actuator undergoes large deformation in the presence of low applied voltage across its thickness and exhibits low impedance. They can also be used as large displacement sensors by bending them to induce stresses and generate a voltage response. They operate best in a …
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Análise estática não-linear de estruturas marítimas estaiadas em microcomputadores
… using an updated Lagrangean formulation for large displacement analysis. Geometrical and material non-linearities may also be considered for space frame elements. The material non-linearity is due to an explicit elastic-plastic stiffness matrix, which is based on the plastic theory of beams …
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A novel direct shear apparatus to evaluate internal shear strength of geosynthetic clay liners for mining applications
… 300-mm-square and 150-mm-square specimens under displacement-controlled conditions. Experiments were conducted on 150-mm-square and 300-mm-square GCL specimens to (i) evaluate gripping surface effectiveness as a function of peel strength and normal stress, (ii) assess hydration procedures to …
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The tectonic relationships of the Hillabee Chlorite Schist and the adjacent rock units in southern Cleburne County, Alabama
… two defined litho-tectonic blocks separated by a large displacement thrust fault. The Talladega block is composed of low grade metamorphic rocks. Sericite Phyllites and Quartzites are the main composition units. Metamorphic and tectonic events have created four defined structural events that are …
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EXTREME VERTICAL DISPLACEMENT, HIGH FORCE, SILICON MICROSTAGE ZIPPER ACTUATORS
Large vertical deflection, high force microactuators are desired in MEMS for a variety of applications. This thesis details a novel large-displacement electrostatic "zipper" microactuator capable of achieving hundreds of microns of out-of-plane deflection and delivering high forces, fabricated …
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Electrostatic zipping actuators and their applications to MEMS
… the challenge of providing both high force and large displacement, electrostatic zipping actuators have been developed and applied to various devices. As device thicknesses increase, however, conventional laterally- moving zipping actuators become less practical due to their high pull-in …
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Finite element analysis of elastic-plastic anisotropic soils
… models are implemented. An updated Lagrangian large displacement analysis is also included. The constitutive models developed are used to investigate the influence of initial anisotropy on the bearing capacity, deformation and pore pressure development under footings in both plane-strain and …
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Progressive Collapse Assessment of Steel and Concrete Composite Structures Subjected to Extreme Loading Conditions
… the response of flat concrete slabs subjected to large displacement are reported in this dissertation. Furthermore, important design hints for composite buildings are proposed. The starting point of the research is an experimental campaign conducted at the University of Trento. Two tests on 3D …
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Large-strain piezoelectric actuators using controlled structural buckling
… can be a useful mechanism for gaining extremely large displacement amplification, since a infinitesimal displacement in the axial direction of the beam may lead to a large deflection in the middle of the beam. This thesis presents a novel large-strain piezoelectric actuator exploiting the …
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