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 20 for “"Elastic Beam"”.
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Modeling of Transient Response of an Elastic Beam With Flexible Supports and Variable-Location Impact
… in space was undertaken; an euler-bernoulli beam with adjustable boundary conditions and variable impact is numerically studied under a pulse loading. Structural stiffness, material modulus, contact stiffness, contact location, damping ratio, pulse duration, clearance and boundary conditions …
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Análise dinâmica de vigas de pontes pelo método dos elementos finitos - aplicação a vigas Gerber
… is presented, being the bridge idealized as an elastic beam under the action of moving constant forces. Special emphasis is given to the dynamic behavior of cantilever bridges. The structure is discretized in finite elements and the analysis is conducted by means of the modal superposition …
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Dynamic Interactions Between Multidimensional Viscoelastic Joints and an Elastic Frame Structure
… elastomeric joints at the interfaces between elastic structures that balance the competing needs of ride and handling, durability, and vibration isolation for the next generation fuel efficient vehicles. A typical elastomeric joint is geometrically shaped to provide favorable properties in …
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Design and Analysis of End-Effector Systems for Scribing on Silicon
… using the pseudo-rigid-body model and linear-elastic beam method to determine the axial stiffness, finite element methods to determine the lateral stiffness, and fatigue analysis to determine mechanism cycle life. This thesis also investigates the significance of mechanical factors on the …
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Bridging Simple Models and Observations of the Flexure Zone around Antarctica
… the effective Young’s modulus using a 1-D linear elastic beam bending model. The ice flexure zone is defined as the transition region between the grounded ice sheet and the free floating ice shelves, where the ice flexes due to the rise and fall of ocean tides. Surface elevation data from ICESat-2 …
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Wave tailoring granular materials: effect of randomness and plane wave propagation
… study to investigate the vibration response of beams made of a granular chain embedded in a linear elastic matrix. A nonlinear, dynamic finite element model is developed, in which the granular chain is converted to a series of 1D nonlinear bar elements whose contribution is added to linear …
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AN EXPERIMENTAL AND NUMERICAL STUDY ON CAVITATION BUBBLE DYNAMICS AND ITS BIOMEDICAL APPLICATIONS
… A cavitation bubble collapse near a finite elastic beam, or a rigid wall with an attached hemispherical bubble, are experimentally investigated. A novel low-voltage spark discharge method is also developed, which is capable of generating consistent-sized cavitation bubbles. Numerical …
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The performance of high speed reciprocating polymer seals in water
… is based on a numerical algorithm in which the elasticity equations for the seal deflection and the one dimensional lubrication equation have been solved simultaneously. The polymeric ring has been simplified due to its axisymmetry, and modelled in cross section as an elastic beam resting on a …
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Theoretical analysis of bump and airblast events associated with coal mining under strong roofs
… longwall roofs. The roofs were modeled as elastic beams on continuous elastic foundations subject to exponentially distributed abutment stress. Elastic beam theory was applied to develop analytical solutions for deflection of single-layer roof models. Methods for analyzing double-layer roof …
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A Mathematical Analysis of Digestive Processes in a Model Stomach
… disturbances when the wall is modelled as an elastic beam or when we include a scalar material field that acts to alter the surface tension at the interface. An examination of Navier–Stokes flow of a single fluid through a diverging channel (representing a small strip through the centre of the …
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Numerical Modeling of Air Cushion Vehicle Flexible Seals
… successfully replicate benchmark results for an elastic beam in unsteady laminar flow. To validate the implementation as a seal parameter exploratory tool, a planer bow seal model is developed and results are obtained for various cushion pressures and inflow speeds. Previous numerical and …
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Stochastic analysis of structures made of composite materials
… to the material properties and the extreme aero-elastic loads based on experimental data as well as on 10 min load simulations respectively, (ii) the identification of the critical failure modes of the composite structure in terms of limit state functions and (iii) the selection of an appropriate …
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Three-dimensional routed manifolds with externally inserted cables
… ratios between 200:1 and 10:1. A perfectly elastic beam model is developed as well as an elastic-plastic beam model.
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Time-Domain Simulations of Aerodynamic Forces on Three-Dimensional Configurations, Unstable Aeroelastic Responses, and Control by Neural Network Systems
… and control systems, in the time domain. An elastic beam model coupled with rigid-body rotation is developed for the wing structure, and the natural frequencies and mode shapes are found by the finite-element method. A general unsteady vortex-lattice method is used to provide aerodynamic …
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Prediction of service load of concrete structures after cracking using ultrasonic technique
… utilized to detect crack propagation in notched beams of mortar, plain concrete and reinforced concrete. The study showed that crack growth and microcrack zone in cementitious composites can be quantitatively detected by the ultrasound technique. To predict crack propagation during the fracture …
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Dynamic Response of Linear/Nonlinear Laminated Structures Containing Piezoelectric Laminas
The three-dimensional linear theory of piezo-elasticity is used to analyse steady state vibrations of a simply supported rectangular laminated composite plate with piezoelectric (PZT) actuator and sensor patches either embedded in it or bonded to the its surfaces. It is assumed that different …
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Fluid flow measurement using electrical and optical fibre strain gauges.
… longitudinal surfaces of a square-sectioned, elastic, rubber cantilever having a drag element attached to its free end. An attempt has been made to optimise the shape and dimensions of the elastic beam to obtain a constant drag co-efficient over a wide flow range. Calibration of the electrical …
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Developing Innovative Technologies for Creating Realistic Animation of Digital Characters for Real-time Environments
… integrat- ing the governing equation of elastic beam deformation and Newton’s second law to reconstruct dynamic 3D models with high accuracy and reduced data volumes. This PDE-based approach offers a time-dependent so- lution for creating detailed deformable models, signifi- cantly …
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Structural behaviour of concrete segmental lining tunnels: towards design optimisation
… The solution developed for a sequential elastic rod subjected to a trilinear temperature profile and in shear interaction with the elastic ground predicts accurately the early tunnel pre-stressing relaxation caused by grout hardening, e.g. ≈50% in the CTT. The proposed sequential elastic …
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The post-breakup evolution of the western Indian high-elevation passive margin
… denudational unloading can be modelled as a thin elastic beam overlying a fluid substratum. Modelling the isostatic response of the Western Indian lithosphere to sediment loading offshore and denudation onshore infer that flexural isostasy is an important component in the development of the …