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 21 for “"Curved beam"”.
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Curved Beam Theory Applied to Opening Design
Made available in DSpace on 2014-12-10T17:57:38Z (GMT). No. of bitstreams: 1 6408344.pdf: 5451738 bytes, checksum: ef2696f2d786cca6e7aaf75e5f174df6 (MD5) Previous issue date: 1964
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A Geometrically nonlinear curved beam theory and its finite element formulation
This thesis presents a geometrically exact curved beam theory, with the assumption that the cross-section remains rigid, and its finite element formulation/implementation. The theory provides a theoretical view and an exact and efficient means to handle a large range of nonlinear beam problems. A …
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Curved beam based model for piston-ring designs in internal combustion engines
… and conformability. This study based on straight beam model was already developed but does not consider the lubrication sub-models, the tip gap effects and the characterization of the ring free shape based on any final closed shape. In this work, three numerical curved beam based models were …
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An investigation of the effects of curvatures on natural vibration characteristics of curved beams and plates
Curved structures are mostly investigated through the numerical method. In the numerical model, the curved beam or plate is easily simulated by assembled elements. Although the approximate solution can be obtained, numerical results are inadequate to demonstrate the effect of the curvature on the …
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A small strain, large rotation theory and finite element formulation of thin curved beams
… for the geometrically nonlinear analysis of thin curved beam-type structures is proposed and an associated displacement finite element formulation developed. An exact two-dimensional large rotation theory, which is based on an intrinsic coordinate system, has been developed. Four alternative …
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Graphs and tables for the analysis and design of curved concrete beams
… and at any intermediate point along a circularly curved beam. The investigation includes both cantilever beams and fixed ends beams, loaded with a uniformly distributed load, concentrated loads or a combination of the two. The solutions of the equations have been presented in a graphical form for …
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Control of a Beam and Ball System with Arbitrarily Shaped Smooth Beams
… model for the problem of controlling a ball on a curved beam for any beam defined by y = f(x). The model is converted to dimensionless parameters and simulated. The performance of LQR with a model for the motor in the controls lab at the University of Maryland College Park is studied and a …
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Spectral Element Analysis of Bars, Beams, and Levy Plates
… and a four DOF spectral Timoshenko beam element are also developed to gain insight into the performance of spectral elements. A cantilever beam example is used to show how incorporating eigenfunctions for the dynamic governing PDE into the displacement field enables spectral beam …
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Combined linear/nonlinear stability analysis of plane and space frames
… element in ABAQUS is capable of modeling the curved beam. The modeling procedure of the dome cap model is discussed. Finally, conclusions and recommendations are made for future studies.
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A multi-scale model integrating both global ring pack behavior and local oil transport in internal combustion engines
… at ring-groove and ring-liner interfaces. A curved beam finite element method was adopted to calculate the ring structural response to interaction between the ring and the liner as well as the ring and the groove. Compared to a traditional straight beam finite element method, the curved beam …
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Intricate dynamics and hydrodynamic frictional losses of the piston-ring assembly in internal combustion engines
… ring-pack using a multi-body dynamic approach. Curved beam Finite Element method for Timoshenko beams was used to account for the longitudinal and in-plane transverse deformations of the rings. Furthermore, the interaction between piston skirt, ring running surface, and the lubricating oil film …
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An incremental total Lagrangian formulation for general anisotropic shell-type structures
… i.e. degenerated shell element, degenerated curved beam element, 3-D continuum element and solid-shell transition element, are developed for the geometric nonlinear analysis of general shell-type structures, anisotropic as well as isotropic. Compatibility and completeness requirements are …
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Static and free-vibrational response of semi-circular graphite- epoxy frames with thin-walled open sections
… was developed specifically for the analysis of curved, thin-walled structures. The formulation of the element is based on a Vlaysov-type, thin-walled, curved beam theory. The predictions from the finite element program generally correlated well with the experimental data for the symmetric …
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The control of flexible structure vibrations using a cantilevered adaptive truss
… the system. Three of these structures; a slender beam, a single curved beam, and two curved beams are controlled both in simulation and with an experimental test article. The test article, comprised of the flexible structure, the adaptive truss, and the actuators shows excellent agreement between …
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Ruga mechanics of composite media with soft inclusions
… to follow the same post- buckling behavior as a beam on an elastic foundation, through a semi-analytical approach, it is shown that an unstable post-bifurcation response emerges. Additionally, using numerical analysis, careful patterning of the inclusions is shown to induce complex surface …
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An electrothermally-actuated bistable MEMS relay for power applications
… bistable mechanism comprises two parallel cosine curved clamped-clamped beams that are also clamped together at their centers. If designed properly it exhibits a second stable deflected shape that is nearly a mirror image of its as-fabricated shape mirrored through the centerline connecting its …
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Mathematical modelling of asymmetrical metal rolling processes
… with further refinement. Finally, coupling a curved beam model with a curvature predicting rolling model is proposed to model the ring rolling process. Both of these parts are implemented but convergence between them is not yet achieved. By analogy this could be extended with shell theory and …
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Three-dimensional polymeric capillary network: fabrication and applications
… control of surface-oriented swelling in a curved polymeric beam, which also affected its bending direction. Compared with traditional silicon MEMS devices, using this method we achieved much higher actuation displacement with respect to the length of the beam without sacrificing the …
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A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines
… sealing performance. To do so a multi-scale curved beam finite element model of piston ring is developed. It is built to couple ring deformation, dynamics and contact with the piston and the cylinder. Oil flow at the interfaces between the ring and the cylinder liner and between the ring and …
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Inverse Problems in Structural Mechanics
… for geometrically linear and nonlinear FEMs of beams or frames by using a four-noded curved beam element, which, for a given precision, may significantly solve the ill-posed problem by reducing the overall number of degrees of freedom (DOF) of the system, especially the number of the unknown …
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