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Showing 1 to 20 of 33 for “"Beam structures"”.
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On the buckling finite element analysis of beam structures
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2002.
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Optimization of composite box-beam structures including effects of subcomponent interaction
… mass designs are obtained for a simple box beam structure subject to bending, torque and combined bending/torque load cases. These designs are obtained subject to point strain and linear buckling constraints. The present work differs from previous efforts in that special attention is payed …
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Numerical Modeling and Analysis of Composite Beam Structures Subjected to Torsional Loading
… solve the torsion problem of laminated composite beams. Instead of following the classical Saint Venant theory formulation, the notion of effective elastic constant is utilized. This approach uses the concept of elastic constants, and in this context the three-dimensional non-homogeneous …
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Shear strength of reinforced concrete wall-beam structures: upper- bound analysis and experiments
… failure in reinforced concrete (R. C.) wall-beam type structures when subjected to in-plane loading. The upper-bound approach is emphasised. Present shear design practice (e.g. BS8110:1985) relies much upon empirical solutions, but it is inadequately Substantiated by theoretical analyses when …
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Modeling and response analysis of thin-walled beam structures constructed of advanced composite materials
Thin-walled beam structures are adopted as structural members in various fields of modem technology including aeronautical/aerospacial, naval, mechanical and civil ones. With the advent of advanced composite material systems, there is a vital need to reformulate the classical theory of thin-walled …
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Characterization of laser noise in free-free beam structures using a Scanning Laser Doppler Vibrometer
… to measure the dynamic response of vibrating structures. Essential in the optimal use of such a device is an understanding of the idiosyncrasies and operating parameters which may affect the quality of the experimental data. Specifically, the quality of the data taken with an SLDV system may …
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Extraction of eigen-pairs from beam structures using an exact element based on a continuum formulation and the finite element method
… structure eigenvalues and eigenvectors. An exact beam-element dynamic-stiffness formulation is presented for a plane Timoshenko beam with rotatory inertia. This formulation is based on a converted continuum transfer matrix and is incorporated into a typical finite element program for …
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Aspects of vibration in bridge-girders
… of cantilevers, simply supported and continuous beam structures. Different methods are used, such as classical, energy and matrix methods. Effects of mass lumpings are investigated. A literature review is given for the general problem of dynamic behaviour of highway bridges, including the passage …
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A micromachined silicon vibrating-beam angular rate sensor : a design and implementation study
Design and Implementation of a Silicon-Beam Angular Rate Sensor is studied. The sensing device is designed based on a micromachined single crystal silicon beam. Electromagnetic actuation supplies the reference vibration, and the Coriolis-induced vibration is sensed by a capacitor plate in close …
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Study of Condition Monitoring of Bridges Using Genetic Algorithms
… detailed level defined as the fracture damage in beam structures are successfully determined.
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Finite Element Simulation Of Repair Of Delaminated Composite Structures Using Piezoelectric Layers
… aeronautical, mechanical, civil and offshore structures often results from factors such as fatigue, corrosion and accidents. Such damage when left unattended can grow at an alarming rate due to the singularity of the stress and strain in the vicinity of the damage. It can lead to increase in …
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A computer implementation of the static and dynamic analysis of induced strain actuated beams
… and dynamic analysis of induced strain actuated beam structures. A PC-based, user-friendly, menu-driven software program DAISA (Dynamic Analysis of Induced Strain Actuated Beams) has been developed for the analysis of structural response due to induced strain actuation, with a highly …
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Parametric vibration of composite beams with integrated shape memory alloy elements
… concerned with parametric vibration in composite beam structures with shape memory alloy elements. As a precursor to this investigation, a flexible steel beam of rectangular uniform cross-section is considered with a lumped end mass under a parametric excitation. A single frequency harmonic …
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Nonlinear Finite Element Analysis of Laminated Composite Beams Subjected to Harmonic Excitations Using a 20 DOF Beam Element
… of antisymmetrically laminated composite beams including shear deformation subjected to harmonic excitation, using a 20-degree of freedom finite element beam. The beam has 10 degrees of freedom at each node: The axial displacements, the transverse deflection due to bending and transverse …
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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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Enhanced induced strain actuator performance through discrete attachment to structural elements
In intelligent structures, structural deformation is generally controlled by either embedding or surface bonding the induced strain actuator to the structure. With bonded or embedded actuators used for inducing flexure, the developed in-plane force contributes indirectly through a locally-generated …
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Energy-absorption capability of composite tubes and beams
… capability of composite subfloor beam structures. Before it is possible to develop such an analysis capability, an in-depth understanding of the crushing process of composite materials must be achieved. Many variables affect the crushing process of composite structures, such as the …
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Characterization of Bending Magnetostriction in Iron-Gallium Alloys for Nanowire Sensor Applications
… magnetostrictive transduction in bending beam structures, as this means of operation has been unattainable in previous materials research due to low tensile strengths in conventional alloys such as Terfenol-D. Results show that there is an appreciable sensing response from cantilevered …
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A micromachined magnetic field sensor for low power electronic compass applications
… disc, changing the effective stiffness of the beams and therefore the resonant frequency of the sensor. MEMS-based mechanically-resonant sensors, in which the sensor resonant frequency shifts in response to the measurand, are widely utilized. Such sensors are typically operated in their linear …
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