oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
On the Deflection of Rectangular Plane Plates  [PDF]
Florin Varlam
Bulletin of the Polytechnic Institute of Jassy, Constructions, Architechture Section , 2004,
Abstract: An accurate calculus is presented for the deflection coefficient of rectangular plates when they are loaded on two of their sides, for various cases of loading, from pure bending to uniform compression and for various rations of the plates sides, as well as a comparison of these values with those calculated using the relations found in SR 1911-98.
Optimal Design of Heatsink for 3 Phase Voltage Source Inverter System by Using Average Method  [cached]
S.E. Cho,S.J. Park
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n2p114
Abstract: In this paper, to study the heat transfer characteristics of conduction, convection, radiation for heatsink, we considered the heat transfer characteristics of power electronics(IGBT). To confirm the power loss of power electronics, we analyzed relationship between the profile current ,varies according to the time and the average current of the profile. By this analysis, we proposed the heatsink model of optimization for temperature rise. Also, we varified that the temperature rise of heatsink is same in the profile current ,varies according to the time as well as in the average current of the profile. Furthermore, we resulted that the time response and heat resistor for heat sink is stable according to the heatsink's volume.
Observability of rectangular membranes and plates on small sets  [PDF]
Vilmos Komornik,Paola Loreti
Mathematics , 2013,
Abstract: Since the works of Haraux and Jaffard we know that rectangular plates may be observed by subregions not satisfying the geometrical control condition. We improve these results by observing only on an arbitrarily short segment inside the domain. The estimates may be strengthened by observing on several well-chosen segments. In the second part of the paper we establish various observability theorems for rectangular membranes by applying Mehrenberger's recent generalization of Ingham's theorem.
Uniformly Loaded Rectangular Thin Plates with Symmetrical Boundary Conditions  [PDF]
Milan Batista
Physics , 2010,
Abstract: In the article the Fourier series analytical solutions of uniformly loaded rectangular thin plates with symmetrical boundary conditions are considered. For all the cases the numerical values are tabulated.
Investigation of Buckling under Periodic and Uniform Loads in Rectangular Plates  [cached]
Vahid Monfared
Research Journal of Applied Sciences, Engineering and Technology , 2012,
Abstract: In this research, local elastic buckling of the plates is studied with different boundary conditions under periodic and uniform compressive loadings by analytical direct method (Equivalency in Partial Differential Equation: EPDE) and FEM modeling in rectangular plates. Also, new formulations are presented for determination of critical buckling loads under uniform loading in rectangular plates. In this study, governing differential equation is used for thin plates under lateral and direct periodic and loadings. Next, the mentioned equation would be solved by assumed displacements by direct smart method. Therefore, the minimum critical buckling load is obtained for first mode of buckling by theoretical and finite element methods. These analytical results are validated by the FEM modeling. Finally, good agreements are found between the analytical and numerical predictions for the critical buckling loads.
Coupled integral equations for uniformly loaded rectangular plates resting on unilateral supports  [PDF]
P. Kongtong,D. Sukawat
International Journal of Mathematical Analysis , 2013,
Abstract: The present paper deals with the integral equations formulation throughthe method of finite Hankel integral transform techniques for solving the mixedboundary value problem of unilaterally supported rectangular plates loadedby uniformly distributed load. Due to the absent concentrated corner forcesat all plate corners, the occurrence of mixed boundary conditions betweena plate and the supports can be reduced from the coupled dual-series equationsthat resulted in using the Levy’s approach for the plate deflection functionto a set of two coupled integral equations of Fredholm-type. The highlight ofproblem is that the analyticalformulation explicitly considers the nature ofthe inverse-square-root shear singularities at the ends of unilateral supportsin the plate loaded state.
Natural frequencies of thin rectangular plates with partial intermediate supports
Escalante,M.R.; Rosales,M.B.; Filipich,C.P.;
Latin American applied research , 2004,
Abstract: in the present study, a methodology to find natural frequencies with arbitrary precision of thin rectangular plates on linear intermediate supports and mixed boundary conditions is presented. this means that the edges are total or partially supported, clamped or free, or any combination of these. the layout, number and place of linear intermediate supports are arbitrary, which allows for the analysis of a wide range of cases that include intermediate supports of different kinds: simple and multiple, straight and curved, complete (the ends coincide with the plate edges) and partial (at least one of the ends is not coincident with the plate edges). in the case of curved linear supports, the curve can be open or closed. the generalized solution is obtained using the whole element method. a continuous and a discrete model of equidistant points are studied both for intermediate supports and clamped edges. in all cases, both a systematic approach to the solution and the theoretical basis, which ensures the arbitrary precision of the results, should be emphasized. in order to illustrate the accuracy and efficiency of the method described, numerical results are presented for several problems and comparison is made with previously published results in some cases and in some others with the finite element method. these numerical results may be of interest to design engineers and researchers who conduct vibration studies.
PREDICTION OF DYNAMIC RESPONSE OF STIFFENED RECTANGULAR PLATES USING HYBRID FORMULATION
SHAHIN NAYYERI AMIRI,ASAD ESMAEILY
Journal of Engineering Science and Technology , 2010,
Abstract: A developed method, based on the varitional principles in combination with the finite difference technique, is applied to determine the dynamic characteristics of rectangular panels having stiffeners in both directions. The strain and kinetic energy for the plate and stiffener are expressed in terms of discrete displacement components using the finite difference method. Harmonic motion is assumed in order to eliminate the time dependency and exclude the transient response. The functional is minimized with respect to the discretised displacement components and the natural frequencies; and corresponding mode shapes are obtained from the solution of a linear eigenvalue problem. The natural frequencies and mode shapes of stiffened panels are determined for various boundary conditions. The results are included for a number of stiffened plates where the dimensions of the plate and stiffener cross section are chosen so that the mass of the plate-stiffener combination remains constant. The energy approach using the variational procedure yields acceptable results for the type of stiffened plates considered in this study. The results show that the natural frequencies can be increased by increasing the flexural rigidity of the stiffeners, and also the frequencies of two modes can be close or even be equal to the exact solution for a given size of stiffener.
Natural frequencies of thin rectangular plates with partial intermediate supports
M.R. Escalante,M.B. Rosales,C.P. Filipich
Latin American applied research , 2004,
Abstract: In the present study, a methodology to find natural frequencies with arbitrary precision of thin rectangular plates on linear intermediate supports and mixed boundary conditions is presented. This means that the edges are total or partially supported, clamped or free, or any combination of these. The layout, number and place of linear intermediate supports are arbitrary, which allows for the analysis of a wide range of cases that include intermediate supports of different kinds: simple and multiple, straight and curved, complete (the ends coincide with the plate edges) and partial (at least one of the ends is not coincident with the plate edges). In the case of curved linear supports, the curve can be open or closed. The generalized solution is obtained using the Whole Element Method. A continuous and a discrete model of equidistant points are studied both for intermediate supports and clamped edges. In all cases, both a systematic approach to the solution and the theoretical basis, which ensures the arbitrary precision of the results, should be emphasized. In order to illustrate the accuracy and efficiency of the method described, numerical results are presented for several problems and comparison is made with previously published results in some cases and in some others with the Finite Element Method. These numerical results may be of interest to design engineers and researchers who conduct vibration studies.
Analysis of natural in-plane vibration of rectangular plates using homotopy perturbation approach  [PDF]
Igor V. Andrianov,Jan Awrejcewicz,Vladimir Chernetskyy
Mathematical Problems in Engineering , 2006, DOI: 10.1155/mpe/2006/20598
Abstract: An analytical solution of the problem of free in-plane vibration of rectangular plates with complicated boundary conditions is proposed.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.