European Journal of Computational Mechanics最新文献_第10页

Vibration Based Damage Detection in Plate-Like Structure Using Square of Mode Shape Curvature 基于振型曲率平方的板状结构损伤检测

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-10-18 DOI: 10.13052/EJCM1958-5829.2841

Ramesh Lanka, P. S. Rao

{"title":"Vibration Based Damage Detection in Plate-Like Structure Using Square of Mode Shape Curvature","authors":"Ramesh Lanka, P. S. Rao","doi":"10.13052/EJCM1958-5829.2841","DOIUrl":"https://doi.org/10.13052/EJCM1958-5829.2841","url":null,"abstract":"In this current work, a new methodology based on the square of mode shape curvature (SMSC) is presented that relates the mode shapes and its curvature changes before and after the damage for localization and sizing of the surface crack in plate-type structures. The significance of this method is it has the capability to portray accurate shape and exact location of the surface crack in a plate-like structure which are related to low and high elastic modes on dense and coarse measurement grids. The efficiency of the proposed SMSC is examined using experimental and numerical data acquired from modal analysis on the aluminum plate containing single and multi-surface cracks with a fixed-free condition using non-contact measurement a scanning laser vibrometer and on simple finite element plate model. As evidence of experimental and numerical study results, highly accurate crack characterization has been attained through the proposed method. In implementing this method, only a few modes of the structure are required. Further, the impact of the mode order on the effectiveness of crack detection, boundary distortion treatment, and grid density analysis was also performed by the proposed method.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":"1 1","pages":""},"PeriodicalIF":1.2,"publicationDate":"2019-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43167330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A 6-parameter triangular flat shell element for nonlinear analysis 用于非线性分析的六参数三角形扁壳单元

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-09-11 DOI: 10.13052/ejcm1958-5829.2835

M. Rezaiee-Pajand, A. Masoodi, E. Arabi

{"title":"A 6-parameter triangular flat shell element for nonlinear analysis","authors":"M. Rezaiee-Pajand, A. Masoodi, E. Arabi","doi":"10.13052/ejcm1958-5829.2835","DOIUrl":"https://doi.org/10.13052/ejcm1958-5829.2835","url":null,"abstract":"In this paper, an improved flat triangular shell element is proposed. This element has three nodes, and in each node, six degrees of freedom are considered. Since there are three rotational degrees of freedom at each node, the drilling effect can be incorporated in authors' formulation. A new procedure is also suggested for updating the director vectors about which the rotational degrees of freedom are defined. In order to study large displacements and rotations, Total Lagrangian principles are employed. In addition, updating the rotational degrees of freedom is implemented using enriched updated director vectors, which are formulated based on the finite rotation method. On the other hand, small strains are considered in this formulation. By utilizing MITC method, shear and membrane locking is mitigated from new element. To examine the performance, the element passes three basic tests, including isotropy, and patch test. Moreover, a convergence study is also implemented to show the elemental behavior. Several popular benchmarks are considered to illustrate the accuracy and capability of the suggested element in geometrically nonlinear analyses. ","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44759021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Improvement of friction estimation along wellbores using multi-scale smoothing of trajectories 利用多尺度轨迹平滑改进沿井摩擦估计

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-09-11 DOI: 10.13052/ejcm1958-5829.2834

E. Garcia, J. Liandrat, P. Dufourcq

{"title":"Improvement of friction estimation along wellbores using multi-scale smoothing of trajectories","authors":"E. Garcia, J. Liandrat, P. Dufourcq","doi":"10.13052/ejcm1958-5829.2834","DOIUrl":"https://doi.org/10.13052/ejcm1958-5829.2834","url":null,"abstract":"Drilling monitoring aims at anticipating and detecting any drill string failures during well construction. A key element for the monitoring activity is the estimation of friction along the wellbore trajectory. Friction models require the evaluation of the actual wellbore trajectory. This evaluation is performed applying any of various reconstruction methods available in the industry to discrete deviation measurements. Although all these methods lead to nearly identical bit location, friction estimations are highly dependent on reconstruction methods due to huge dierences in the trajectory derivatives. To control this instability, a new reliable estimation of wellbore friction using a nonlinear trajectory smoothing process is introduced. This process uses a multi-scale approach and a specic nonlinear smoothing through subdivision schemes and their related decimation schemes. Two smoothing processes are compared: one using an interpolatory subdivision operator, and the other, a non-interpolatory subdivision operator. Validation has been performed on a synthetic plane noisy trajectory. The non-interpolatory process provides trajectory derivatives estimate much closer to those of the initial trajectory. Both processes have been applied to a real three-dimensional wellbore trajectory, improving signicantly the friction estimates.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2019-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44895632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Error Indicator Based on a Wave Dispersion Analysis for the Vibration Modes of Isotropic Elastic Solids Discretized by Energy-Orthogonal Finite Elements 基于色散分析的能量正交有限元离散各向同性弹性固体振动模态误差指示器

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-09-02 DOI: 10.13052/ejcm1958-5829.2833

F. Brito

引用次数: 1

Numerical Investigation of Ferrofluid Sloshing by Applying MHD Magnetic Field: Using Level Set Method MHD磁场对铁磁流体晃动的数值研究:基于水平集法

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-09-01 DOI: 10.13052/ejcm1958-5829.2844

R. Maroofiazar, M. Daryani, Amir Reza Vakhshouri

{"title":"Numerical Investigation of Ferrofluid Sloshing by Applying MHD Magnetic Field: Using Level Set Method","authors":"R. Maroofiazar, M. Daryani, Amir Reza Vakhshouri","doi":"10.13052/ejcm1958-5829.2844","DOIUrl":"https://doi.org/10.13052/ejcm1958-5829.2844","url":null,"abstract":"The sloshing phenomenon has exceptional significance due to its occurrence in various processes as well as its application. This phenomenon occurs when a vessel is partly filled with a fluid and under the influence of external forces the free surface of the liquid moves and exchanges forces with the wall of the vessel. In this research, numerical modeling is used to study the behavior of ferrofluid in sloshing phenomenon in a rectangular container with a specified length and width of 10 cm × 5 cm respectively. The force that moves the vessel is the oscillatory motion in the x-axis direction. Applying a uniform magnetic force, which creates additional modules in the governing equations, such as the momentum equation, has effects on this phenomenon and fluid motion. The main aim of this research is to study the effects of the uniform MHD field in different directions and angles on the ferrofluid sloshing. By studying the results of some factors (such as; the pressure of the ferrofluid to the specific points on the vessel wall, the maximum surface at any time, and the analysis of the surface situation at different times) the impact of the magnetic field with different angles has been identified on the ferrofluid sloshing. The results showed that in the absence of an external magnetic field, the sloshing behavior of water and ferrofluid were approximately the same. Applying the MHDmagnetic field caused a 14.5%, 25% and 36% decrease in the maximum height of the fluid level at angles 0◦, 45◦ and 90◦ of magnetic field respectively. Therefore, these results indicate the influence of the magnetic field direction on the behavior of the ferrofluid sloshing.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45405669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Simulation of Fluid-Structure Interaction of D-shape Iced Conductor d型结冰导体流固耦合的数值模拟

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-08-27 DOI: 10.13052/ejcm1958-5829.2832

Yang Zhitao, You Yi, Yang Xiaogang, Liu Wensheng, He Cheng, N. Chun, L. Jun

引用次数: 1

A Finite Element Formulation for Kirchhoff Plates in Strain-gradient Elasticity 应变梯度弹性Kirchhoff板的有限元公式

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-08-19 DOI: 10.13052/ejcm1958-5829.2831

Alireza Beheshti

引用次数: 2

Bending analysis of anisotropic functionally graded plates based on three-dimensional elasticity 基于三维弹性的各向异性功能梯度板弯曲分析

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-02-04 DOI: 10.1080/17797179.2018.1560844

M. Gholami, A. Hassani, S. Mousavi, R. A. Alashti

引用次数: 5

Asymmetric compressive stability of rotating annular plates 旋转环形板的非对称压缩稳定性

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-01-16 DOI: 10.1080/17797179.2018.1560989

H. Bagheri, Y. Kiani, M. R. Eslami

{"title":"Asymmetric compressive stability of rotating annular plates","authors":"H. Bagheri, Y. Kiani, M. R. Eslami","doi":"10.1080/17797179.2018.1560989","DOIUrl":"https://doi.org/10.1080/17797179.2018.1560989","url":null,"abstract":"In the present research, buckling behaviour of an isotropic homogeneous rotating annular plate subjected to uniform compression on both inner and outer edges is analysed. It is further assumed that the plate is rotatingwith a constant angular speed. Formulation is based on the first order shear deformation plate theory, which is valid for thin and moderately thick plates. The complete set of equilibrium quations and the associated boundary conditions are obtained for the plate. Prebuckling loads of the plate are obtained under flatness and axisymmetric deformations. Using the adjacent equilibrium riterion, the linearised stability equations are extracted. An asymmetric stability analysis is performed to obtain the critical buckling loads of the plate and the buckled configurations of the rotating plate. To this end, trigonometric functions through the circumferential direction and the generalised differential quadrature discretization across the radial direction are used which result in an algebraic eigenvalue problem. Benchmark results are given in graphical presentations for combinations of free, simply-supported, sliding supported, and clamped types of boundary conditions. It is shown that rotation enhances the buckling loads of the plate for all types of boundary conditions and alters the buckled shape of the plate.","PeriodicalId":45463,"journal":{"name":"European Journal of Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":1.2,"publicationDate":"2019-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/17797179.2018.1560989","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47896555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

Static and free vibration of plates with a strain based brick element 基于应变的砖单元板的静态和自由振动

IF 1.2

European Journal of Computational Mechanics Pub Date : 2019-01-03 DOI: 10.1080/17797179.2018.1560845

A. Messai, L. Belounar, T. Merzouki

引用次数: 13