The article introduces a finite element procedure using the bilinear quadrilateral element or four-node rectangular element(namely Q4 element) based on a refined first-order shear deformation theory(rFSDT) and Monte C...The article introduces a finite element procedure using the bilinear quadrilateral element or four-node rectangular element(namely Q4 element) based on a refined first-order shear deformation theory(rFSDT) and Monte Carlo simulation(MCS), so-called refined stochastic finite element method to investigate the random vibration of functionally graded material(FGM) plates subjected to the moving load.The advantage of the proposed method is to use r-FSDT to improve the accuracy of classical FSDT, satisfy the stress-free condition at the plate boundaries, and combine with MCS to analyze the vibration of the FGM plate when the parameter inputs are random quantities following a normal distribution. The obtained results show that the distribution characteristics of the vibration response of the FGM plate depend on the standard deviation of the input parameters and the velocity of the moving load.Furthermore, the numerical results in this study are expected to contribute to improving the understanding of FGM plates subjected to moving loads with uncertain input parameters.展开更多
This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich plates.The FGP sandwich plates consist of three layers incl...This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich plates.The FGP sandwich plates consist of three layers including the bottom skin of homogeneous metal,the top skin of fully ceramic and the FGP core layer with uneven porosity distribution.A quadrilateral(Q4)element with nine degrees of freedom(DOFs)per node is derived and employed in analyzing the static bending response of the plate under uniform and/or sinusoidally distributed loads.The accuracy of the present finite element formulation is verified by comparing the obtained numerical results with the published results in the literature.Then,some numerical examples are performed to examine the effects of the parameters including power-law index k and porosity coefficient on the static bending response of rectangular FGP sandwich plates.In addition,a problem with a complicated L-shape model is conducted to illustrate the superiority of the proposed finite element method.展开更多
Depending upon the data,the so-called Business Aviation’recovery’has now been underway for the past nine to 10 years,through ups and downs,and twists and turns.Good news:new business jet sales have been quite robust...Depending upon the data,the so-called Business Aviation’recovery’has now been underway for the past nine to 10 years,through ups and downs,and twists and turns.Good news:new business jet sales have been quite robust through the first half of 2019,with OEMs recording book-to-bills above 1.0 and finally beginning to replenish backlogs,which had been slowly declining over the past several years.展开更多
"按需分配"一一这是玛莎拉蒂对于自己Q4全驱系统类型的定义,也体现出其性能特点。而在意大利北部的冰雪世界CerVinia举行全球首次的玛莎拉蒂冰雪试驾,也真是想向人们证明Q4系统的非凡表现。玛莎拉蒂这套Q4全驱系统被配置在全..."按需分配"一一这是玛莎拉蒂对于自己Q4全驱系统类型的定义,也体现出其性能特点。而在意大利北部的冰雪世界CerVinia举行全球首次的玛莎拉蒂冰雪试驾,也真是想向人们证明Q4系统的非凡表现。玛莎拉蒂这套Q4全驱系统被配置在全新总裁Q4以及Ghibli S Q4上,由于目前全新总裁Q4还没有在国内上市,因此对于中国媒体来说,将体验也就重点放在Ghibli S Q4车型上。展开更多
文摘The article introduces a finite element procedure using the bilinear quadrilateral element or four-node rectangular element(namely Q4 element) based on a refined first-order shear deformation theory(rFSDT) and Monte Carlo simulation(MCS), so-called refined stochastic finite element method to investigate the random vibration of functionally graded material(FGM) plates subjected to the moving load.The advantage of the proposed method is to use r-FSDT to improve the accuracy of classical FSDT, satisfy the stress-free condition at the plate boundaries, and combine with MCS to analyze the vibration of the FGM plate when the parameter inputs are random quantities following a normal distribution. The obtained results show that the distribution characteristics of the vibration response of the FGM plate depend on the standard deviation of the input parameters and the velocity of the moving load.Furthermore, the numerical results in this study are expected to contribute to improving the understanding of FGM plates subjected to moving loads with uncertain input parameters.
文摘This article aims to propose a finite element formulation based on Quasi-3D theory for the static bending analysis of functionally graded porous(FGP)sandwich plates.The FGP sandwich plates consist of three layers including the bottom skin of homogeneous metal,the top skin of fully ceramic and the FGP core layer with uneven porosity distribution.A quadrilateral(Q4)element with nine degrees of freedom(DOFs)per node is derived and employed in analyzing the static bending response of the plate under uniform and/or sinusoidally distributed loads.The accuracy of the present finite element formulation is verified by comparing the obtained numerical results with the published results in the literature.Then,some numerical examples are performed to examine the effects of the parameters including power-law index k and porosity coefficient on the static bending response of rectangular FGP sandwich plates.In addition,a problem with a complicated L-shape model is conducted to illustrate the superiority of the proposed finite element method.
文摘Depending upon the data,the so-called Business Aviation’recovery’has now been underway for the past nine to 10 years,through ups and downs,and twists and turns.Good news:new business jet sales have been quite robust through the first half of 2019,with OEMs recording book-to-bills above 1.0 and finally beginning to replenish backlogs,which had been slowly declining over the past several years.
文摘"按需分配"一一这是玛莎拉蒂对于自己Q4全驱系统类型的定义,也体现出其性能特点。而在意大利北部的冰雪世界CerVinia举行全球首次的玛莎拉蒂冰雪试驾,也真是想向人们证明Q4系统的非凡表现。玛莎拉蒂这套Q4全驱系统被配置在全新总裁Q4以及Ghibli S Q4上,由于目前全新总裁Q4还没有在国内上市,因此对于中国媒体来说,将体验也就重点放在Ghibli S Q4车型上。
