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可动边界     
相关语句
  moving boundary
     Chaotic Behaviour of the Mechanical Systems with Moving Boundary
     一类具有可动边界的机械振动系统的混沌行为
短句来源
     Variations of Functional Problems with Moving Boundary in Multiple Integral Form and Their Consequences
     重积分形式泛函的可动边界问题的变分与推论
短句来源
     UNSTEADY MOVING BOUNDARY FLOW BY BOUNDARY ELEMENTS
     不定常可动边界流的边界元解法
短句来源
     Theoretical Analysis of Self Excited Vibration in Mechanical System with Moving Boundary and Clearance
     具有可动边界和间隙的机械系统自激振动分析和数值模拟
短句来源
     Time-Space Boundary Element Method for Transient Heat Conduction with Moving Boundary
     边界元法在带可动边界的瞬时热传导问题中的应用
短句来源
更多       
  movable boundary
     The free surface is treated as movable boundary in traditional numerical methud of seepage analysis.
     自由面渗流分析的传统方法是将自由面作为可动边界处理。
短句来源
  variable boundary
     Variational Principle of the Variable Boundary for the Contact Problem
     接触问题的可动边界变分原理
短句来源
     Based on variational problem of variable boundary in calculus of variation, we have established the vatiational principles of optimum subdivision for non-conforming element and subdivision grid.
     基于变分法中的可动边界变分理论,建立了有关非协调元与细分网格的有限元最佳剖分变分原理。
短句来源
     With the variational principle of variable boundary, we study the crack extension on nonlinear elasto-plastic conditions.
     应用可动边界的变分问题,研究了非线性弹性理论的裂纹扩展。
短句来源
     Variational Principles of the Variable Boundary for the Elastoplastic Body
     弹塑性体的可动边界变分原理
短句来源
     Based on [ 1 ], we further apply the variational principles of the variable boundary to research the discretization analysis of the solid system, so that we derived the generalized Galerkin's equations of the finite element, the boundary variational equations and the boundary integral equations.
     在[1]的基础上,我们进一步应用可动边界的变分原理于固体体系的离散分析,得到有限元广义伽略金方程,边界变分方程,边界积分方程. 这些方程描述了待解函数在元素内部与元素的边界上应满足的方程.
短句来源
更多       
  moving boundary problem
     An Exact Solution to the Moving Boundary Problem with Fractional Order Anomalous Diffusion in Controlled Drug Release System
     药物控释系统中分数阶反常扩散可动边界问题的精确解
短句来源

 

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      moving boundary
    A two-dimensional displacement problem in nonhomogeneous layered strata in the presence of an unknown moving boundary
          
    The diffraction of a sound wave by a slit in an unbounded plane is analyzed as an initial-boundary-value problem with a moving boundary for the two-dimensional wave equation.
          
    Depending on the character of the salinization and the water-physical properties of the soil at the moving boundary, there are given either the values of the sought function or of its derivative with respect to the spatial variable.
          
    Free Fluid Flow Through a Visco-Deformable Porous Medium with a Moving Boundary
          
    The heating and ablation of the heat-shield coating is determined by numerically solving the heat conduction equation with a moving boundary.
          
    更多          
      movable boundary
    The problem of determining the velocity field excited by a sound wave impinging on a plate at rest is analyzed as an initial- and boundary-value problem with a movable boundary for the two-dimensional wave equation.
          
    Results obtained are explained in terms of a diffusion model with a movable boundary of the metal layer.
          
    Then a movable boundary bandwidth access policy is chosen.
          
    The first one is caused by thefinite displacement of a movable boundary, and the second one is thevolume nonlinearity of gas.
          
    In the classical model of a hybrid switching system with movable boundary it is assumed that blocked voice messages are lost and do not affect the further functioning of the system.
          
    更多          
      variable boundary
    A method is proposed for the approximate solution of nonsteady heat-conduction problems under the nonsymmetric and time-variable boundary conditions of the third kind, applicable to bodies of arbitrary shape.
          
    A solution of direct and converse two-dimensional problems of nonstationary heat conduction with variable boundary conditions us
          
    A procedure is developed for determining transfer functions and by employing them to solve direct and converse two-dimensional problems of nonstationary heat conduction with variable boundary conditions for a hollow cylinder.
          
    Approximate method for the numerical solution of unsteady heat conduction problems with variable boundary conditions of the thir
          
    An approximate method for solving unsteady heat conduction problems with variable boundary conditions of the third order, which can be used for bodies of complex shape, is described.
          
    更多          
      moving boundary problem
    A nonlinear problem, which is a moving boundary problem for the geometrically nonlinear elasticity in radial symmetric, is solved analytically.
          
    Moving Boundary Problem for Diffusion Release of Drug from a Cylinder Polymeric Matrix
          
    An approximate analytical solution of moving boundary problem for diffusion release of drug from a cylinder polymeric matrix was obtained by use of refined integral method.
          
    Moving boundary problem for diffusion release of drug from a cylinder polymeric matrix
          
    An approximate analytical solution of moving boundary problem for diffusion release of drug from a cylinder polymeric matrix was obtained by use of refined integral method.
          
    更多          


    This paper puts forward a new solid variationsl principle of discrete form. Basing on the true case of the discrete analysis by the finite element method and considering the variable boundaries of the elements and the unknown functions of piece wise approximation, it has been found out that the unknown functions have various discontinuities at the interfaces between successive elements.

    本文提出一类新的固体的离散型变分原理.它是从有限元离散分析的实际出发,考虑到元素的边界为可动边界,并且由于分片构造待解函数,使待解函数在元素的交界处具有各种间断性.由此,我们利用数学中的具有各种间断性的可动边界的变分方法,基于一阶变分为零的驻值条件上,建立了固体的离散型变分原理.离散型变分原理消除了元素交界处所导入的误差.它概括了古典与非古典变分原理.本文得到的待解函数应满足的交界方程,是有限元的收敛性(包括非保形元素在内)的必要条件,它开拓了待解函数应满足协调性的收敛性要求。

    In this paper, a method of the numerical simulation for predicting soil water movement under subsurface irrigation with permeable tubes is presented.The physical process within the flow region is analyzed first, and then the numerical models are presented. Combining the Darcy's law and the law of conservation of matter, we obtained the governing equation which may be written in rectangular coordinates, as well as in polar coordinates. Each of the above equations contains two auxiliary functions, K(θ) and D(θ),...

    In this paper, a method of the numerical simulation for predicting soil water movement under subsurface irrigation with permeable tubes is presented.The physical process within the flow region is analyzed first, and then the numerical models are presented. Combining the Darcy's law and the law of conservation of matter, we obtained the governing equation which may be written in rectangular coordinates, as well as in polar coordinates. Each of the above equations contains two auxiliary functions, K(θ) and D(θ), thus they are nonlinear partial differential equation. It is considered that the ring of quasi-saturated soil around the permeable tubes may increase as time goes on. So moving boundary condition is applied.In this paper, a numerical analysis based on a finite difference scheme involving the use of iterative alternating direction implicit and prediction-correction techniques is feasible to carry out numerical simulation model. With the aid of digital computer TQ-16, the results of numerical solution at each node are obtained.The laboratory tests to determine the characteristics of infiltration during subsurface irrigation were run in a large soil chamber with inside dimensions of 150× 150 × 20cm3. The experimental data are compared with the predictions of the numerical simulation.Based on these comparisons, it was concluded that the numerical simulation presented herein can be used to predict soil water movement under subsurface irrigation for some practical purposes.

    本文首先对渗灌时土壤水流的物理过程进行了描述,并且确定了所研究的土壤水流区域:然后在此基础上,以边值问题的形式写出了两种数学模型.模型中采用Richards方程作为控制方程,它可以写成直角坐标或极坐标方程的形式.在透水管附近的土壤中,可能会出现含水量接近或达到最大饱和度的高含水带,其范围大小将随渗灌历时增长而逐渐扩大.考虑到这一情况,本文采用了可动的边界条件. 由于控制方程是非线性的,所以本文不是直接用解析法求解,而是采用以有限差分为基础的数值方法,并借助TQ-16型电子计算机实现这种计算. 为检验文中的数学模型是否可靠,作者在试验室内做了实体模型试验.试验土槽尺度为150×150×120厘米~3,内填砂壤土.通过对试验结果与数学模拟的分析比较,可以看出它们之间基本上是一致的,因此认为文中的数学模拟方法是可行的.

    Based on [ 1 ], we further apply the variational principles of the variable boundary to research the discretization analysis of the solid system, so that we derived the generalized Galerkin's equations of the finite element, the boundary variational equations and the boundary integral equations. These equations represent that the unknown functions of the solid system must satisfy the conditions in the elements Sa or on the boundaries Γa,

    在[1]的基础上,我们进一步应用可动边界的变分原理于固体体系的离散分析,得到有限元广义伽略金方程,边界变分方程,边界积分方程.这些方程描述了待解函数在元素内部与元素的边界上应满足的方程. 当对固体体系进行离散分析时,可以应用这些方程去建立不同情况下的求解待解函数的离散方程.亦可作为相应情况下的简化计算的依据. 由本文得到的边界积分方程可知,在[2]中提出的J积分形式,应用于内部元素边界的围道积分计算是不适宜的.

     
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