查询词典 boundary element method

A detailed analysis on interference fit of hub was carried out by means of elastic mechanics and finite element method, in view of the above, the shortcomings of elastic mechanics method and the advantages of finite element method have been pointed out.

用弹性力学和有限元方法对轴毂过盈联接进行了详细的分析，据此指出了弹性力学方法的弊端和有限元方法的优势。

An equal cross-section blade was investigated and a finite element model was built parametrically. Geometrical parameters (such as length, width and thickness), material parameters (such as young's modulus and density) and speed of blade were considered as input random variables while the static frequencies and dynamic frequencies were output random variables. Combining the finite element method, response surface method and Monte Carlo method, the statistical properties and cumulative distribution functions of static frequencies and dynamic frequencies were obtained. Probability sensitivities analysis, which combined the slope of the gradient and the width of the scatter range of the random input variables, was applied to quantitatively evaluate the sensitivities of static frequencies and dynamic frequencies with respect to the random variables. The Scatter plots of structural responses with respect to the random input variables were illustrated how to adjust the values of the static frequencies and dynamic frequencies by changing input random variables.

文中以某试验台用汽轮机等直叶片为研究对象，考虑几何参数、材料参数和转速的随机性，通过有限元参数化建模，将确定性有限元方法、响应面方法和Monte-Carlo模拟法相结合，从而获得了叶片静频、动频的统计特性和累积分布函数；同时考虑随机变量的梯度和离散范围对静、动频的影响，通过概率敏感性分析，定量地判断出叶片静、动频对随机输入变量的敏感性；通过绘制叶片静、动频与输入变量的散点图，定量地分析了如何改变随机变量以调整静、动频率的方法。

Differential matrices are obtained on the element in accordance with continuous intervals of discontinuous boundary value problem to divide the computing elements and approximating unknown function on the element in term of barycentric Lagrange interpolation.

按照间断边值问题的连续区间划分计算单元，在每一个单元上采用重心Lagrange插值近似未知函数，得到每一个单元上的微分矩阵。

The results show that the electrochemical window is 3.40V, the crystal grain of new deposit aluminum is ideal, and the boundary of crystal grain is perfect. The main element is aluminum and trace element is oxygen on the surface of cathode.

研究结果表明：铝基离子液体Br-AlCl3的电化学窗口为3.40V；扫描电镜分析表明，阴极新生态的铝晶粒生长完整、晶界完善；X射线能谱分析阴极表面新生态铝的结果显示主元素为铝，微量元素为氧。

First the FEM-BI (Finite Element – Boundary Integral Methods) base on vector element is presented to compute the electric field in the cavity backed antennas.

计算中首先采用基于矢量单元的"有限元－边界积分方程法"计算出背腔天线内部电场的分布；再采用互易原理求解天线的远区场，从而获得天线的辐射方向图。

Based on the analysis of the results of these two cases, the rule of element's σ, at different position is presented, and it shows that the steel panel can effectively reduce the maximal σ, of the element adjacent to the steel panel, and can postpone the arriving time within the simulation time. At the same time, the simulation reveals that the boundary effects don't affect the spalling in the similar structure presented in this paper.

通过对两种情况下的结果分析，揭示了混凝土不同位置处单元σ值的时程规律，得到了在计算时间内钢板的存在能够有效地减小相邻混凝土单元的最大拉应力，并延长其出现时间；同时得到了在类似研究的工程结构中，边界效应对混凝土层裂现象无影响。

We constructed a finite volume scheme of fifth order Hermite type with high accuracy for twopoint boundary value problems, choosing trial and test spaces as the fifthorder finite element space of Hermite type and the piecewise linear function space respectively. We didn't use higher derivatives as interpolation conditions, which is the same as the thirdorder finite element of Hermite type, but the scheme obtained had higher accuracy.

构造求解两点边值问题的一种Hermite型五次元高精度有限体积法，其中试探函数空间取Hermite型五次有限元空间，与Hermite型三次元相同，未引入更高阶导数作为插值条件，检验函数空间取分段线性函数空间，这样构造的格式求解精度更高。

In the analysis a 2 dimension element is combined with the boundary punition element to calculate stress distribution at the periphery of a tunnel.

将边界罚单元引入有限元方程来处理复杂边界条件问题，开巷初期在巷道周边设置一周边界弹簧元。

The finite element model contains the establishment of the model with variable section element and the disposal of the boundary conditions of the suction valve with point stop and the discharge valve with back plate.

本文采用变截面梁单元建立了吸气与排气舌簧阀的有限元模型并处理了具有点状升程限制器的吸气阀片和具有背板曲线升程限制器的排气阀片的边界条件。

In this paper, a lot of research works of algorithms of mining CAD has been done. Many important mine specialty graph operation algorithms have been put forward. The main results are as follows: polygons cut out algorithm, two close polygons mutual, merge and subtract algorithm, polygon vector fill, any vector polygons area calculating and sequence polygons or multifold which has the direction and region area calculating, curve smoothing, graph element search for any region, graph element attrib collect in any region, parallel polygon or vector intersection-point push out or pull in, ore reserves and grade calculating for any type polygon, mine spatial data searching and boundary line tracking and automatic link algorithm etc.

论文在矿山图形算法研究方面做了大量的工作，提出了许多有价值的矿山专业图形运算算法，主要算法有：多边形裁剪算法、闭多边形的加、减、并算法、多边形的矢量填充算法、任意有向多边形、有向多连域、有向多边形序列面积算法、多种曲线光滑算法、任意区域的图元搜索算法、任意区域图元属性提取算法、多边形平行外推/内缩算法、任意多边形储量品位计算、矿山空间数据搜索算法、界线的自动追踪和连接等。

I hope that this success is just the first in a long series.

我希望这只是成功的开始。

Three dimensional stresses on the interface of tire and soil, tire deflection and soil sinkage are measured.

测试轮胎——沙土界面上的三向应力、轮胎变形和沙土沉陷；建立考虑剪切应力对沙土承载特性产生影响的车轮牵引性能预测模型；分析车轮作用下土壤的纵向稳定性。