查询词典 finite difference approximation

Finite element analysis of the rear face scabbing size is also performed. The equivalent material moduli of the steel-fiber reinforced concrete slabs are calculated by the equivalent inclusion method for the finite element model.

本研究中另以等价同质体法理论及有限元素数值模拟的方法，计算钢纤维混凝土板於遭受低速撞击后靶板背面之疤落破坏直径，其结果并与实验量测数据进行比对，俾验证数值计算分析之合理性与适用性。

The mesh model was then built in ALGOR, the finite element analysis software. Results The three dimensional finite element model was constructed on the computer, which had 47 155 nodes and 41 878 tetrahedrons elements.

结果：所构建的三维有限元模型具有良好的几何相似性，共有单元47 155个，节点数41 878个，可以按照不同的研究要求进行删除、旋转、切割和添加。

Compared with the research of the geometric nonlinear finite element method home and aboard in the components such as bar, plate, beam and shell element, the present problems is analyzed and the future research direction is described for the theoretical research and program design of geometric nonlinear finite element method.

综合比较了几何非线性有限元法在杆、梁、板、壳等方面的国内外研究成果，指出目前仍存在的问题，提出今后的发展方向，为几何非线性有限元的理论研究与程序设计提供参考。

In this paper, design is first conducted for the bed of a CNC lathe and Pro/ENGINEER is employed for modeling, then Pro/MECHANICA is used for finite element analysis. It is shown by the result that measures like finite element analysis can be employed for optimization design, thereby avoiding the inherent structural defects and disadvantages.

本文首先对某数控机床的床身进行设计并利用Pro/ENGINEER建模，然后运用Pro/MECHANICA对其进行有限元分析，结果表明：有限元分析等手段可以进行最优化的设计，避免结构存在先天上的缺陷和不足。

In this dissertation, first, based on theory of cutting tooth about the gleason spiral bevel gear, the equation of meshing in the process of cutting tooth, the surface equation of generating gear as well as the general tooth surface equation of the double circular arc spiral bevel gear, using GB12759-1991 type of double circular arc gear as a basic gear profile, a three-dimension solid model of double circular arc spiral bevel gear which has the good adaptability was carried out by used of Unigraphics software;Second, by researching of the algorithm about contact and collision as well as various contact types based upon Contacting Finite Element Method, a foundation was laid for selecting the contact type in analyzing contact stress of double circular arc spiral bevel gearing;Finally, through the connection port of PARASOLID between UG software and ANSYS/LS-DYNA software, the three-dimension solid model of double circular arc spiral bevel gearing obtained above in UG was imported into ANSYS/LS-DYNA, a finite element analyzing about contact stress of double circular arc spiral bevel gearing was carried out by applying new loading method.

本文首先基于格利森弧齿锥齿轮加工原理及切齿啮合过程中的啮合方程、产形轮齿面方程以及双圆弧弧齿锥齿轮的齿面方程，选用GB12759-1991型双圆弧齿轮基本齿廓为基准齿形，利用Unigraphics软件的建模功能，绘制了有较好适应性的双圆弧弧齿锥齿轮传动三维实体模型。其次，描述了应用有限单元法进行实体接触与碰撞问题算法的公式，研究了有限元分析中的各种接触类型以及双圆弧弧齿锥齿轮接触应力分析中所选择接触类型的依据。最后，通过UG软件和ANSYS/LS-DYNA之间的PARASOLID接口工具包，将UG软件中得到的啮合齿轮模型导入ANSYS/LS-DYNA有限元分析软件，给出一种新的加载方法，进行了双圆弧弧齿锥齿轮传动的接触应力的有限元分析。

New progresses in finite element analysis for telescopic box section hoist boom of truck cranes are summarized. Merits and defects of existing finite element methods arc analyzed.

总结汽车起重机箱形伸缩式吊臂有限元分析国内新进展，分析现有的有限元方法优缺点。

Considering the loading and boundary conditions of the model finite element calculation is carried out. Both for the working conditions of prestress and load, the finite element model of the box beam is approved to be suitable and correct by the actual test results.

考虑模型的载荷及约束进行有限元计算，在预应力和载荷两种工况下，利用实测结果论证了箱型梁的有限元分析模型是合适和准确的。

A finite element modeling and analysis of the assembly of a breech mechanism in locking condition was carried out with special finite element techniques such as contact element, gap element and spring element.

利用接触元、间隙元和弹簧元特殊单元，对某大口径火炮的炮尾-闩体-曲臂机构进行了闭锁状态下装配体有限元建模和分析。

The finite element analysis model of pre-pressing contact of low carbon steel resistance spot welding un-der spherical electrode condition is created with the finite element software.

1前言电阻点焊是汽车制造领域中的主导加工工艺，每辆汽车上的电阻焊点平均为3000～5000个[1]，因此电阻点焊的质量很大程度上影响着汽车的质量。

In this paper,the authoruses the method of the explicit finite-element numerical simulation, which isbased on the most simple two-dimensional-finite-element modle and kinematicsource model,to study the basic characteristics of near-fault ground motion, suchas the changing tendency of the hanging-wall effect and the vertical effect as weonly change the fault dip or the depth of the top of the fault.

本文拟利用最简单的二维有限单元模型和基于有限断层假定的震源运动学模型，采用集中质量显式有限元数值模拟的方法研究近断层地震动的特征，如上盘效应和竖向效应随断层倾角以及断层的上界埋深的变化而改变的趋势。

We were cousins—his grandfather was King of Scots,and his great-grandfather was Henry VII of England.

我们是堂姐弟——他的祖父曾是苏格兰国王，他的曾祖父是英格兰的亨利二世。

I do want to help you, but I am in a quandary now!

我是想帮你，但是我现在左右为难啊！