查询词典 fem

The difference and relationship among design feature、machining feature and FEM feature are clearly presented. The necessary of feature mapping in product concurrent design system is discussed, and its theory and method are systematically studied.

详细分析了特征信息在产品生命周期中各应用环节的重要作用，揭示了设计特征、工艺特征以及分析特征的本质区别和内在联系，讨论了特征变换的必要性和特征变换的理论方法，指出建立一种柔性的特征表示模型，开发基于约束和参数驱动的特征造型系统，能方便的实现不同应用特征之间的变换，是实现CIM和CE的关键技术。

Then,the vibration of the model is calculated by using the FEM. Comparing the level of vibration with different multilevel quadrate steel beams,the effects and rules of isolating vibration are tested.

然后用有限元软件模拟计算了加多级方钢隔振后的结构振动水平，通过比较分析，得到了多级方钢的隔振效果和振动能量在其间的传播规律。

The brazing process includes selection of brazing materials, pre-brazing preparation, regulation and deformation control of brazing parameter. The Al-Si alloy wires core was used as filler metal and the gasoline flame with quincunx nozzle was used as heating source. Through FEM analysis, a set of technological equipment was designed to control brazing distortion.

通过对焊接材料、焊接规范、焊接工装等方面进行的试验和分析，确定了6063铝合金门窗框的钎焊采用无腐蚀性的Al-Si合金铝钎焊药芯焊丝作为钎料，汽油火焰作为加热热源的工艺方案，并通过有限元分析设计了简单易用的焊接工装以控制焊接变形。

On the basis of nonlinear FEA code ANSYS/LS-DYNA, rail rolling process of universal rolling unit were simulated by 3D large deformation thermal-mechanical coupled elastic-plastic FEM. And the deformation shape of the work piece, deformation parameters and cross dimensions for each pass were obtained and stress,stain distribution and metal flow in rolling process of typical passes were analyzed in detail. Analyzed typical pass stress and strain distribute, rolling stress and deforming in universal pass last groove in detail,discussed the effect regularity of residual stress distribution and size to safely using rail, detailed to expound universal pass to railhead tread circular arc process.

本文基于ANSYS/LS-DYNA非线性显式有限元软件，以60kg/m的重轨为研究对象，采用全三维弹塑性热力耦合的有限元方法研究了重轨在万能轧机组中的变形过程，得到了轧件在孔型中的延伸情况、各道次轧件的变形参数，分析了典型道次的应力、应变分布，并详细分析了全万能成品孔型中轧件受力和变形情况，讨论了残余应力的分布及大小对钢轨安全使用的影响规律，详细地阐述了全万能成品孔型对轨头踏面圆弧的加工过程。

During the simulation, surface current from primary electrode is computed. Taking rectangular triangle as the mesh unit, the integral formula of surface current can be simplified to a product of a difference expression and the surface area. So the computation complexity of FEM will be decreased and the time-cost will be cut down greatly.

在模拟过程中，需要计算主电极表面电流，通过选用直角三角形作为离散单元，将表面电流的二重积分表达式简化为一个差商表达式与主电极表面积的乘积，极大地降低了有限元分析的复杂度，减少了计算时间。

In this paper, through FEM residual stress relaxation at hot spot is studied under arbitrary variable amplitude cyclic loading, and the relation of the sum of residual stress relaxation, residual stress and the applied load is revealed.

该文通过有限元方法分析了在任意变幅循环载荷下，疲劳热点处的残余应力释放的规律，归纳出残余应力释放的大小与初始残余应力和外载荷之间的关系公式。

To validate the FEM calculations of the cylinder block of a six-cylinder in-line diesel engine,the dynamic strain-stress and temperatures of the main bearing wall s and caps were measured on engine testbed with strain-gauge and resistance thermometer.

为评估某直列6缸柴油机缸体有限元强度分析结果，采用应变电测法实测了该发动机缸体上可能的危险部位主轴承座、主轴承盖动态应力以及这些部位的温度。

On this basis, local resonance is studied by FEM, the impact on some parameter to that is sought, and the mechanism and the production condition of local resonance of ultrasonic vibration system is discussed.

在此基础上，用有限元方法和阶梯形变幅杆模型对局部共振进行研究，探寻了各个参数对局部共振的影响，讨论了超声振动系统局部共振现象的机理，提出了局部共振的产生条件。

As a part of the Rootstalk foundation research ,the paper introduce contrast of the vertical load and pull capacity, horizontal push capacity between the rootstalk foundation and the common caisson by means of 3-D FEM software analysis. The analysis shows that the rootstalk foundation has great practical potential and its mechanical behavior are preliminarily discussed.

本文结合参与安徽省高速公路总公司根式基础课题组的工作，应用三维有限元软件对根式基础与普通沉井基础进行了竖向抗压抗拔承载力，水平抗推承载力数值模拟对比，说明根式基础在工程应用上的潜力，并对根式基础的受力机理进行了初步探讨。

Some concepts about the reliability are described, and the method for calculating the reliability of system is provided by making linear substitution. While taking Stochastic Finite Element Method into the reliability calculation, a Nonlinear SFEM model is founded, and methods to resolve some problems in SFEM calculation are given. So as to the calculation of the force boundary, a method in FEM is provided for sabot pressure calculation, base of this, the numerical calculation model is carried out.

给出了弹丸发射强度可靠性计算中的一些理论和概念；给出了串联系统可靠性的逐步线性等效计算方法；将随机有限元方法引入可靠性计算中，建立了弹丸发射时的非线性随机有限元计算模型，并给出了计算中的一些问题的处理方法；在随机有限元的载荷边界的计算中，提出了弹带压力的有限元计算方法和在有限元求解思想上的数值计算模型。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。