查询词典 finite element method

In this thesis, it is analysed how to calculated the stable seepage field of earth rock-fill by finite element method, then the principle and the step of the volume method is also expatiated on the basis of former research achievments.

本文在总结前人研究成果的基础上，对利用有限单元方法计算土石坝稳定渗流场进行了研究和分析，并阐述利用体积加权法计算稳定渗流场的原理和步骤。

The initial creep stress method and the finite element method for unstable temperature field are used in the stress analysis of RCD concrete gravity dam. The true process of RCD dam placing is modeled by load analysis.

基于不稳定温度场的显式有限元解法和徐变应力的初应变法，对碾压混凝土重力坝进行了模拟坝体升程的施工过程和蓄水、放水运行全过程的温度、应力仿真计算。

It is a important method in structural analysis that simulating prestressed concrete structure using finite element method.

用有限元方法模拟预应力混凝土结构，是进行结构分析计算时的一种重要手段。

Based on design calculation, analysis of finite element method and fullscale experimental study on the joint of Chongqing Olympic stadium, the design procedure and analysis method of the joint were studied. In addition, the space properties are obtained and design suggestions of cast steel hollow spherical joint with tube were presented.

本文通过对重庆奥林匹克体育中心工程中的铸钢空心球管节点的设计与有限元分析的研究以及节点的足尺模型试验研究，探讨了该类型节点的设计过程与分析方法，得出节点的空间受力特点，并对该类型节点的设计提出几点建议。

The meshfree method has the advantage over the finite element method on constructing shape function without predefining meshes.

无网格法为近十几年来逐渐日趋成熟的演算法，相较於传统的有限元素法，其具有不需使用网格建立形状函数之特点，让无网格法摆脱有限元素法在处理某些问题遭遇到的限制。

In this paper, the finite element method and the rotationally periodic analytical method are jointly employed to study the dynamics of fluid-structure coupling systems, the relevant analytical methods and program implement are provided.

本文采用有限元法结合旋转周期分析方法对流固耦合系统的动力性能进行了系统研究，给出了有关的分析方法和程序实现。

Traditional sports teaching method,already could not adapt the new times sports curriculum to reform; this article means which through the literature law, the questionnaire investigation law, the cut-and-try method unifies, carries on the comparison to the traditional each sports teaching method, discovered the sports competition teaching method can adapt the new times student sports demand; the competition teaching method is unifies the traditional teaching method in the foundation one new teaching method, proved through the experiment, its teaching effect is good.

一些传统的体育教学思想、教学理念、教学方法、教学模式已经不能够适应现代教学的需要，在此过程中，为提高教学质量，就必须对教学方法进行改革。作为体育教学，如何进一步转变体育教育思想，深化体育教学改革，摆脱旧的传统的教学体系、思想体系和理论模式，逐步形成一个新型的，具有中国特色的教学过程和教材体系，使我国体育教学面向未来社会的需要，跟上21世纪学校体育发展的需要，是本文探讨和研究的问题。

Among used machine learning methods, the gradient descent method is widely used to train various classifiers, such as Back-propagation neural network and linear text classifier. However, the gradient descent method is easily trapped into a local minimum and slowly converges. Thus, this study presents a gradient forecasting search method based on prediction methods to enhance the performance of the gradient descent method in order to develop a more efficient and precise machine learning method for Web mining.However, a prediction method with few sample data items and precise forecasting ability is a key issue to the gradient forecasting search method. Applying statistic-based prediction methods to implement GFSM is unsuitable because they require a large number of data items to model a prediction model. In the contrast with statistic-based prediction methods, GM(1,1) grey prediction model does not need a large number of data items to build a prediction model, and it has low computational load. However, the original GM(1,1) grey prediction model uses a mathematical hypothesis and approximation to transform a continuous differential equation into a discrete difference equation in order to model a forecasting model.

其中梯度法是一个最常被使用来实现机器学习的方法之一，然而梯度法具有学习速度慢以及容易陷入局部最佳解的缺点，因此，本研究提出一个梯度预测搜寻法则(gradient forecasting search method， GFSM)来改善传统梯度法的缺点，用来提升一些以梯度学习法则为基础的分类器在资讯探勘上的效率与正确性；而一个所需资料量少、计算复杂度低且精确的预测模型是梯度预测搜寻法能否有效进行最佳解搜寻之关键因素，传统统计为基础之预测方法的缺点是需要较大量的数据进行预测，因此计算复杂度高，灰色预测模型具有建模资料少且计算复杂度低等优点，然而灰色预测理论以连续之微分方程式为基础，并且透过一些数学上的假设与近似，将连续之微分方程式转换成离散之差分方程式来对离散型资料进行建模及预测，这样的作法不尽合理，且缺乏数学理论上的完备性，因为在转换过程中已经造成建模上的误差，且建模过程仅考虑相邻的两个资料点关系，无法正确反应数列未来的变化趋势。

A mixed method of conjugate gradient method and steepest descent method ;2. The Modified Steepest Descent Method──Best Point in Steepest Descent method;3. This paper presents the mathematical model for the optimization of heterogeneous components, and the method using sensitivity analysis and steepest descent method to optimize material properties, the component is then identified.

阐述了非均质材料零件设计优化的数学模型，并采用灵敏度分析以及最速下降法对其各个材料区域的材料性能进行设计优化，得到最佳材料性能参数后，再从非均质材料数据库中找到相应的工程材料，合成满足设计要求的非均质材料零件该方法为设计者提供了切实可行的非均质材料零件的材料设计方

By using accelerating Aitken method in iterative method of nonlinear equations, a new modified method is given. The method is applied to modified Newton method, thereby a new method is developed, which is faster and stable. Also, its algorithm is given. Numerical results show that the new method is very efficient.

通过对非线性方程组的迭代法引入Aitken加速技术，设计了一种非线性方程组的迭代解法的加速方法；将该方法与M步Newton法相结合，得到一种收敛速度快而且计算稳定的方法，并给出了具体算法；数值结果表明了新算法是有效的。

But now there is an alternative ...

但现在还有一个替代的。。。

Choosing the fitting fasteners and controling the preload is the key to ensure the reliability of screw joint structure.

保证螺纹连接结构可靠性的关键是选用合适的紧固件并控制其预紧力。