有限元法

The method of finite element discrete and optimal parameter back analysis is adopted.(3) Concentrated on the question of high external water pressure of the deep-lying tunnel, the basic theory and method calculating external water pressure are systematically studied.(4) Based on Jinping cascade 2 hydropower station, numerical simulation rain infiltration of seepage field under different drainage pattern and grouting pattern are studied, also, the high external water pressure is analyzed and studied and some seepage control measures are put forward.

2采用有限元离散—优化法进行参数的反演分析；(3)针对深埋隧洞的高外水压力问题，进一步分析和研究了衬砌水荷载及外水压力的作用机理和计算方法；(4)以锦屏二级水电站深埋长引水隧洞作为本文的主要研究对象，采用考虑降雨入渗渗流场分析的方法对排水方案和灌浆封堵方案不同情况下的渗流场的水头分布进行了数值模拟，并对其外水压力进行了分析和研究，提出了渗流控制的具体措施。

To this end, a numerical approach combined by the finite element method for magnetic fields and the finite difference method for deflection of the microsensor is proposed to analyze quantitatively the deflection under magnetoelastic interaction.

为此，建立了由有限元方法分析磁场与有限差分法计算挠曲变形相结合来计算其结构在磁场中产生磁弹性变形的定量分析程序。

In the research, the study of car impact test and numerical simulation method are both used. Based on works that have done, an impact model containing car model, dummy and restriction system model was built. According to national regulation, different types of impacts were simulated. The fuel cell auto's impact safety was analyzed, and the injury criterion for occupant can be read out directly by simulation data. The main research content of this project is to set up the fuel cell auto's frontal impact model, side-impact model, rear-impact model and the whole frontal impact model, which contains car model, dummy, restriction system model and so on, and calculating these models.

在本课题的研究过程中，博采众长，坚持创新，在综合分析总结前人研究经验的基础上，将实车碰撞试验研究与仿真计算分析方法结合起来，统一车身耐撞性有限元计算分析与乘员在约束系统作用下的运动响应的多体动力学分析，采用整车虚拟碰撞试验法进行燃料电池轿车的碰撞安全性研究，即建立一个集车辆、人体模型及乘员约束系统三者于一体的完整的车辆模型，以国家安全法规为依据，进行各种碰撞型式的整车虚拟碰撞试验，利用仿真计算结果进行燃料电池轿车的碰撞安全性分析，直接预测乘员的伤情指标。

For about 20 years,lots of boffins have do their best in the field,the system reliability theory has made a prominently progress,and produced many theories and methods one after another.

主要以概率论、随机过程论、决策论、博弈论、组合数学和近代数理统计方法为基础，通过有限元、边界元法和随机网络分析技术为计算手段，二十多年来，经过大量科研工作者的辛勤努力，使得系统可靠性理论取得了令人瞩目的成绩，相继提出了多种理论方法。

According to the appearance that the gas in soil can effect the propagate of stress wave, and combine with some test conclusions in three—phase saturated soil under explosion wave, theory of mixture is applied in this paper and the dynamic analysis model and constitutive relation are built.

根据土中气体的存在对应力波的传播有显著影响的现象，以三相饱和土为研究对象，结合三相饱和土在爆炸载荷作用下的有关试验结论，以混合物理论为基础建立动力分析模型和本构关系，在此基础上得到用于三相饱和土的有限元方程，计算结果揭示了动力固结法的若干特点。

The main results were obtained as follows:(1) The calculation results of temperature field indicate that, 6139T radiator was brazed using the stage-by-stage heating process, while 6204T radiator with a larger size was brazed using the temperature difference heating process. The uniform temperature distributions in faying faces were all obtained. And the temperatures were in the range of brazing temperature. It is proved that the finite element models established are reasonable.

取得的主要结果和结论为：(1)温度场计算结果表明，对于6139T散热器，采用分阶段加热钎焊工艺，而对于具有较大尺寸的6204T散热器，采用温差法加热钎焊工艺时，均获得了均匀的钎焊面温度分布，且在钎焊温度范围之内，证明所建立的有限元分析模型是合理的。

By using thermal-stress coupling function of the large finite element method software ABAQUS, a numerical simulation of temperature field and stress field of flange plate in working was made.

为分析此密封结构的可靠性，利用有限元分析软件ABAQUS的热–力耦合功能，对工作过程中法兰盖板的温度场和应力场进行了数值模拟。

Based on the FEM results, influences of bolts number n, flange plate thickness t and bolts edge distance factor η on the failure characteristics and loading capacity are studied.

利用有限元计算结果，分析了螺栓个数n，法兰板厚度t以及螺栓边距参数η等参数对节点破坏形态和承载力的影响。

First, modal resolution of the cabinet is obtained by ANSYS modal analysis; Then, modal experiment of cabinet is carried out with impulse excitation method and corresponding modal parameters are obtained.

首先，采用有限元软件ANSYS理论模态分析对机箱进行模态求解，得到计算模态参数；另外，用脉冲激励法对机箱进行模态实验，得到实验模态参数。

The gap element method is proposed in the paper for two kinds of problems, which include contact problem and gap joint problem. Elasticity contact problem falls into the category of unknown boundary value problems. It follows that the contact area and contact conditions or states can never be determined without special mathematical analysis, which is a very difficult work. The boundary conditions of the contact surfaces are deduced.

文中给出了间隙元法在空间可动部件接触问题中的应用，推导了其几何边界条件和力学边界条件，利用虚功原理推导了含间隙元弹性接触问题的有限元方程式，给出了其数值解法的迭代步骤，并指出了利用间隙单元进行分析的特点。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。