有限元法

Structural reliability usually is analyzed in Descartes coordinates in which the correlated random variables should be converted to uncorrelated random variables by an orthogonal transformation method.

针对正交空间内，对相关随机变量的可靠指标求解时，需要做正交变换的缺点，研究了广义随机空间内结构可靠指标的计算方法，首次提出了广义随机空间内结构可靠指标计算的随机有限元法。

Although the relatively accurate model could also be obtained by finite method, reduction of the model and unsuitability of the control law design restrict the use of the method.

采用有限元法虽然也可得到对象的较为精细的数学模型，但是存在降阶任务重不适合控制律设计等问题。

Based on the Hamiltons principle and the displacement variation principle, one-dimensional discrete finite element method is developed for vibration analysis of thin-walled members.

对于动力分析部分，概述了Hamilton原理，并由位移变分原理出发推导出考虑剪力滞效应的薄壁杆件振动的一维离散有限元法。

The problem of uniqueness in 3D electromagnetic field computation using magnetic vector potential A as the variable is studied in this paper.

本文结合具体的工业课题，主要进行了棱边有限元法的基础理论及其在三维非线性涡流场及损耗问题中的应用研究。

Vertical vibration analysis model for vehicle/track coupling system is developed by means of finite element method.

利用有限元法，建立了车辆-轨道耦合系统竖向振动分析模型。

Using the finite element method to calculate the bandgap semiconductor structure and the wave function.

采用有限元法计算半导体的带隙结构和波函数。

The linear method being used to calculate the critical wind speed of aerostatic stability by national guideline is expatiated.

提出了基于ANSYS的计算大跨径桥梁静风稳定性的非线性有限元法，充分考虑了结构的几何非线性及静风荷载的非线性。

In this paper,a method for computation of aerostatic stability of long span bridge s,the nonlinear finite element method,is put forward.

提出一种计算大跨径桥梁静风稳定性的方法——非线性有限元法，这种方法基于ANSYS，充分考虑了结构几何非线性及静风荷载非线性的影响。

A time domain differential equation model is established by using the axisymmetrical form of the Maxwell's equations,and the finite element time domain method is applied to solve the model.

使用麦克斯韦方程组的轴对称形式建立时域微分方程数学模型，应用时域有限元法求解，给出了数值算例，模拟了在不同缺陷参数下涂有电介质的导体对入射脉冲太赫兹波的响应，并归纳了响应在空间上和时间上的变化规律。

Moreover on principle of choosing road material, it is necessary to seek optimal combination of performances between mechanics and calorifics.

本文以内蒙古301国道为依托，通过对岛状多年冻土分布的勘探和对道路病害进行调查，分析了道路病害产生的原因，并有针对性的采取各种改善措施；建立了二维非稳态具有相变热传导方程，采用有限元法分析了坡度、高度和填料等因素对道路热稳定性的影响，并结合试验路和室内试验，首次系统提出了在岛状冻土地区道路路基路面设计方法，同时认为在多年冻土筑路材料选择的原则上，应寻求力学性能、热学性能的最佳组合。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。