quadrotorsimplesuper

利用for语言精确模拟混凝土的全过程弹性本构(Accurate simulation of the whole process of elastic constitutive of concrete by for language)

关于simple算法，希望站长能够让小弟加入这个学习的行列。(on simple algorithms, hoping to let the younger station to join the ranks of the study.)

共轭梯度法（Conjugate Gradient）是介于最速下降法与牛顿法之间的一个方法，它仅需利用一阶导数信息，但克服了最速下降法收敛慢的缺点，又避免了牛顿法需要存储和计算Hesse矩阵并求逆的缺点，共轭梯度法不仅是解决大型线性方程组最有用的方法之一，也是解大型非线性最优化最有效的算法之一。 在各种优化算法中，共轭梯度法是非常重要的一种。其优点是所需存储量小，具有步收敛性，稳定性高，而且不需要任何外来参数。(Conjugate gradient method (Conjugate Gradient) is between the steepest descent method between the method and Newton' s method, it takes only a first derivative information, but to overcome the steepest descent method convergence slow shortcomings, but also to avoid the Newton method needs to be stored Hesse and disadvantages of computing inverse matrix and the conjugate gradient method is not only one of the most useful methods to solve large linear equations, solution of large-scale nonlinear optimization is one of the most effective algorithm. In various optimization algorithm, conjugate gradient method is a very important one. The advantage is that a small amount of memory required, with step convergence, high stability, and does not require any external parameters.)

求解非线性不动点方程组x=G(x)的非线性塞德尔迭代方法，初值x0(For solving nonlinear fixed point equation x = G (x) the nonlinear Seidel iterative method, initial value x0)

说明：  最小二乘法拟合曲线的一个小程序，采用C++程序，(Least-squares fitting curve C++ program)

该损伤模型通过 商用有限元软件ABAQUS /Explicit 的用户子程序VUMAT 实现，并使用该模型对碳纤维增强环氧树脂 复合材料层合板在横向低速冲击作用下的损伤和变形行为进行预测分析． 数值仿真的结果与试验结 果进行了比较，吻合良好，验证了该模型的有效性．(Through coding user subroutine VUMAT of finite element software ABAQUS /explicit， and applied the model to an example，carbon fiber reinforced epoxy composite laminates under low velocity impact，the prediction for damage and deformation were good agreement with the experimental results．)

计算多材料单元平均应力应变,用于提取计算等效弹性模量 泊松系数(Calculate the average stress-strain of multi-material elements)

内点法求解线性规划问题； 通过内点法实现了线性规划问题的求解； 内有说明文件；(Interior point method for solving linear programming problems through the realization of the interior point method for solving linear programming problem there is documentation )

滑动轴承接触滑块的计算方法，给定雷诺方程和膜厚方程，然后用迭代方法计算压力分布和膜厚分布，以及承载能力(The calculation method of the sliding bearing contact with the slider, a given Reynolds equation and the film thickness of the equation, and then calculated using iterative methods pressure distribution and film thickness distribution, as well as carrying capacity)

用追赶法求解三对角方程组。在输入文件中读入矩阵和列向量，程序会在结果文件中返回结果。(Solving Three Diagonal Equations by Catching)