grid exchange

This matlab code includes the solution for root off a polynomial by Bairtow method .....

关于移动温度载荷，这里是它的瞬态分析的ansys例子，大家共同进步(a program for moving temperature in ansys)

北航CFD大作业，计算一个二维管流的流动参数，使用有限体积法(In the big operation of CFD, we calculate the flow parameters of a two-dimensional pipe flow by using the finite volume method.)

本程序用于气象探测设备风廓线数据的处理，用于计算不同高度的风暴螺旋度（SRH），输入输出均为文本格式。本程序为本人亲自编写，调试通过并已应用。可用于装备风廓线的气象等部门。(The procedure for processing meteorological equipment wind profile data used to calculate the height of the storm in different helicity (SRH), both input and output text format. This program is personally write, debug, and has been applied by. Weather and other equipment can be used for wind profiler department.)

一篇小论文，转子动力学方面多耦合结构研究，是一篇值得研究的论文，题目为椭圆轴承-转子系统的稳定性与分岔。(A small paper, the dynamics of multi-rotor coupling structure, is a worthy research paper, entitled elliptical bearing- Rotor System Stability and bifurcation.)

交通移动荷载，ABAQUS子程序，使用fortran语言编写，模拟车轮运动。(Traffic moving load, ABAQUS subroutine, using FORTRAN language to simulate wheel movement.)

Fortran常用算法程序集－第二版.pdf，很全的算法程序集，对提高Fortran编程能力大有帮助。(Fortran common algorithm assembly- Second Edition. Pdf, is the whole assembly algorithms, to improve the Fortran programming skills go a long way.)

ABAQUS中用户材料子程序UMAT的开发主要解决两方面的问题：本构模型的建立和积分算法的选择。 本文主要研究非线性材料的UMAT实现方法，并重点研究其迭代算法部分，目前，用户材料子程序UMAT的迭代算法主要是常刚度法，常刚度法的优点在于算法原理较简单，程序编写较方便，缺点是当遇到复杂非线性材料时，其迭代次数较多，收敛速度也较慢，在这个情况下，本文采取的是一种迭代次数较少且收敛速度较快的切线刚度法，具体就是采用FORTRAN语言编制了基于Von-Mises模型的接口程序,并采用切线刚度算法，通过与ABAQUS自带本构关系计算的结果相比较，验证其正确性。(This paper studies the user subroutine UMAT of ABAQUS development methods, the use of FORTRAN language isotropic hardening material model of the interface program, studied the effects of such material is extremely elastic-plastic constitutive relation method. This article UMAT tightly around the secondary development of technology, the first principle of its interface detail, and then for the theory of nonlinear finite element incremental stiffness of the regular tangent stiffness method and the theory of algorithms to do an in-depth analysis of deduced a regular tangent stiffness and rigidity of the law of the specific expression of algorithm theory, and then the preparation of the two algorithms, respectively, of the UMAT program, and finally the establishment of a specific model checking, bringing with ABAQUS elasto-plastic constitutive relation of the calculated results compared to verify the correctness of the two.)

圆轴承油膜力计算程序，包含动态油膜力和静态油膜力，可用于转子动力学分析(Round bearing oil film force calculation program, including the dynamic oil film force and static oil film strength, can be used for rotor dynamics analysis)

可以用于在ABAQUS中进行蠕变损失分析(For creep rupture analysis in ABAQUS)