chrip

迭代的动力缩聚法计算结构的前两阶频率和阵型（4个自由度）(Iterative dynamic condensation method to calculate the structure of the first two natural frequencies and formation (4 degrees of freedom))

begining of UMAT in abaqus

这是利用C++ 编的fft(This is the C series fft)

说明：  PoleyFitqw曲3线3拟w合类q库 PolewyFitqw曲w线拟w合t类库 PoelywFitq曲w线拟t合类t库 PoelyFtitq曲er线rw合类t库 PolywrFitq曲q线拟wt合t类库(Pwoly33FiwtPoleetPwolyFit555PolywFit)

相场法基础书籍的配套计算代码，对于学习相场法的基础同学来说极其有用(The supporting calculation code of the phase field basic book is extremely useful for the students who are studying the basic method of the phase field method.)

考虑直齿轮热弹耦合，计算啮合刚度及齿轮摩擦热(To thermoelastic coupling calculation consider spur gear meshing stiffness and gear frictional heat)

用Python语言写的多目标进化算法库（2017年最新版本），包含常见的多目标进化算法以及当前最新文献中的最新算法，能够实现不同算法之间的性能比较（包含常见的GD, IGD, HV等评价指标自动生成）。可以供进化计算、多目标优化、单目标优化算法的学习参考。Python语言版本简单易懂，实用性强。(Library of multi-objective evolutionary algorithm written in Python language (the latest version in 2017), including multi-objective evolutionary algorithm and the most common new literature in the new algorithm, can realize the performance between different methods (including the common GD, IGD, HV and other evaluation index generation). It can be used as a reference for evolutionary computation, multi-objective optimization and single objective optimization. Python language version is simple and easy to understand, practical.)

本程序是用节点导纳矩阵计算三相短路电流 输入数据--形成节点阻抗矩阵--选择故障点---计算短路电流----计算个节点电压---计算指定支路的电流(this procedure is used node admittance matrix calculation of three-phase short-circuit current input data-- forming node impedance matrix-- election Optional fault--- calculation of short-circuit current-voltage computing nodes designated calculated slip road--- Electricity)

计算磁铁在线圈经过时，感生电压和磁铁位置的关系，即电磁感应系数(when a magnet passes by a coil, to calculate the induced voltage)

本书由美国数学大师大师编写的数学计算这本书，很经典。国内的书编写残次不齐(This book is authored by American mathematician Mathematical calculation ,It is a good book)