干旱指标SPI

说明：  该程序可进行2D和3D恒定流分析，程序中对矩阵含义和比较难理解的部分进行了简要说明(The program can be used for 2 D and 3 D constant flow analysis. The meaning of matrix and the parts that are difficult to understand are briefly explained in the program)

说明：  计算简单管道当阀门关闭时管道内的水锤压力。(Calculate the water hammer pressure in a simple pipe when the valve is closed.)

说明：  程序考虑了悬臂梁的几个大变形，并给出了变形过程图，很适合非线性学习的初学者。(The program considers several large deformations of the cantilever beam, and gives the deformation process chart, which is very suitable for beginners of nonlinear learning.)

说明：  可利用八节点有限单元进行力学分析，荷载形式可以为点荷载或均布荷载等形式(This code can be used for mechanical analysis of eight-node quadrilateral element, and it is suitable for various load forms such as concentrated load, uniform load and so on.)

说明：  abaqus VUMAT子程序,用于复合材料hashin-3D失效准则，只能用于abaqus/explici求解器(subroutine for abaqus/explicit)

说明：  用于房屋、大坝、桥梁、水电站等大型结构的时程分析，根据桥梁抗震细则规范标准谱得到的25条地震波(For time history analysis of large structures such as buildings, dams, bridges and Hydropower stations, 25 seismic waves are obtained according to the standard spectrum of seismic rules for bridges.)

说明：  徐世良经典算法集合，包含常用的各种算法，供大家下载参考(index for FEM code)

说明：  四参数建模，matlab编写，用于多孔介质，煤炭，岩石等(Four parameter modeling, matlab preparation, for porous media, coal, rock, etc)

说明：  MATLAB 脚本的振型叠加计算内容， 属于结构动力学的内容，为英国大学教授的教学脚本(SDOFof superposition worked exampleSDOF)

说明：  abaqus的平板塑性圆孔数值模拟源文件，适合abaqus新手操作练习使用(ABAQUS source files for numerical simulation of plate constraints, suitable for ABAQUS novice operation exercises)