干旱指标SPI

离散元程序PFC中的一个小案例-结构动力模拟，能够模拟地震作用下，结构的动力响应(DYNAMIC SIMULATION OF DISCRETE ELEMENT PFC STRUCTURES)

梯形断面明槽水面曲线计算源程序,输入数据即可自动计算结果(Calculation of Water Surface Curve of Trapezoidal Section Open Channel)

说明：  求振动信号功率谱的两种代码，一种周期法，一种AR_pyuler法，支持Excel和text读取(Two codes for calculating the power spectrum of vibration signal)

diff 2 for stationary data

说明：  针对轨道动力学，模拟轨道不平顺的matlab编程，对轨道增加不平顺性，美国六级谱(Addition of track irregularity)

abaqus的残余应力数值模拟源文件，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)

铝合金门窗辅助设计营销。输入门窗洞口尺寸，系统自动打印下料单、玻璃单、示意图、收银……(Aluminum alloy doors and windows aided design marketing. Input the size of the door and window opening, the system automatically prints the blanking list, glass sheet, schematic diagram, cash register...)

说明：  双线性滞回模型，单自由度结构的地震时程分析(Bilinear hysteretic model, seismic time history analysis of single degree of freedom structure)

3维米塞斯屈服准则模型，子程序为vumat，用于abaqus(ABAQUS 3-dimensional Mises yield criterion)

说明：  该文档为双块式无砟轨道建模命令流，该命令可用于ansys平台运行(This document is the command flow for modeling the double block ballastless track)