mathmatic

主要用于振动信号的频谱分析，用于判断信号中的故障频率(the fft analysis of the vibration signal)

运用BESO方法实现MBB梁的一体化拓扑优化(The BESO method is used to optimize the integration topology of MBB beam)

提取中尺度WRF模式指定高度处的风向时程(To extract time series of wind direction at specific height)

叠前时间偏移代码，fortran格式，可以用于三维地震数据处理，可以在此基础上进一步完善其应用范伟。(Kirchhoff time migration code fortran version)

多次改进的seis系列传统正演源程序seis88，仅供参考。(for ray tracing use.)

四分之一车辆模型，可以应用改模型进行车辆模拟仿真(Four vehicle models can be used for vehicle simulation.)

说明：  refprop9.1是一款用于制冷剂物性查询软件，可用于工质参数的调用(RefProp 9.1 is a refrigerant physical properties query software, which can be used to call refrigerant parameters.)

说明：  金蝶官方的CRM二次开发文档，主要是基本开发的讲义，PPT格式。没做过CRM二开的，有一定指导作用。(Kingdee's official CRM two development document, mainly the basic development of the lecture, PPT format. Did not do CRM two open, have a certain guiding role.)

说明：  这是一个用codesys做的电子凸轮简单例程，用于入门codesys.(This is a simple routine of electronic cam made by CoDeSys, which is used to start CoDeSys)

实现弧度向角度的转换，判断在第几象限。。。。。。(Realize the conversion of radian to angle and judge the quadrant)