fortran 样条插值法 线性方程求解 高斯约当

带有裂缝的动力分析模型，采用abaqus软件建模(Dynamic analysis model with cracks, software modeling using abaqus)

The model used for creating the reference voltage is shown in Fig. 4. First, photovoltaic output current (Ipv) and output voltage (Vpv) are passed through a first order low pass filter with a magnitude of G = 1 and a time constant of T = 0.01 seconds in order to filter out the high frequency components or harmonics from these signals as shown in Fig. 5 and Fig. 6. The filtered current and voltage signals (Ipv_F and Vpv_F) are then fed into the MPPT control block that uses the Incremental Conductance Tracking Algorithm. An algorithm that is based on the fact the slope of the PV array power curve shown in Fig. 7 is zero at the Maximum Power Point (MPP), positive on the left of the MPP, and negative on the right. The MPP can thus be tracked by comparing the instantaneous conductance (I/V) to the incremental conductance (∆ I/∆ V) [11] as in (1):

说明：  cohesive的vumat程序与文章A concise interface constitutive law for analysis of delamination and splitting in composite materials and its application to scaled notched tensile specimens有关(Cohesive VUMAT program)

老外的程序，可以计算二维各向异性地震波场传播过程(The program can calculate the propagation process of two-dimensional anisotropic seismic wave field)

用Fortran编程求解简单的一元二次方程案例(Solving quadratic equation of one variable)

its about islanding detection

五对角矩阵追赶法求解矩阵，有调用方法，并且经过我优化，一次性将矩阵处理成五对角数列，减少循环次数(Pentadiagonal matrix chase method for solving the matrix, there is a method call, and after I optimized one-time matrix processing into PENTADIAGONAL series, reducing the number of cycles)

王勖成的《有限单元法》资料包，包括pdf书籍、课后习题答案以及有限元分析教学程序FEATP源码！(The package of finite element method by Wang Xucheng, including pdf books, after-school exercise answers and finite element analysis the teaching programFEATP source!)

HVDC经典模型，PSCAD搭建，可以自己修改参数(HVDC classic model, PSCAD build, you can modify the parameters yourself)

帮助umat学习者快速入门，并且详细理解umat的内在运行机制(Umat help learners QuickStart, and a detailed understanding of the inner workings of the mechanism umat)