三次标准B样条

一个abaqus梁单元的UEL，配套了理论和inp文件，可以完美运行(A abaqus UEL beam element, supporting the theory and inp file, you can run perfectly)

matlab与fortran 动态链接，混合编程(matlab and fortran dynamic link, mixed programming)

使用奇异值分解来帮助求解最小二乘问题，特别是在方程系数矩阵不满秩的情况下。(SGELSD computes the minimum-norm solution to a real linear least * squares problem: * minimize 2-norm(| b- A*x |) * using the singular value decomposition (SVD) of A. A is an M-by-N * matrix which may be rank-deficient.)

Fortran95实例程序，与Fortran95程序设计配合！(source codes written by fortran95)

说明：  3维hashin失效准则~复合材料层合板(3-D Hashin Failure Criterion ~Composite Laminates)

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：  线弹性模型,该模型可以用于abaqus的子程序调用(Linear elastic model)

基于PSCAD/EMTDC搭建的CIGRE HVDC改进模型，仿真电压、电流图形比原模型的波形要稳定。(Based PSCAD/EMTDC built CIGRE HVDC improved model simulation voltage and current waveforms graphics than the original model to be stable.)

液体径向轴承有限差分求解雷诺方程已经油膜刚度和阻尼等动态特性

这个是计算声传播的各种模型 包括简正波kraken波数积分scooter等模型 有很好的学习价值 (a system program for acoustic propagation calculation)