crackprop_modeI_lefm_xfem_cpe4

对信号进傅里叶变换，得到振幅谱和相位谱，并可画出振幅谱和相位谱。(The signal into the Fourier transform, the amplitude spectrum and phase spectrum and amplitude spectrum and phase draw spectrum.)

三角网格以及矩形网格剖分. 实现等参单元以及误差L H 范数收敛阶估计.(Triangular meshes and rectangular meshes are subdivided to achieve convergence order estimation of error L H norm.)

CG共轭梯度法迭代解矩阵方程，Hhestens和Stiefel给出，(Conjugate gradient method CG iterative matrix equation solution, Hhestens and Stiefel given)

对互谱法被动测距的原理及算法各个环节进行仿真验证：加权最小二乘估计中权系数的选取；相关窗长度的选取；各频段综合方法等等。最后实现了对9000m—15000m距离的测距(Cross-spectral method for passive ranging all aspects of theory and algorithms for simulation: weighted least squares estimation of the right of the selection coefficient related to the length of the selection window an integrated approach to the various bands and so on. Finally realize the right of ranging from 9000m-15000m)

LU decomposition program.

说明：  PRP共轭梯度法优化计算，采用FORTRAN语言(PRP conjugate gradient method optimization, the use of FORTRAN language)

修正剑桥模型在不排水条件下的源程序，很有用，是最近做项目是研究的课题。(cambridge with fortran)

abaqus中的三微裂纹扩展，一起学习下(the abaqus of three micro-crack propagation, with learning under)

说明：  利用五点差分格式和Jacobi迭代法，求解精确解和数值解的误差，判断阶数是否正确(Five-point difference scheme and Jacobi iteration method are used to solve the error between exact solution and numerical solution and to judge whether the order is correct or not.)

应用MATLAB编写的偏最小二乘法程序,且具有画图功能(MATLAB prepared by partial least squares procedure, which is drawing functions)