新建压缩(zipped)文件夹

平面波或锥形波照射任意粗糙面，用基尔霍夫近似方法的散射计算(Kirchhoff scattering rough surface)

说明：  一个基于有限元方法的平面问题求解器，支持网格类型为二维四边形四节点单元和四边形八节点单元的有限元网格： 前处理——用Abaqus建模编号并导出数据 在Matlab中读取数据文件 计算单元刚度矩阵（采用高斯积分），组集结构刚度矩阵 组集结点载荷向量，引入位移边条 求解结点位移，单元应力应变 后处理——绘制应力应变位移云图，与Abaqus结果对照(A plane problem solver based on finite element method)

说明：  导入matlab后添加另一个gearsolve函数，使用ode45进行t为0.001：0.001：1000和刚度ky数组，即可获得齿轮组的全自由度运动图像(After importing MATLAB, add another gearsolve function, use ode45 to do t = 0.001:0.001:1000 and stiffness KY array, then the full degree of freedom motion image of gear set can be obtained)

激光器处于注入锁定稳态时，失谐频率和注入比的关系研究(Study on the relationship between the detuning frequency and the injection ratio when the laser is in the locked steady state)

利用matlab软件的Curve Fitting工具对声速剖面进行拟合，仿真其真实情况，同时对三维数据进行了仿真拟合。(The sound velocity profile was fitted by the Curve Fitting tool of Matlab software, and the real situation was simulated. At the same time, the three-dimensional data was simulated and fitted.)

说明：  通过matlab仿真偶极子声场的指向性，在极坐标下作图画出指向性(The directivity of dipole sound field is simulated by MATLAB, and the directivity is drawn in polar coordinates)

平面波从空气入射到石英玻璃中的P、S分量的能流反射率和透射率(Energy flow reflectivity and transmissivity of plane wave from P to S in the quartz glass.)

实现快速分数阶傅里叶变换功能。分数阶傅里叶变换是整数傅里叶变换的普遍形式，可用于光的菲涅尔衍射模拟。(The function of fast fractional Fourier transform is realized. Fractional Fourier transform is a general form of integer Fourier transform, which can be used to simulate Fresnel diffraction of light.)

说明：  超短脉冲在光纤中传输产生各种非线性效应，影响因素包括激光器的高斯脉冲，本模拟是初始啁啾脉冲的脉冲形状。(The transmission of ultrashort pulses in optical fibers produces various non-linear effects. The influencing factors include the Gaussian pulse of the laser. This simulation is the pulse shape of the initial chirped pulse.)

用数值求解一阶贝塞尔函数的前10个零点并作出曲线(Numerical solution of the first-order Bessel function of the top 10 zero point and make a curve)