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Description: 一维伽辽金型无网格法MATLAB程序
无网格方法采用基于点的近似，可以彻底或部分地消除网格，不需要网格的初始划分和重构，不仅可以保证计算的精度，而且可以大大减小计算的难度。然而，由于目前的无网格近似一般没有解析表达式，且大都基于伽辽金原理，因此计算量很大，要超出传统的有限元法；另外，无网格近似大都是拟合，因此对于位移边界的处理比较困难，多采用拉格朗日乘子法处理。-1维伽Galerkin-type meshless method MATLAB procedures meshless method based on the point of approximation, can be completely or partially eliminate the grid, the grid does not require the initial division and reconstruction, not only can guarantee the accuracy of the calculation, and can greatly reduce the difficulty of calculation. However, due to the current meshless approximation there is no analytic expression in general, and mostly based on the Galerkin principle, the calculation of a large volume, it is necessary to go beyond the traditional finite element method In addition, the meshless approximation are fitted, so displacement of the border more difficult to deal with, the use of Lagrange law.
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Author: dong |
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Description: 求算非线性最小二乘问题的经典算法。Levenberg-Marquardt算法。-This is levmar, a copylefted C/C++ implementation of the Levenberg-Marquardt non-linear
least squares algorithm. levmar includes double and single precision LM versions, both
with analytic and finite difference approximated jacobians. levmar also has some support
for constrained non-linear least squares, allowing linear equation and box constraints.
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Size: 57344 |
Author: muxihan |
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Description: This FEMM program file to use analytic finite element.-This is FEMM program file to use analytic finite element.
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Size: 3122176 |
Author: ruchao |
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Description: Implementation of the Potter head field equations.
(C) 2000, C. Bond. All rights reserved.
"Analytic Expression for the Fringe Field of Finite
Pole-Tip Length Recording Heads", Robert I. Potter,
IEEE Trans. on Mag., Vol. MAG-11, pp. 80-81,
January 1975.
The above cited paper presented an expression for
calculating the Hx field value for a thin film
head. Potter s results were used by Szczech in
a comparison with his own method (1979).
Some limitations on the method are:
1) Use of Karlquist field for central pulse,
2) Assumption of equal pole thicknesses,
3) No equation for Hy field.
Because of limitation 2), the calling conventions for this routine do not require a head geometry structure.
All relevant quantities are passed directly as function parameters, and the (normalized) Hx field value is the returned result.
-Implementation of the Potter head field equations.
(C) 2000, C. Bond. All rights reserved.
"Analytic Expression for the Fringe Field of Finite
Pole-Tip Length Recording Heads", Robert I. Potter,
IEEE Trans. on Mag., Vol. MAG-11, pp. 80-81,
January 1975.
The above cited paper presented an expression for
calculating the Hx field value for a thin film
head. Potter s results were used by Szczech in
a comparison with his own method (1979).
Some limitations on the method are:
1) Use of Karlquist field for central pulse,
2) Assumption of equal pole thicknesses,
3) No equation for Hy field.
Because of limitation 2), the calling conventions for this routine do not require a head geometry structure.
All relevant quantities are passed directly as function parameters, and the (normalized) Hx field value is the returned result.
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Size: 6144 |
Author: shengbin |
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Description: This function returns the numerical derivative of an analytic function.
Of special note, is the incorporation of the "complex stepderivative"approach which offers greatly improved derivative accuracy compared to approximations. This is especially germain when accuracy at the level of machine precision is a concern.
-Programming the finite element toolbox using matlb finite element toolbox, many examples for yourself as there is a very friendly interface, input parameters can be
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Size: 3072 |
Author: 张文荣 |
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Description: 提出了基于有限脉冲响应(FIR)模型的预测函数控制(PFC)算法,给出了采用1个基函数(阶跃函数)和2个基函数(阶跃函数、斜坡函数)的控制律的解析解,分析了闭环系统稳态特性,结果表明,系统对于设定值变化和输出扰动均无余差.结合该算法、T-S模糊建模和自适应控制技术,提出了模糊自适应预测函数控制(FAPFC)策略-Proposed based on finite impulse response (FIR) model predictive functional control (PFC) algorithm is given using a base function (step function) and two basis functions (step function, ramp function) analytic control law solution, steady-state analysis of the closed-loop system characteristics, the results show that the system output for setpoint changes and disturbances were not more than poor. combined with the algorithm, TS fuzzy modeling and adaptive control techniques proposed fuzzy adaptive predictive functional control (FAPFC ) strategy
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Author: liuda |
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Description: 有限差分法实验报告
用Matlab中的有限差分法计算槽内电位；
对比解析法和数值法的异同点；
选取一点，绘制收敛曲线；
总的三维电位图-Finite difference method for the experiment report
Matlab finite difference method for calculating the slots in the potential
Comparative analytic method and numerical method the differences and similarities between
Select a bit, draw convergence curves
General 3 d potential figure
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Size: 86016 |
Author: 小林 |
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Description: 李超+线性代数在OI中的应用与题目讲解
线性代数是数学的一个分支，它的研究对象是向量，向量空间（或称线性空间），线性变换和有限维的线性方程组。向量空间是现代数学的一个重要课题；因而，线性代数被广泛地应用于抽象代数和泛函分析中；通过解析几何，线性代数得以被具体表示。线性代数的理论已被泛化为算子理论。由于科学研究中的非线性模型通常可以被近似为线性模型，使得线性代数被广泛地应用于自然科学和社会科学中。-Lie+ linear algebra applications with the subject in the OI explain
Linear algebra is a branch of mathematics, it is a vector, the vector space (or linear space), the linear transformation and the finite-dimensional linear equations. The vector space is an important issue in modern mathematics Thus, linear algebra is widely used in abstract algebra and functional analysis able to be specifically expressed through analytic geometry, linear algebra. The theory of linear algebra has been generalized in operator theory. As scientific research in nonlinear models can often be approximated by linear models, linear algebra is widely used in the natural sciences and social sciences.
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Size: 107520 |
Author: shy |
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Description: 二维方腔流动问题是一个不可压缩黏性流动中典型流动。虽然目前尚不能求得它的解析解，但是它常被用来作为检验各种数值算法计算精度和可靠性的算例。文献中几乎大多数算法都对它进行过计算。在本算例中采用有限体积算法三阶迎风型 离散格式对它进行数值求解。-The problem is two-dimensional square cavity flow incompressible viscous flow in a typical flow. Although it is still analytic solution can not be obtained, but it is often used as a test of various numerical algorithm to calculate the accuracy and reliability of the numerical examples. Most algorithms are almost the literature it been calculated. Third-order upwind finite volume method using Discrete format in this example it solved numerically.
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Author: panda |
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Description: 经由正、负离散时间傅立叶变换表达式是信号分析的一个关键部分。
X( ) （3.9） （3.10）
当 LTI 系统用于滤波的时候，作为冲激响应离散时间傅立叶的频 率响应，提供了 LTI 系统间接的描述。离散时间傅立叶变换 X（ ）是 w 的周期复值函数，周期总是 2π，并且基周期通常选在区间[-π，π] 上。对离散时间傅立叶变换 DTFT 来说有两个问题： 1. DTFT 的定义对无限长信号是有效的。 2. DTFT 是连续变量 w 的函数 在 MATLAB 中， 任何信号 （向量） 必须是有限长度的， 所以 DTFT 无法用 MATLAB 直接计算。当能从变换定义式推导出解析式并计算 它时， 可以用 MATLAB 计算。 第二个问题是频率抽样问题。 MATLAB 擅长在有线网络点上计算 DTFT，通常选足够多的频率以使绘出的图 平滑，逼近真实的 DTFT。3.计算DTFT需要两个函数，MATLAB的freqz函数计算无限长信号，dtft（h，H）函数计算有限长信号的DTFT。-Passive and negative discrete Fourier transform expressions are a key part of signal analysis.
X () (3.9) (3.10)
When the LTI system is used for filtering, the frequency response of the discrete time Fourier as an impulse response provides an indirect description of the LTI system. Discrete time Fourier transform X () is the periodic complex function of w, the period is always 2π, and the base period is usually selected in the interval [-π, π]. There are two problems with the discrete-time Fourier transform DTFT: 1. The definition of DTFT is valid for infinite length signals. 2. DTFT is a function of continuous variable w In MATLAB, any signal (vector) must be finite length, so DTFT can not be directly calculated using MATLAB. When you can derive the analytic the transformation definition and calculate it, you can use MATLAB to calculate. The second problem is frequency sampling. MATLAB is good at calculating DTFTs at wired network points and usually selecting enough frequen
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Size: 13312 |
Author: 张丽丽 |
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