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Then the boundary element integral equation of interior and exterior form is deduced in detail, also the form with corner coefficient. The significance for numerical calculation and principle of the singular integral is analyzed, and a non-isoparametric transformation method is presented to calculate weak singular integral and Cauchy integral, the method presented provides us a very simple way to computer the two kinds of singular integral of Helmholtz boundary integral equation, and it is easy to program in computer. After the difficulty of the calculation for multi-frequency of Helmholtz boundary element is explained, a method named SECHIEF (Series Expansion Combined Helmholtz Integral Equation Formulation), which is focused on the computational efficiency, is presented.

对结构声辐射的边界积分方程的内部形式与外部形式进行了详细的推导,给出了角点系数的计算方法与边界积分方程的形式,在此基础上,分析了奇异积分产生的原理及其对数值计算的重要性,提出了一种计算奇异积分的非等参(来源:Ae8a8BC论文网www.abclunwen.com)单元的变换方法,该方法给Helmholtz 声学边界积分方程中的弱奇异积分与Cauchy 奇异积分的计算以及编程提供了极大便利。

In order to find a stable approximate solution of linear compact operator equation, the article introduces general theories about ill-posed problems, it bases on spectral theory of self-adjiont compact operators and the singular value decomposition for compact operators, avails singular system to give expression of the solution, and explains ill-posedness of compact operator equation roots in the property that the singular values trends to zero. Thereout, it is provided with theoretic support of building up regularization method by inducting regularization filter to weaken or filtrate the influence that the nature of the singular value being very close to zero has on the solutions stability.

为了得到线性紧算子方程稳定的近似解,介绍了不适定问题正则化的一般理论,以自伴紧算子的谱分析与紧算子奇异值分解为理论基础,利用奇异系给出了解的表达式,说明了紧算子方程不适定性的根源在于紧算子的奇异值趋于零的性质,由此通过引入正则化滤子函数来减弱或滤掉奇异值趋于零的性质对解的稳定性的影响,构造正则算子,从而提供了建立正则化方法的理论依据。

In the method, two diagonal matrixes will be assisted in SVD matrix, which will be decomposed into several plot matrixes.

提出了一种新的基于奇异值分解的GM(1, 1),GM(1, N)等灰色模型参数估计方法,该方法在进行奇异值分解时,借助2个辅助矩阵将奇异值分解矩阵分解为多个矩阵之积。

A time domain singularity extraction technique is presented to calculate singular integrals in time domain electric field integral equation solver.

介绍了一种基于奇异提取技术的时域积分方程中奇异积分的处理方法,在奇异提取过程中,电磁波传播的延迟效应对积分的贡献包含在内。

SVD is the general method for linear decomposition of a matrix into independent principal components, and is a form of Eigenvalue-Eigenvector analysis or principal components decomposition and, in a more general sense, of multi-dimensional scaling.

SVD分解根据矩阵的运算计算出矩阵的奇异值,然后根据奇异值计算出矩阵的两个奇异矩阵,将矩阵分解为三个矩阵的乘积形式。

In this paper we suggesst a finite element method for singular two point boundary value problems with singular solution by introducing singular basis with local support.

采用具有小支集的奇异基函数的有限元方法求解奇异两点边值问题的奇异解。

The examples given have proved the advantage of the Boundary Element Method. In the analysis of the fracture mechanics using Boundary Element Method, the calculation model of one-quarter singular element has been established, and has been proved its validity.

把边界元法应用于线弹性结构断裂分析中,建立了裂尖奇异区分析的四分之一奇异元计算模型,算例表明,用四分之一奇异元分析断裂力学问题是一种有效的逼近裂尖场的数值方法。

The singular values of the project can be used as the character vector. The singular values of the scaling invariant can be obtained by the statistical characteristics of Radon transform. Since the singular values of the matrix are uncorrelated with the position of the column or the row of the matrix. In this way, the character vector of singular values with shift, scaling and rotational invariant is arrived at by this algorithm.

针对各颜色分量,利用Radon变换的奇异值的统计特性提取了具有尺度不变性的奇异值,由于矩阵的奇异值分解具有旋转不变性,因此该奇异值为平移、尺度和旋转不变的特征向量。

In section 3, on the base of the iterative algorithm, we obtain a new iterative algorithm which is convergent to the signal faster than the old one. In section four, if the form of φ is simple and the sampling set is the integer set Z, then a direct reconstruction formula is presented.

在第二节,我们通过计算对偶框架来重建信号,这与传统的计算对偶框架方法不一样,该算法是通过计算一个矩阵的逆矩阵来计算对偶框架,当矩阵是奇异矩阵时,可通过奇异值分解方法或截断奇异值分解算法来求矩阵的广义逆矩阵。

There should be mesons consisting of strange quarks in the strange hadronic matter besides hyperons with a nonzero strangeness.

奇异强子物质中不仅包含奇异数S≠0的超子,还应该包含由奇异夸克组成的介子。

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