tailieunhanh - Ebook Finite element method: Part 2

(BQ) Part 2 book "Finite element method" has contents: Vibrational principles, galerkin approximation and partial differential equations, isoparametric finite elements, selected topics in finite element analysis. | Chapter 5 Variational Principles Galerkin Approximation and Partial Differential Equations . INTRODUCTION The fundamental numerical method of analysis utilizing finite elements has been developed in previous chapters with elementary elements and formulations of problems and basic equations of mathematical physics and engineering. In this chapter a more fundamental development of variational principles will be presented. The reader who is familiar with the mathematical structure of variational principles but unfamiliar with applications to finite element analysis will find detailed examples in terms of applications. For the reader who is unfamiliar with the mathematics of functional analysis and vector spaces the examples are intended to translate mathematical concepts into more meaningful applied situations. In either case several references are given in the bibliography that can be consulted for additional reading. The Galerkin method of numerical analysis is introduced and is emphasized in this chapter. Examples illustrating the mathematical method will aid the reader in understanding fundamental concepts referred to as weighted residual methods. Detailed examples are intended to illustrate application of the Galerkin method for deriving local finite element models. The Galerkin method is a more powerful tool for finite element analysis than the variational method because almost any physical problem described by one or more differential equations can be modeled using this technique. Variational principles do not exist for all physical problems however mathematical results proving that a variational formulation either does or does not exist can tell the analyst more about the fundamental mathematical structure of a problem than the Galerkin method. These issues are of an advanced nature and beyond the scope of this book. The finite element method will be extended to coupled partial differential equations in this chapter. The equations of elasticity of Chap. 3 .

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