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Read e-book online An introduction to structural optimization (Solid Mechanics PDF

By Peter W. Christensen

ISBN-10: 1402086652

ISBN-13: 9781402086656

This textbook supplies an creation to all 3 sessions of geometry optimization difficulties of mechanical buildings: sizing, form and topology optimization. the fashion is particular and urban, concentrating on challenge formulations and numerical answer tools. The remedy is exact sufficient to let readers to put in writing their very own implementations. at the book's homepage, courses might be downloaded that extra facilitate the educational of the cloth coated. The mathematical necessities are saved to a naked minimal, making the e-book compatible for undergraduate, or starting graduate, scholars of mechanical or structural engineering. working towards engineers operating with structural optimization software program could additionally take advantage of studying this e-book.

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Additional resources for An introduction to structural optimization (Solid Mechanics and Its Applications)

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L ⎪ ⎩ x ∈ X = {x ∈ Rn xjmin ≤ xj ≤ xjmax , j = 1, . . , n}, where K(x) is the global stiffness matrix of the structure, u is the global displacement vector, and F (x) is the global external force vector. It is certainly possible to solve (SO)sf directly, but there is major disadvantage with the simultaneous formulation for large-scale problems—the number of constraints due to the equilibrium equations is huge. In case the stiffness matrix is nonsingular, we may use the equilibrium equations to write the displacements as functions of the design variables: u(x) = K −1 (x)F (x).

8. Chapter 3 Basics of Convex Programming The solution procedure of the previous chapter relies crucially on the ability to easily identify what constraints are active at the solution of the optimization problem under study. This works fine for problems with only two design variables, but when trying to solve real-life problems, where the number of design variables may vary from the order of 10 to the order of 100 000 or more, one needs more systematic solution methods. In this and the following chapter we will study methods from the field of mathematical programming that are applicable for large-scale problems.

Then f is (strictly) convex if and only if the gradient ∇f is (strictly) monotone. 2 Convexity 39 Here, a function g : S → Rn is monotone on S if for all x 1 , x 2 ∈ S with x 1 = x 2 it holds that (x 2 − x 1 )T (g(x 2 ) − g(x 1 )) ≥ 0. Similarly, g is strictly monotone on S if strict inequality holds here. This definition is a generalization of the concept of a monotonically increasing function of one variable: g is monotonically increasing if x2 > x1 implies that g(x2 ) ≥ g(x1 ). 2 The function f : R → R, f (x) = x 4 , is strictly convex on R since ∇f (x) = 4x 3 is strictly monotone on R: (x2 − x1 )(x23 − x13 ) = (x2 − x1 )2 (x12 + x1 x2 + x22 ) = (x2 − x1 )2 1 x1 + x2 2 2 3 + x22 > 0, 4 x1 = x2 .

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An introduction to structural optimization (Solid Mechanics and Its Applications) by Peter W. Christensen

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