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

By Peter W. Christensen

ISBN-10: 1402086652

ISBN-13: 9781402086656

This textbook provides an creation to all 3 sessions of geometry optimization difficulties of mechanical buildings: sizing, form and topology optimization. the fashion is specific and urban, concentrating on challenge formulations and numerical answer tools. The remedy is particular adequate to allow readers to put in writing their very own implementations. at the book's homepage, courses can be downloaded that additional facilitate the educational of the cloth coated. The mathematical must haves are stored to a naked minimal, making the ebook compatible for undergraduate, or starting graduate, scholars of mechanical or structural engineering. working towards engineers operating with structural optimization software program may additionally reap the benefits of analyzing this booklet.

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

Example text

The function f : R2 → R, f (x1 , x2 ) = x1 x2 is neither convex nor concave. By applying the definitions of convex sets and functions, one easily obtains the following lemma. 1 (i) The set S = {x ∈ X : gi (x) ≤ 0, i = 1, . . , l} is convex if the functions gi : Rn → R, i = 1, . . , l are convex. (ii) Let S be a convex set. If f : S → R and g : S → R are convex and h : S → R is strictly convex, then αf is convex, where α ≥ 0 is an arbitrary scalar, f + g is convex and f + h is strictly convex.

I | ≤ σimax , i = 1, 2, 3. 28) The equilibrium equation is found by cutting out the free node as shown in Fig. 11. The equilibrium equations in the x- and y-directions become s2 −s1 − √ + F = 0, 2 s2 s3 + √ = 0. 2 In matrix form these equations read F 0 = 1 0 √1 2 − √1 2 ⎤ s1 ⎣ s2 ⎦ −1 s3 0 ⎡ ⇐⇒ F = B T s. 29) Note that in contrast to the two-bar truss in Sect. 3, we cannot obtain the bar forces from the equilibrium equations alone since the number of bars exceeds the number of degrees-of-freedom.

L are convex. (ii) Let S be a convex set. If f : S → R and g : S → R are convex and h : S → R is strictly convex, then αf is convex, where α ≥ 0 is an arbitrary scalar, f + g is convex and f + h is strictly convex. If both the objective function and the feasible set of (P) are convex, the problem is said to be convex. The lemma above then states that (P) is convex if the objective function and all constraint functions gi , i = 1, . . , l, are convex. As previously mentioned, local minima are also global minima for convex problems.

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


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