Journal ArticleDOI
Some contributions to optimal design using explicit behaviour models
H. P. Mlejnek,P. Schmolz +1 more
TLDR
For shape optimal design it is attempted to utilize the simple and efficient Lagrangian interpolation schemes and to restrict spline interpolation to the movable boundaries.Abstract:
The design of a strictly modular and flexible system for structural optimization is discussed. OPTIMA 2.0 uses advanced design oriented concepts and is provided for linear and nonlinear structural behaviour. For shape optimal design it is attempted to utilize the simple and efficient Lagrangian interpolation schemes and to restrict spline interpolation to the movable boundaries. A simple interpolation scheme for sizing variables allows the simultaneous handling of sizing and shaping. Some approximation models for the explicit approximation of implicit constraint functions are discussed and evaluated. The realm of this models is extended by introducing an exponential hybrid scheme. Applications are presented in shape optimal design. Objectives are minimum weight as well as minimum stress. Some special aspects of the minimum stress problem are discussed.read more
Citations
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Journal ArticleDOI
An engineer's approach to optimal material distribution and shape finding
TL;DR: In this article, a foam-like material, with variable density, is used for the evaluation of material properties, and the approach is implemented in a pre-optimizer for optimal shape finding.
Journal ArticleDOI
Second order approximations in structural genesis and shape finding
TL;DR: In this article, the second-order sensitivities to behavior approximation in structural optimization are investigated and applied and the numerical computation of second derivatives is considered and evaluated, where shape finding by moving boundaries and shape genesis by distributing mass in a specified design domain are involved.
Book ChapterDOI
Some Explorations in the Genesis of Structures
TL;DR: In this article, the stiffness-density relation is derived from isotropic material with a density-dependent modulus of elasticity, which is used for shape design purposes of compliance minimal structures.
Book ChapterDOI
Some Approaches for Shape Finding in Optimal Structural Design
TL;DR: The movable shape problem is described by means of a blending function, which is governed by a comparatively small number of variables, which disposes the approach favourable to mathematical progamming (MP), which can handle all types of objectives and constraints very easily.
Journal ArticleDOI
Application and implementation of approximate explicit models in optimum structural design
U. Jehle,H. P. Mlejnek +1 more
TL;DR: An adaptive behaviour model for optimization of structures exposing nonlinear behaviour is presented and applied to an introductory example of the OPTIMA-S optimization package.
References
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Journal ArticleDOI
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R. L. Fox,M. P. Kapoor +1 more
TL;DR: Exact expressions for rates of change of eigenvalues and eigenvector to facilitate computerized design of complex structures are presented.
Journal ArticleDOI
Systematic control design by optimizing a vector performance index
G. Kreisselmeier,R. Steinhauser +1 more
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Journal ArticleDOI
Shape optimal design using B-splines
V. Braibant,Claude Fleury +1 more
TL;DR: In this article, the shape optimal design of an elastic structure is formulated using a design element technique, where Bezier and B-spline curves, typical of the CAD philosophy, are well suited to the definition of design elements.
Journal ArticleDOI
Preliminary Design of Composite Wings for Buckling, Strength, and Displacement Constraints
TL;DR: An unstiffened panel buckling constraint for balanced, symmetric laminated composites is included on the global design level in a mathematical programming structural optimization procedure for designing wing structures.
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