Optimization and Engineering

Items from 1 to 9 out of 9 results

article

Design space dimensionality reduction through physics-based geometry re-parameterization

András Sóbester, Stephen Powell

Optimization and Engineering > 2013 > 14 > 1 > 37-59

The effective control of the extent of the design space is the sine qua non of successful geometry-based optimization. Generous bounds run the risk of including physically and/or geometrically nonsensical regions, where much search time may be wasted, while excessively strict bounds will often exclude potentially promising regions. A related ogre is the pernicious increase in the number of design...

article

Editorial

Miguel F. Anjos

Optimization and Engineering > 2013 > 14 > 1 > 1-2

article

Topology optimization of tensegrity structures under compliance constraint: a mixed integer linear programming approach

Yoshihiro Kanno

Optimization and Engineering > 2013 > 14 > 1 > 61-96

A tensegrity structure is a prestressed pin-jointed structure consisting of discontinuous struts and continuous cables. For exploring new configurations of tensegrity structures, this paper addresses a topology optimization problem of tensegrity structures under the compliance constraint and the stress constraints. It is assumed that a cable loosens and loses the elongation stiffness when its tensile...

article

Variational techniques for assessing the technological signature of flat surfaces

Michele Dassisti, Francesco Maddalena, Alessio Brancolini, Michela Chimienti, more

Optimization and Engineering > 2013 > 14 > 1 > 155-174

The quality assessment of manufacturing operations performed to obtain given flat surfaces is always a problem of comparing the substitute model (approximating the features of the true manufactured part) to the nominal specifications, at any stage of the manufacturing cycle. A novel methodology, based on applications of classical tools of Calculus of Variations, is here presented with the aim of assessing...

article

A trust-region framework for constrained optimization using reduced order modeling

Anshul Agarwal, Lorenz T. Biegler

Optimization and Engineering > 2013 > 14 > 1 > 3-35

Reduced order models (ROM), such as proper orthogonal decomposition (POD), lead to powerful techniques to address computational challenges in PDE-constrained optimization. However, when incorporated within optimization strategies, ROMs are sufficiently accurate only in a restricted zone around the point in decision variable space where they are constructed. Consequently, the ROM needs to be updated...

article

CFD-based optimization of hovering rotors using radial basis functions for shape parameterization and mesh deformation

Christian B. Allen, Thomas C. S. Rendall

Optimization and Engineering > 2013 > 14 > 1 > 97-118

Aerodynamic shape optimization of a helicopter rotor in hover is presented, using compressible CFD as the aerodynamic model. An efficient domain element shape parameterization method is used as the surface control and deformation method, and is linked to a radial basis function global interpolation, to provide direct transfer of domain element movements into deformations of the design surface and...

article

Asymptotic bounds on the globally optimal positions of orthogonal stiffeners for rectangular plates in elastostatic bending

Nathan Perchikov

Optimization and Engineering > 2013 > 14 > 1 > 119-153

The present paper treats the problem of finding the asymptotic bounds for the globally optimal locations of orthogonal stiffeners minimizing the compliance of a rectangular plate in elastostatic bending. The essence of the paper is the utilization of a method of analysis of orthogonally stiffened rectangular plates first presented by Mazurkiewicz in 1962, and obtained herein in a closed form for several...

article

Shape design sensitivities improvement using convected unstructured meshes

Denis Kelliher, John S. Campbell

Optimization and Engineering > 2013 > 14 > 1 > 175-191

This paper focuses on various forms of direct differentiation methods for design sensitivity computation in the shape optimisation of continuum structures and the role of convected meshes on the accuracy of the sensitivities. A Pseudo-Analytical Sensitivity Analysis (P-ASA) method is presented and tested. In this method the response analysis component uses unstructured finite element meshes and the...

article

On the optimal design of river fishways

Lino Jose Alvarez-Vázquez, Joaquim Joao Júdice, Aurea Martínez, Carmen Rodríguez, more

Optimization and Engineering > 2013 > 14 > 1 > 193-211

A river fishway is a hydraulic structure enabling fish to overcome stream obstructions such as dams in hydroelectric power plants. The main aim of this paper is to present an application of mathematical modeling and optimal control theory to an ecological engineering problem related to preserve and enhance natural stocks of fish migrating between saltwater and freshwater. Particularly, we improve...

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Keywords

NUMERICAL OPTIMIZATION (2)
AERODYNAMICS (1)
ANALYTICAL GRADIENTS (1)
ASYMPTOTIC ANALYSIS (1)
CALCULUS OF VARIATION (1)
CFD (1)
CONVECTED UNSTRUCTURED FE MESHES (1)
DESIGN OPTIMIZATION (1)
ELASTIC PLATE BENDING (1)
FISHWAY (1)
FLAT SURFACES (1)
FORM-FINDING PROBLEM (1)
FREDHOLM’S 2ND KIND INTEGRAL EQUATION (1)
GEOMETRY MODELING (1)
GLOBALLY OPTIMAL POSITIONS (1)
KRIGING (1)
MIXED INTEGER OPTIMIZATION (1)
MULTIVARIATE FUNCTION APPROXIMATION (1)
NONLINEAR PROGRAMMING (1)
NONSMOOTH MECHANICS (1)
NUMERICAL SIMULATION (1)
OPTIMAL CONTROL (1)
ORTHOGONAL STIFFENERS (1)
PARAMETRIC GEOMETRY (1)
PARTIAL DIFFERENTIAL EQUATIONS (1)
PRESSURE SWING ADSORPTION (1)
PROPER ORTHOGONAL DECOMPOSITION (1)
QUALITY ASSESSMENT (1)
RADIAL BASIS FUNCTIONS (1)
REDUCED ORDER MODELING (1)
ROTORS (1)
SENSITIVITY ANALYSIS (1)
SHAPE DESCRIPTION (1)
SHAPE DESIGN (1)
SHAPE OPTIMIZATION (1)
SHAPE PARAMETERIZATION (1)
SURROGATE MODELING (1)
TECHNOLOGICAL SIGNATURE (1)
TENSEGRITY (1)
TENSION STRUCTURE (1)
TOPOLOGY OPTIMIZATION (1)
TRUST REGION (1)
VOLUME MESH DEFORMATION (1)
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