Solving three-dimensional layout optimization problems using fixed scale wavelets

2000 ◽  
Vol 25 (2-3) ◽  
pp. 274-285 ◽  
Author(s):  
G. C. A. DeRose Jr. ◽  
A. R. Díaz
Keyword(s):  
Optimization Problems ◽  
Three Dimensional ◽  
Layout Optimization

Design Optimization of Aircraft Engine-Mount Systems

1993 ◽  
Author(s):  
Hashem Ashrafiuon
Keyword(s):  
Design Optimization ◽  
Vibration Isolation ◽  
Optimization Problems ◽  
Three Dimensional ◽  
Low Frequency ◽  
Aircraft Engine ◽  
Variable Metric ◽  
Design Variables ◽  
Engine Mount ◽  
Optimization Search

Abstract Design optimization of aircraft engine-mount systems for vibration isolation is presented. The engine is modeled as a rigid body connected to a flexible base representing the nacelle. The base is modeled with mass and stiffness matrices and structural damping using finite element modeling. The mounts are modeled as three-dimensional springs with hysteresis damping. The objective is to select the stiffness coefficients and orientation angles of the individual mounts to minimize the transmitted forces from the engine to the base. Meanwhile, the mounts have to be stiff enough not allowing engine deflection to exceed its limits under static and low frequency loadings. It is shown that with an optimal system the transmitted forces may be reduced significantly particularly when mount orientation angles are also treated as design variables. The optimization problems are solved using a Constraint Variable Metric approach. The closed form derivatives of the engine vibrational amplitudes with respect to design variables are derived in order to achieve a more effective optimization search technique.

Inverse Analysis of Forming Processes Based on FORGE Environment

2014 ◽  
Vol 611-612 ◽  
pp. 1494-1502 ◽  
Author(s):  
Stephane Marie ◽  
Richard Ducloux ◽  
Patrice Lasne ◽  
Julien Barlier ◽  
Lionel Fourment
Keyword(s):  
Inverse Analysis ◽  
Optimization Problems ◽  
Three Dimensional ◽  
Optimization Method ◽  
Transfer Coefficients ◽  
Support Design ◽  
Finite Element Software ◽  
Automatic Optimization ◽  
Dimensional Simulation ◽  
Constitutive Parameters

In the field of materials forming processes, the use of simulation coupled with optimization is a powerful numerical tool to support design in industry and research. The finite element software Forge®, a reference in the field of the two-dimensional and three-dimensional simulation of forging processes, has been coupled to an automatic optimization engine. The optimization method is based on meta-model assisted evolutionary algorithm. It allows solving complex optimization problems quickly. This paper is dedicated to a specific application of optimization, inverse analysis. In a first stage, a range of reverse analysis applications are considered such as material rheological and tribological characterization, identification of heat transfer coefficients and, finally, the estimation of Time Temperature Transformation curves based on existing Continuous Cooling Transformation diagrams for steel quenching simulation. In a second part, a novel inverse analysis application is presented in the field of cold sheet forming, the identification of the material anisotropic constitutive parameters that allow matching with the final shape of the component after stamping. The advanced numerical methods used in this kind of complex simulations are described along with the obtained optimization results. This article shows that automatic optimization coupled with Forge® can solve many inverse analysis problems and is a valuable tool for supporting development and design of metals forming processes.

scholarly journals A Literature Review on Circle and Sphere Packing Problems: Models and Methodologies

2009 ◽  
Vol 2009 ◽  
pp. 1-22 ◽  
Author(s):  
Mhand Hifi ◽  
Rym M'Hallah
Keyword(s):  
Literature Review ◽  
Branch And Bound ◽  
Euclidean Plane ◽  
Optimization Problems ◽  
Relevant Literature ◽  
Three Dimensional ◽  
Sphere Packing ◽  
Nonconvex Minimization ◽  
Packing Problems ◽  
Computer Aided

This paper reviews the most relevant literature on efficient models and methods for packing circular objects/items into Euclidean plane regions where the objects/items and regions are either two- or three-dimensional. These packing problems are NP hard optimization problems with a wide variety of applications. They have been tackled using various approaches-based algorithms ranging from computer-aided optimality proofs, to branch-and-bound procedures, to constructive approaches, to multi-start nonconvex minimization, to billiard simulation, to multiphase heuristics, and metaheuristics.

Models and algorithms for fair layout optimization problems

2008 ◽  
Vol 179 (1) ◽  
pp. 5-14 ◽  
Author(s):  
Albert E. Fernandes Muritiba ◽  
Manuel Iori ◽  
Silvano Martello ◽  
Marcos J. Negreiros Gomes
Keyword(s):  
Optimization Problems ◽  
Layout Optimization

Keys and Tactics of Existing Barracks Spatial Layout Optimization

2014 ◽  
Vol 1065-1069 ◽  
pp. 1622-1625
Author(s):  
Lei Yan ◽  
Wei Ran Zhou
Keyword(s):  
Control Method ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Spatial Layout ◽  
Layout Optimization ◽  
The Sustainable Development ◽  
Space Construction ◽  
Function Integration ◽  
Land Reuse ◽  
Three Dimensional Space

Spatial layout optimization is a core of existing barracks renewal. Distinguishing from new built barracks, existing barrack spatial layout optimization needs to pay more attention to solve the contradiction between current and future. So in this chapter, we develop six primary design keys applied to existing barracks including harmony relations between barrack and its surrounding environment, emphasis on weakness construction, optimize allocation, improve security defense capabilities, enhance artistry of spatial layout and realize the whole structure optimization. Reference to ancient classical fortification thoughts and current construction conditions, we also explore 5 tactics to optimize existing barracks spatial layout , namely, function integration method, node co-ordinate method, axis control method, three-dimensional space construction method, as well as idle land reuse method. Finally, we choose one tipical case to integrated apply the above keys and tactics from theoretical and practical fields promoting the sustainable development of existing barrack .

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