A hybrid topology optimization algorithm for static and vibrating shell structures

2002 ◽  
Vol 54 (6) ◽  
pp. 835-852 ◽  
Author(s):  
F. Belblidia ◽  
S. Bulman
Keyword(s):  
Topology Optimization ◽  
Optimization Algorithm ◽  
Shell Structures ◽  
Hybrid Topology

A hybrid topology optimization algorithm for structural design

2005 ◽  
Vol 37 (8) ◽  
pp. 849-866 ◽  
Author(s):  
Kong-Tian Zuo ◽  
Li-Ping Chen ◽  
Yun-Qing Zhang ◽  
Jingzhou Yang
Keyword(s):  
Topology Optimization ◽  
Optimization Algorithm ◽  
Structural Design ◽  
Hybrid Topology

scholarly journals Shell-supported footbridges

2020 ◽  
Vol 7 (1) ◽  
pp. 199-214
Author(s):  
Luigi Fenu ◽  
Eleonora Congiu ◽  
Giuseppe Carlo Marano ◽  
Bruno Briseghella
Keyword(s):  
Topology Optimization ◽  
High Efficiency ◽  
Shell Structures ◽  
Form Finding ◽  
Fundamental Research ◽  
Spring System ◽  
Earthquake Action ◽  
Concrete Shell ◽  
Concrete Shells ◽  
Thrust Network Analysis

AbstractArchitects and engineers have been always attracted by concrete shell structures due to their high efficiency and plastic shapes. In this paper the possibility to use concrete shells to support footbridges is explored. Starting from Musmeci’s fundamental research and work in shell bridge design, the use of numerical form-finding methods is analysed. The form-finding of a shell-supported footbridge shaped following Musmeci’s work is first introduced. Coupling Musmeci’s and Nervi’s experiences, an easy construction method using a stay-in-place ferrocement formwork is proposed. Moreover, the advantage of inserting holes in the shell through topology optimization to remove less exploited concrete has been considered. Curved shell-supported footbridges have been also studied, and the possibility of supporting the deck with the shell top edge, that is along a single curve only, has been investigated. The form-finding of curved shell-supported footbridges has been performed using a Particle-Spring System and Thrust Network Analysis. Finally, the form-finding of curved shell-supported footbridges subjected to both vertical and horizontal forces (i.e. earthquake action) has been implemented.

A topology optimization algorithm based on topological derivative and level-set function for designing phononic crystals

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rolando Yera ◽  
Luisina Forzani ◽  
Carlos Gustavo Méndez ◽  
Alfredo E. Huespe
Keyword(s):  
Topology Optimization ◽  
Level Set ◽  
Optimization Algorithm ◽  
Phononic Crystal ◽  
Phononic Crystals ◽  
Lagrangian Function ◽  
Topological Derivative ◽  
Content Type ◽  
Level Set Function ◽  
Set Function

PurposeThis work presents a topology optimization methodology for designing microarchitectures of phononic crystals. The objective is to get microstructures having, as a consequence of wave propagation phenomena in these media, bandgaps between two specified bands. An additional target is to enlarge the range of frequencies of these bandgaps.Design/methodology/approachThe resulting optimization problem is solved employing an augmented Lagrangian technique based on the proximal point methods. The main primal variable of the Lagrangian function is the characteristic function determining the spatial geometrical arrangement of different phases within the unit cell of the phononic crystal. This characteristic function is defined in terms of a level-set function. Descent directions of the Lagrangian function are evaluated by using the topological derivatives of the eigenvalues obtained through the dispersion relation of the phononic crystal.FindingsThe description of the optimization algorithm is emphasized, and its intrinsic properties to attain adequate phononic crystal topologies are discussed. Particular attention is addressed to validate the analytical expressions of the topological derivative. Application examples for several cases are presented, and the numerical performance of the optimization algorithm for attaining the corresponding solutions is discussed.Originality/valueThe original contribution results in the description and numerical assessment of a topology optimization algorithm using the joint concepts of the level-set function and topological derivative to design phononic crystals.

Miniaturization of patch antenna based on hybrid topology optimization

2020 ◽  
Vol 30 (9) ◽  
Author(s):  
Shun‐Hui Zhu ◽  
Xue‐Song Yang ◽  
Jian Wang ◽  
Bing‐Zhong Wang
Keyword(s):  
Topology Optimization ◽  
Patch Antenna ◽  
Hybrid Topology

scholarly journals Multi-axis 3D printing of material reduced shell structures on a reconfigurable supporting system using topology optimization principles

2020 ◽  
Vol 44 ◽  
pp. 379-386
Author(s):  
Odysseas Kontovourkis ◽  
Marios C. Phocas ◽  
George Tryfonos ◽  
Christos Georgiou
Keyword(s):  
Topology Optimization ◽  
3D Printing ◽  
Shell Structures ◽  
Supporting System
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