Concurrent Design of Structures and Materials Based on the Bi-Directional Evolutionary Structural Optimization

2013 ◽  
Vol 438-439 ◽  
pp. 445-450 ◽  
Author(s):  
Xiao Lei Yan ◽  
Xiao Dong Huang ◽  
Yi Min Xie
Keyword(s):  
Structural Optimization ◽  
Optimization Algorithm ◽  
Effective Properties ◽  
Homogenization Method ◽  
Two Phase ◽  
Element Analysis ◽  
Evolutionary Structural Optimization ◽  
The Finite Element Analysis ◽  
Beso Method ◽  
Mean Compliance

Different from the independent optimization of macrostructures or materials, a two-scale topology optimization algorithm is developed in this paper based on the bi-directional evolutionary structural optimization (BESO) method for concurrently designing a macrostructure and its composite microstructure. The objective is to minimize the mean compliance of the structure which is composed of a two-phase composite. The effective properties of the composite are calculated through the homogenization method and integrated into the finite element analysis of the structure. Sensitivity analysis for the structure and microstructure is conducted by the adjoint method. Based on the derived sensitivity numbers, the BESO approach is applied for iteratively updating the topologies for both the structure at the macro level and the microstructure of composite at the micro level. Numerical examples are presented to validate the effectiveness of the proposed optimization algorithm.

The Finite Element Analysis of Omni-Direction Side-Loading Forklift Truck Lifting System Based on COSMOSWorks

2012 ◽  
Vol 184-185 ◽  
pp. 534-537
Author(s):  
Jing Jing Zhou ◽  
Ai Dong Guo ◽  
Chun Hui Li ◽  
Zhen Jiang Lin ◽  
Tie Zhuang Wu
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Optimization ◽  
Experimental Measurements ◽  
Element Analysis ◽  
Forklift Truck ◽  
The Finite Element Analysis ◽  
Lifting System

By setting contact sets, achieved overall analysis results of the mechanical properties with omni-direction side-loading forklift truck lifting system based on COSMOSWorks. And made an experimental measurements to omni-direction side-loading forklift truck lifting system by electrometric methods. There was a good relevance between experimental data and calculation values, and the deviation was basically within the 10 percent allowed. Finally, in this way it verified the correctness and reliability of the finite element analysis by experimental measurements. Ensured the omni-direction side-loading forklift truck lifting system could be safe and efficient to work. And also it laid a foundation for subsequent structural optimization.

scholarly journals The Finite Element Analysis for a Mini-Conductance Probe in Horizontal Oil-Water Two-Phase Flow

Sensors ◽  
2016 ◽  
Vol 16 (9) ◽  
pp. 1352 ◽  
Author(s):  
Weihang Kong ◽  
Lingfu Kong ◽  
Lei Li ◽  
Xingbin Liu ◽  
Ronghua Xie ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Conductance Probe ◽  
Oil Water

scholarly journals Finite Element Analysis of Bend Test of Sandwich Structures Using Strain Energy Based Homogenization Method

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Hassan Ijaz ◽  
Waqas Saleem ◽  
Muhammad Zain-ul-Abdein ◽  
Tarek Mabrouki ◽  
Saeed Rubaiee ◽  
...  
Keyword(s):  
Finite Element ◽  
Strain Energy ◽  
Effective Properties ◽  
Sandwich Structures ◽  
Sandwich Beam ◽  
Energy Criterion ◽  
Homogenization Method ◽  
Fe Analysis ◽  
Bend Test ◽  
Element Analysis

The purpose of this article is to present a simplified methodology for analysis of sandwich structures using the homogenization method. This methodology is based upon the strain energy criterion. Normally, sandwich structures are composed of hexagonal core and face sheets and a complete and complex hexagonal core is modeled for finite element (FE) structural analysis. In the present work, the hexagonal core is replaced by a simple equivalent volume for FE analysis. The properties of an equivalent volume were calculated by taking a single representative cell for the entire core structure and the analysis was performed to determine the effective elastic orthotropic modulus of the equivalent volume. Since each elemental cell of the hexagonal core repeats itself within the in-plane direction, periodic boundary conditions were applied to the single cell to obtain the more realistic values of effective modulus. A sandwich beam was then modeled using determined effective properties. 3D FE analysis of Three- and Four-Point Bend Tests (3PBT and 4PBT) for sandwich structures having an equivalent polypropylene honeycomb core and Glass Fiber Reinforced Plastic (GFRP) composite face sheets are performed in the present study. The authenticity of the proposed methodology has been verified by comparing the simulation results with the experimental bend test results on hexagonal core sandwich beams.

The Finite Analysis and Optimization of Head Runner of Rubber Sheeting Extruder

2013 ◽  
Vol 561 ◽  
pp. 25-29 ◽  
Author(s):  
Ying Yu ◽  
Jia Wang ◽  
Yu Guang Gong ◽  
Bai Yuan Lv
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Velocity Field ◽  
Structural Optimization ◽  
Optimization Design ◽  
Pressure Field ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Shape Analyses

In this paper, Φ120 rubber sheeting extruder is used as an example, It analyses reversely die shape through a given product shape, analyses the distributions of the velocity field and pressure field by POLYFLOW, and carries out the finite element analysis and structural optimization design of head runner.

Topology Optimization of Photonic Band Gap Crystals

2014 ◽  
Vol 553 ◽  
pp. 824-829 ◽  
Author(s):  
Xiao Dong Huang ◽  
Shi Wei Zhou ◽  
Yi Min Xie ◽  
Qing Li
Keyword(s):  
Topology Optimization ◽  
Photonic Crystals ◽  
Band Gap ◽  
Photonic Band Gap ◽  
Dielectric Materials ◽  
Transverse Magnetic ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Beso Method ◽  
Photonic Band

This paper proposes a new topology optimization algorithm based on the bi-directional evolutionary structural optimization (BESO) method for the design of photonic band gap crystals. The photonic crystals are assumed to be periodically composed of two given dielectric materials. Based on the finite element analysis, the proposed BESO algorithm gradually re-distributes dielectric materials within the unit cell until the resulting photonic crystals possess a maximal band gap at the desirable frequency level. Numerical examples for both transverse magnetic (TM) and transverse electric (TE) polarizations are presented, and the optimized photonic crystals exhibit novel patterns markedly different from traditional designs of photonic crystals.

scholarly journals On The Optimal Forms Finding of Shallow Foundations Made Up of Four Foothills with Explicit Considerations of Structural Perturbations

2019 ◽  
Vol 4 (3) ◽  
pp. 601-618
Author(s):  
Koumbe Mbock ◽  
Etoua Remy Magloire ◽  
Ayissi Raoul Domingo ◽  
Mamba Mpele ◽  
Okpwe Mbarga Richard
Keyword(s):  
Finite Element ◽  
Structural Optimization ◽  
Optimization Technique ◽  
Optimal Solution ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Elastic Model ◽  
Element Analysis ◽  
Evolutionary Structural Optimization ◽  
Structural Perturbations

In the absence of the exact footing form of shallow foundations, we develop a procedure to determine the optimal footing form made up of four foothills from the knowledge of the inexact footing forms. The structural perturbations that are the major cause of the inexact forms are approximated in linear elastic model whose the solution is used to formulate the evolutionary structural optimization problem. To stabilize the solution, a serial of decisions is made to minimize structural perturbations in finite element modeling, initial volume and design constraints. By using the evolutionary structural optimization technique, we examine if the material of efficient and inefficient perturbations is needed or not on the points of inexact forms. Our analysis shows that the loading forces can be transferred to structural perturbations when they are efficient and used to reinforce the design material. This transfer can modify geometric elements of footing in finite element analysis and the optimal solution. The results of the numerical experiment provide the optimal footing form of shallow foundation, the sizes of associated foothills and the form of inefficient perturbations. This approach allows to redesign the structures from the inexact forms and detects the errors of dimensioning.

Bi-Directional Evolutionary Structural Optimization Method with Draw Direction Constraints

2013 ◽  
Vol 420 ◽  
pp. 346-351
Author(s):  
Tien Tung Chung ◽  
Jia Pei Wang ◽  
Yan Zuo Chen ◽  
Ta Chuan Liu
Keyword(s):  
Structural Optimization ◽  
Mechanical Design ◽  
Optimization Method ◽  
Optimized Design ◽  
Design Problems ◽  
Closed Cavity ◽  
Evolutionary Structural Optimization ◽  
Draw Direction ◽  
Beso Method ◽  
Element Removal

This paper proposes a new bi-directional evolutionary structural optimization (BESO) method with draw direction constraints. Draw direction constraints, defined by required manufacturing process, are achieved by modifying element removal/addition criteria such that elements are removed from the top surface of the draw direction to the inner design domain. The optimized design with draw direction constraints is free from hollow or closed cavity geometries which are infeasible for manufacturing. A stiffness design of a motor front cover is carried out to show the ability of the proposed method in practical mechanical design problems.

scholarly journals Structural Optimization of Ship Lock Heads during Construction Period considering Concrete Creep

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Chao Su ◽  
Jiawei Bai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Optimization ◽  
Early Stage ◽  
Big Bang ◽  
Element Analysis ◽  
Creep Stress ◽  
The Finite Element Analysis ◽  
Big Crunch ◽  
Ship Lock

Traditional structural optimization is mainly based on the assumption that the materials are elastic, which cannot represent real stress fields in structures. In this study, the genetic algorithm, big bang-big crunch algorithm, and hybrid big bang-big crunch algorithm were employed to optimize the design factors of ship lock heads during concrete construction. The optimization goal was to determine the minimum volume of concrete. The factors considered included the hydration heat, the early-stage creep, and the transient deformation under external loads. In the finite element analysis, three types of boundary conditions were considered. The whole construction process was simulated, and the maximum tensile and compressive stresses, the stability, and the overturning of the lock head were examined. Based on the finite element analysis, to reduce the consumption of memory, a set of implicit recursive equations were used to calculate the thermal creep stress. Thirty-four design variables were distinguished for optimization. A case study on the optimization of a ship lock head was used to demonstrate the optimization process. The optimization results showed that the hybrid big bang-big crunch algorithm was more effective, and some conclusions were derived.

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