The Topology Optimization Design for the Stereolithography Based Investment Casting Pattern

2011 ◽  
Vol 697-698 ◽  
pp. 604-607
Author(s):  
X.J. Gu ◽  
Ji Hong Zhu ◽  
W.H. Zhang ◽  
J.S. Li
Keyword(s):  
Topology Optimization ◽  
Investment Casting ◽  
Structural Design ◽  
Optimization Design ◽  
Crack Problem ◽  
Optimization Method ◽  
Design Domain ◽  
Ceramic Shell ◽  
Rapid Casting ◽  
The Cost

The purpose of this paper is to introduce the topology optimization method into the lattice style design for the rapid casting SL patterns. During the burnout procedure of the SL resin pattern, the thermal expansion will lead to the crack of the ceramic shell and fail the investment casting. Therefore, the SL patterns are always designed hollowed and some lattice styles are used to fill the cavity to solve the problem. In this paper, we propose to carry out the structural design by assigning the inner part of the SL pattern as the design domain where the material distribution is optimized with topology optimization. The idea is 1) to save the cost of the resin material, 2) to solve the crack problem of the ceramic shell and 3) to maintain certain stiffness for the pattern itself. As a result, we choose to minimize the thermal stress in the ceramic shell as the design objective with the stiffness and material cost of the SL pattern constrained to certain values. The topology optimization is implemented with different definitions of design domain in this paper. Various optimal results are obtained numerically. By comparing the optimal design with the existing lattice style, the newly obtained designs have shown better performances in reducing the stress in ceramic shell and maintaining the stiffness of the SL pattern.

On the Topology Optimization Design for the Stereolithography Based Investment Casting Model

2010 ◽  
Vol 139-141 ◽  
pp. 1464-1467 ◽  
Author(s):  
Ji Hong Zhu ◽  
Wei Hong Zhang ◽  
Xiao Jun Gu
Keyword(s):  
Topology Optimization ◽  
Investment Casting ◽  
Optimization Design ◽  
Coefficient Of Thermal Expansion ◽  
Crack Problem ◽  
Optimization Method ◽  
Ceramic Shell ◽  
Topology Optimization Problem ◽  
Design Variables ◽  
Material Layout

The purpose of this paper is to avoid the crack problem of the ceramic shell during the burnout procedure of the rapid investment casting using stereolithograghy (SLA) model. Since the coefficient of thermal expansion of the SLA model is much higher than the coefficient of the ceramic shell, the internal structural patterns have to be properly designed to reduce the stress level in the ceramic shell. A topology optimization method is proposed here to find better microstructure designs to satisfy both the strength of the ceramic shell and the stiffness of the SLA model itself. Taking the arrayed microstructure into account, the pseudo-densities of the SLA model elements to describe the material layout are defined and assumed as the design variables. By deriving the design sensitivities, the topology optimization problem is solved with reasonable numerical results generated.

Optimization Design of Vehicle Frame Based on ANSYS

2012 ◽  
Vol 590 ◽  
pp. 341-345 ◽  
Author(s):  
Yong Hai Wu
Keyword(s):  
Topology Optimization ◽  
Structural Design ◽  
Optimization Design ◽  
Structural Model ◽  
Optimization Method ◽  
Variable Density ◽  
Safety Performance ◽  
Frame Structure ◽  
Ansys Software ◽  
Special Vehicle

A special vehicle frame as the research object, its topology optimization mathematical model and its algorithm is established based on variable density method. Topology optimization method of continuum structures is applied to the frame structural design of this special vehicle using Optistruct solver. Take the least flexibility of frame as design goal; topology optimization design of frame structure was carried under the condition of flexure, torsion and flexure-torsion. New structural model of frame was determined according to results of topology optimization and engineering experience. The calculation of the stress, deformation and the volume for optimization results was conducted with ANSYS software, and compared with the data before optimization. The results showed that the safety performance of optimized frame improved, and the weight reduced.

Topology Synthesis of Two-Phase Compliant Actuators

1999 ◽  
Author(s):  
Ole Sigmund
Keyword(s):  
Topology Optimization ◽  
Material Design ◽  
Optimization Method ◽  
The Other ◽  
Design Domain ◽  
Active Materials ◽  
Two Phase ◽  
Thermal Actuators ◽  
Compliant Actuators ◽  
Topology Optimization Method

Abstract This paper describes how the topology optimization method can be used as a tool for the synthesis of two-phase compliant actuators. Two materials, one or both being active materials, are distributed in a design domain such that the work performed on an elastic workpiece is maximized. The two-material design is obtained by introducing two variables per element. One variable determines the relative density of material in the element and the other variable determines the material type. Examples demonstrate the design of thermal actuators and gripping mechanisms.

scholarly journals Lightweight Design of Front Suspension Upright of Electric Formula Car Based on Topology Optimization Method

2020 ◽  
Vol 11 (1) ◽  
pp. 15 ◽  
Author(s):  
Jixiong Li ◽  
Jianliang Tan ◽  
Jianbin Dong
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Lightweight Design ◽  
Geometric Model ◽  
Load Condition ◽  
Optimization Method ◽  
Structure Design ◽  
Front Suspension ◽  
Emergency Braking ◽  
Topology Optimization Method

In order to obtain a lightweight front upright of an electric formula car’s suspension, the topology optimization method is used in the front upright structure design. The mathematical model of the lightweight optimization design is constructed, and the geometric model of the initial design of the front upright is subjected to the ultimate load condition. The structural optimization of a front upright resulted in the mass reduction of the upright by 60.43%. The optimized model was simulated and verified regarding the strength, stiffness, and safety factor under three different conditions, namely turning braking, emergency braking, and sharp turning. In the experiment, the uprights were machined and assembled and integrated into the racing suspension. The experimental results showed that the optimized front uprights met the requirements of performance.

Optimization design of uncertainty fluid topology in the parallel connection of double pump

2014 ◽  
Vol 11 (3) ◽  
pp. 311-316
Author(s):  
J. Liu ◽  
Z. Wei
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Optimization Method ◽  
Social Benefits ◽  
Filling Material ◽  
Engineering Model ◽  
Parallel Connection ◽  
Load Pressure ◽  
Filling Station ◽  
Topology Optimization Method

This paper analyzes the characteristics of paste filling material and the parallel output of double pump. By combining the equipment layout of the paste filling station, using the uncertainty fluid topology optimization method based on SIMP to optimize parallel connection structure, we designed the engineering model optimized connection. The optimized connection improves the capacity of the paste filling pump, reduces the filling energy consumption and the load pressure of the pump, and can achieve good economic and social benefits.

Research of Optimization Design of Structural Concept about Portal Frame

2011 ◽  
Vol 130-134 ◽  
pp. 719-724
Author(s):  
Dong Nan Li ◽  
Jing Yu Wu ◽  
Cun En Chen
Keyword(s):  
Structural Design ◽  
Optimization Design ◽  
Value Engineering ◽  
Cost Performance ◽  
Optimum Structural Design ◽  
Portal Frame ◽  
Structural Concept ◽  
The One ◽  
The Cost

There're two issues should be concerned about during the optimization design of structural concept. The one is The using performance of structure, the another is the cost of foundation should be contained in the cost of whole structure. And it is suggested that The cost performance in value engineering should be used during the optimization design of structural concept. In this paper, the method and the process of the optimum structural design is expounded by optimizing a structural concept of project.

scholarly journals Advanced Optimization Design of Cross Beams Structure

2014 ◽  
Vol 8 (1) ◽  
pp. 117-123
Author(s):  
Ke Zhang ◽  
Xuan Mu ◽  
Dehong Zhao ◽  
Yuhou Wu
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Simulation Analysis ◽  
Lightweight Design ◽  
Optimization Method ◽  
Production Costs ◽  
Structure Quality ◽  
Machining Center ◽  
Traditional Structure ◽  
Inherent Frequency

Solid Isotropic Microstructure with Penalization(SIMP) in topology optimization was deeply analyzed, and thus SIMP topology optimization criteria algorithm was deduced. Simulation analysis to the results was also conducted by Ansys, so as the structural lightweight design to machine crossbeams of the HTM series gantry. By verifying, the structure was 3.8% lower than the traditional structure quality, stiffness increased by 16.07%, and the overall inherent frequency was improved. By applying topology optimization method to the design process of the machining center HTM series, ma-terial utilization is improved and production costs were reduced.

Topology optimization design for buckling analysis related to the size effect

2021 ◽  
pp. 108128652110666
Author(s):  
Ning Gan ◽  
Qianxuan Wang
Keyword(s):  
Topology Optimization ◽  
Size Effect ◽  
Structural Design ◽  
Optimization Design ◽  
Couple Stress Theory ◽  
Classical Mechanics ◽  
Modified Couple Stress Theory ◽  
Small Scale ◽  
Scale Structures ◽  
Small Scale Structures

Owing to the excellent performance of microstructures or nanomaterials with well-designed topological configuration, the characteristic scale of structural design is gradually shifting from macroscopic to nanoscale or microscale structural design. However, the size effect that emerges from the small-scale structures may not be explained effectively with the hypothesis of classical mechanics owing to the lack of microscopic parameters in the classical constitutive model. In addition, slender beams within such small-scale structures are prone to buckling failure, which puts forward additional requirements for the stability design of the structure except for the overall compliance of the structure. Therefore, a topology optimization framework combining the modified couple stress theory with the solid isotropic material penalization (SIMP) model is constructed to illustrate the size effect on topology optimization. Numerical results show that the size effect affects the compliance, buckling performance, and topological configurations of the evolutionary structures.

Offshore Platform Topsides Structural Design: Using Topology Optimization to Generate Novel Design Concept

2021 ◽  
Author(s):  
Zhongwei Li ◽  
Aimin Wang ◽  
Jonathan Wang ◽  
Otto Dasilva
Keyword(s):  
Topology Optimization ◽  
Structural Design ◽  
Strength Criterion ◽  
Optimization Method ◽  
Offshore Platform ◽  
Structural Element ◽  
Structural Shape ◽  
Ocean Environment ◽  
Geometric Arrangements ◽  
Novel Design

Abstract The paper presents topology optimization performed for the concept study of a semi-submersible platform topsides structure. The topsides truss system consisting of I beams carries the equipment payload and the environment loads. The structural weight needs to be reduced in order to maximize the allowable equipment weight, and the structural strength criterion must be satisfied for the harsh ocean environment. Topology optimization is a powerful tool to generate designs that optimally distribute the structural material for the balance between structural weight and strength. A finite-element-based topology optimization method assigns a density value to each structural element and updates this density value using topology optimization algorithms during each design iteration. Elements in the load-transferring path retain high density value at the end cycle and form an efficient structural shape under the given design load conditions and constraints. The topology optimization generated novel and optimal geometric arrangements for the topsides structure. Two corresponding innovative topsides truss concepts were developed. The new topsides designs were compared with an existing benchmark design for the structural weight and strength to demonstrates the advantages of topology optimization over conventional empirical approach for offshore platform topsides structural design. At the same strength level, the novel designs reduced the structural weight significantly. One novel design was selected for practical semi-submersible designs at Exmar Offshore Company.

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