Method of Continuum Structural Topology Optimization with Information Functional Materials Based on K Nearest Neighbor

2011 ◽  
Vol 321 ◽  
pp. 200-203
Author(s):  
Jing Kui Li ◽  
Yi Min Zhang
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Nearest Neighbor ◽  
Functional Materials ◽  
Structural Topology ◽  
K Nearest Neighbor ◽  
Original Design ◽  
Structure Topology ◽  
Unit Stress ◽  
Information Functional

The KNN method is extracted from the technique of pattern recognition for the continuum structure topology optimization design with information functional materials. Original design region is taken as initial sample space, and continuum structure's units are regarded as samples. Unit stress and displacement sensitivity are utilized as feature vector to describe sample, and the feature vectors' Euclidean distance is considered as the recognition standard to classify all the samples. One FEM package is utilized to process the entire optimization. Finally, the topology optimization result is obtained. Several examples are verified under different situations. The results indicate that the KNN method is feasible.

Topology Optimization Design of Pre-Stressed Plane Entity Steel Structure with the Constrains of Stress and Displacement

2014 ◽  
Vol 945-949 ◽  
pp. 1216-1222 ◽  
Author(s):  
Li Yao ◽  
Yun Xia Gao ◽  
Hai Jun Yang
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Mechanical Performance ◽  
Steel Structure ◽  
Structural Topology ◽  
Unit Size ◽  
Structure Topology ◽  
Design Variables ◽  
Displacement Sensitivity ◽  
Low Sensitivity

For the prestressed plane entitiy steel structure topology optimization design which design variables include the cable pretension value, unit size and the structural topology, the optimized mathematical model which objective function is the minimum structural weight is established with consideration of the constrains of stress and displacement. As for the solving method, firstly we need to determine the pretension applying to the cable according to full stress design and choose the unit size; then we need to conduct displacement sensitivity analysis to delete the low sensitivity unit to realize the structural topology optimization design. The example result is in conformity with the corresponding system of mechanical performance, and it indicates that the method proposed in this paper is effective.

Structure Topology Optimization Design for Compression Box of Horizontal Preloading Domestic Waste Transfer Station

2013 ◽  
Vol 475-476 ◽  
pp. 1382-1386
Author(s):  
Hui Zhou ◽  
Gang Yan Li ◽  
Yuan Zhang ◽  
Le Li
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Bottom Plate ◽  
Structural Topology Optimization ◽  
Structural Topology ◽  
Domestic Waste ◽  
Side Plate ◽  
Structure Topology ◽  
Transfer Station ◽  
Waste Transfer

Horizontal preloading domestic waste transfer station is the core equipment for domestic waste disposal. Compression equipment is the elementary equipment of horizontal preloading domestic waste transfer station, which should be ensured its mechanical properties and structural lightweight. According to the compression box structure in this paper, structural topology optimization model is established. By using HyperWorks software, the result of structural topology optimization result of compression box is obtained. Based on the result of topology optimization, the structural improvement design model of compression box is established, and the number, location, size of strengthening rib for bottom plate, top plate, side plate are optimal designed so as to realize structural lightweight.

Structure Topology Optimization Design and Shock Resistance Study on Nuclear Power Safety DCS Cast Aluminum Cabinet

2020 ◽  
Author(s):  
Wang Dongwei ◽  
Liu Mingxing ◽  
Wu Xiao ◽  
Yan Hao ◽  
Wu Zhiqiang
Keyword(s):  
Topology Optimization ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Optimization Design ◽  
High Stress ◽  
Shock Load ◽  
Normal Operation ◽  
Cast Aluminum ◽  
Structure Topology

Abstract Offshore floating nuclear power plant (FNPP) is characterized by its small and mobility, which is not only able to provide safe and efficient electric energy to remote islands, but to the oil and gas platforms. The safety digital control system (DCS) cabinet, as a carrier for the electronic devices, plays a significant role in ensuring the normal operation of the nuclear power plant. To satisfy the requirements of cabinet used in the sea environment, such as well rigidity, shock load resistance, good seal and corrosion resistance, etc, more and more attention is focused on the cast aluminum cabinet. However, the cast aluminum structure may cause larger weight of cabinet, which inevitability affects the mobility of cabinet, and increases the carried load of ship as well. Therefore, seeking for an effective approach to design a light weight cast aluminum cabinet for the offshore FNPP is definitely necessary. In this work, a frame of cast aluminum cabinet with lightweight is obtained successfully via structure topology optimization design, it is found that the weight of the frame can be reduced to 50% after optimization iterations. Subsequently, the natural frequency of the optimized cast aluminum cabinet is calculated by using ABAQUS, it is seen that the first mode frequency of the frame is beyond 30 Hz, which can meet the basic stiffness requirement. Accordingly, dynamic design analysis method (DDAM) is performed to verify the ability of the optimized cast aluminum cabinet in resisting sudden shock load, and the shock response characteristics of the cabinet are determined. Numerical results support that the optimized frame of cabinet possesses good resistance to high level shock. However, for the assembled cast aluminum cabinet, the vertical shock circumstance turns out to be the most critical condition, high stress and deformation regions occurs at the bracket and column. Reinforcements are proposed to make the bracket stiffer in this shock loading condition.

The Optimization Design of Arm Bracket Structure Topology Based on ANSYS

2013 ◽  
Vol 834-836 ◽  
pp. 1464-1469
Author(s):  
Sheng Mei Luo ◽  
Zhao Yang Niu ◽  
Wei Liu ◽  
Fu Fang Luo ◽  
Jun Jun Jiang
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Optimal Topology ◽  
Dimensional Model ◽  
Structure Topology ◽  
Change Mechanism ◽  
Machining Center ◽  
Automatic Tool Change ◽  
Automatic Tool ◽  
Ansys Workbench

The detail analysis proposal of the cylinder body is put forward for the automatic tool change mechanism of the QYJ-21 type horizontal machining center. It consists of three main aspects. Firstly, the dimensional model of the cylinders arm bracket portion will be created. Secondly, the topology optimization design of the arm bracket is implemented based on ANSYS Workbench. Finally, meeting the stiffness requirements, the optimal topology shape will be established, for it had the lightest weight.

Vertical Tail Topology Optimization Design Based on the Variable Density Method with Constraint Factor

2013 ◽  
Vol 300-301 ◽  
pp. 280-284 ◽  
Author(s):  
Fu Sheng Qiu ◽  
Wu Qiang Ji ◽  
Hou Chao Xu
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Optimization Method ◽  
Optimality Criteria ◽  
Variable Density ◽  
Structural Constraints ◽  
Structural Topology ◽  
Interpolation Model ◽  
Constraint Factor ◽  
Density Method

The topology optimization design problem with multiple constraints for the complex vertical tail structure is studied in this paper. The variable density structural topology optimization method is improved by introducing a constraint factor. According to the different structural constraints and design requirements, variable factors and element pseudo density are initialized via finite element method. This method is controlled by the constraint factors, and the improved method combining with Rational Approximation of Material Properties (RAMP) density-stiffness interpolation model with optimality criteria methods (OC), the vertical tail’s stiffness optimization has been finished. The density-stiffness interpolation model, the mathematical model of variable density method with constraint factor, the structural optimization model, the solution model of the OC method, the design variables iterative format, are given in this paper and the algorithm with Matlab program is realized. Lastly, a sample vertical tail case is introduced to validate the feasibility of the algorithm by operating the results and analyzing the data.

Stochastic Topology Optimization of Continuum Structure

2011 ◽  
Vol 101-102 ◽  
pp. 666-669
Author(s):  
Jing Kui Li ◽  
Yi Min Zhang
Keyword(s):  
Finite Element Method ◽  
Topology Optimization ◽  
Nearest Neighbor ◽  
Random Numbers ◽  
Structural Stress ◽  
Random Parameters ◽  
K Nearest Neighbor ◽  
Numerical Examples ◽  
Continuum Structure ◽  
The Continuum

By assuming that the random parameters of a continuum structure obey the normal distribution, this paper utilized “normrnd” function in Matlab software to generate pseudo random numbers, analyzed structural stress by using finite element method, conducted topology optimization by using k nearest neighbor (KNN) method, and as such, the continuum structure has been stochastic topology optimized. The paper put forward the concept of “stochastic topology optimization”. Numerical examples are given. The results show that the stochastic topology optimization of continuum structure with random parameters is necessary.

scholarly journals Genetic Algorithms As an Approach to Configuration and Topology Design

1993 ◽  
Author(s):  
Colin D. Chapman ◽  
Kazuhiro Saitou ◽  
Mark J. Jakiela
Keyword(s):  
Genetic Algorithm ◽  
Topology Optimization ◽  
Structural Optimization ◽  
Optimization Technique ◽  
Topology Design ◽  
Structural Topology Optimization ◽  
Structural Topology ◽  
Element Analysis ◽  
Structure Topology ◽  
Design Representation

Abstract The Genetic Algorithm, a search and optimization technique based on the theory of natural selection, is applied to problems of structural topology optimization. Given a structure’s boundary conditions and maximum allowable design domain, a discretized design representation is created. Populations of genetic algorithm “chromosomes” are then mapped into the design representation, creating potentially optimal structure topologies. Utilizing genetics-based operators such as crossover and mutation, generations of increasingly-desirable structure topologies are created. In this paper, the use of the genetic algorithm (GA) in structural topology optimization is presented. An overview of the genetic algorithm will describe the genetics-based representations and operators used in a typical genetic algorithm search. After defining topology optimization and its relation to the broader area of structural optimization, a review of previous research in GA-based and non-GA-based structural optimization is provided. The design representations, and methods for mapping genetic algorithm “chromosomes” into structure topology representations, are then detailed. Several examples of genetic algorithm-based structural topology optimization are provided: we address the optimization of beam cross-section topologies and cantilevered plate topologies, and we also investigate efficient techniques for using finite element analysis in a genetic algorithm-based search. Finally, a description of potential future work in genetic algorithm-based structural topology optimization is offered.

Structural Topology Optimization of the Column of Form Grinding Machine

2010 ◽  
Vol 455 ◽  
pp. 397-401
Author(s):  
S.G. Yao ◽  
Hang Li
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
Optimization Method ◽  
Structural Topology Optimization ◽  
Structural Topology ◽  
Constraint Condition ◽  
Structural Dynamic ◽  
Structural Dynamic Model ◽  
Grinding Machine ◽  
Topology Optimization Method

Based on Topology optimization method of continuum the structural dynamic model has been built by constraint condition of volume and objective function of column natural frequency. In order to improve precision the dynamic characteristics of non-design region have been considered in optimization process. The column of structural optimization design has been done by applying topology optimization. The quality has not only reduced, but also the dynamic characteristic of the column has been improved. Thus the design effect has been reached.

Topology Optimization Design of Pure Electric Unitized Body

2014 ◽  
Vol 574 ◽  
pp. 167-172
Author(s):  
Zhe Zhang ◽  
Ying Chao Zhang ◽  
Jing Mei Jin ◽  
Bo Guo ◽  
Ming Chi ◽  
...  
Keyword(s):  
Topology Optimization ◽  
Optimization Design ◽  
3D Model ◽  
Shell Element ◽  
Element Model ◽  
Beam Element ◽  
Design Team ◽  
Structural Topology Optimization ◽  
Structural Topology ◽  
The Future

According to the model devised by the design team of PACE Future Bus and the layout size of pure electric coaches in the market, we used CATIA to make a 3D model and made Topology optimization design by using HyperWorks. After that, we imposed loading according to specific conditions and made structural topology optimization and sized optimization design. Then we checked the coach skeleton beam element model and the strength of shell element model. Finally, the future bus frame was built completely.

Topology Optimization Design of Spacecraft Antenna Pedestal Structure under Random Excitations

2014 ◽  
Vol 711 ◽  
pp. 542-545
Author(s):  
Hu Liu ◽  
Ji Hong Zhu ◽  
Wei Hong Zhang
Keyword(s):  
Topology Optimization ◽  
Optimization Model ◽  
Optimization Design ◽  
Dynamic Responses ◽  
Structural Topology ◽  
Inertial Load ◽  
Acceleration Response ◽  
Detailed Design ◽  
Dynamic Performances ◽  
Random Acceleration

The purpose of this paper is to demonstrate a topology optimization design of the spacecraft antenna pedestal structure to save the structural weight as well as maintain the dynamic performances. The dynamic responses under random acceleration excitations are analyzed firstly and then the peaks of acceleration response are equaled to be static inertial load in the topology optimization as an expedient method. The pseudo-density based topology optimization model considering stress under inertial load as constraint is then formulated, and then further detailed design of the pedestal is carried out according to the optimized structural topology. Compared with the initial design, the optimized structure is improved with the total weight saved and both the dynamic responses and static stress satisfied.

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