An uncertainty-based structural design and optimization method with interval Taylor expansion

Structures ◽  
2021 ◽  
Vol 33 ◽  
pp. 4492-4500
Author(s):  
Debiao Meng ◽  
Zhengguo Hu ◽  
Jinbao Guo ◽  
Zhiyuan Lv ◽  
Tianwen Xie ◽  
...  
Keyword(s):  
Structural Design ◽  
Taylor Expansion ◽  
Optimization Method ◽  
Design And Optimization

scholarly journals Lightweight Threshing Rack under Multisource Excitation Based on Modal Optimization Method

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Haotian Zhang ◽  
Zhong Tang ◽  
Yu Li ◽  
Xin Liu ◽  
Hui Ren
Keyword(s):  
Structural Design ◽  
Excitation Frequency ◽  
Optimization Method ◽  
Mode Shapes ◽  
Stress And Strain ◽  
Original Design ◽  
Design And Optimization ◽  
Finite Element Software ◽  
Combine Harvester ◽  
Stress And Strain Distribution

Crawler rice combine harvester threshing rack excited by different frequencies of multiple working parts would cause strong vibration response. In this paper, the rack-type rice combine harvester threshing rack was taken as research objective, and then the static analysis of the existing threshing rack was carried out by ANSYS Finite Element software. The topology of the rack structure was optimized according to the stress and strain distribution of the threshing rack. Based on solving the 6 natural frequencies and mode shapes of the threshing rack of combine harvester, the morphological test of threshing rack was carried out and the reliability of the modal analysis was verified. Finally, the multivibration source was assembled on the rack for simulation to test and verify the optimization effectiveness. Results showed that the 1st to 6th natural frequency of threshing rack after modal optimization could avoid the excitation frequency of the working part. Compared with the original design, the optimized threshing rack had a weight reduction of 13.7%. This study can provide a theoretical reference for the structural design and optimization of combine harvester threshing rack.

Development of a Hypersonic Aircraft Design Optimization Tool

2014 ◽  
Vol 553 ◽  
pp. 847-852 ◽  
Author(s):  
Benjamin J. Morrell ◽  
David J. Munk ◽  
Gareth A. Vio ◽  
Dries Verstraete
Keyword(s):  
Structural Design ◽  
Current Practice ◽  
Thermal Stresses ◽  
Aircraft Design ◽  
Material Strength ◽  
Aircraft Structure ◽  
Aerodynamic Loads ◽  
Design And Optimization ◽  
Hypersonic Aircraft ◽  
Strength And Stiffness

The design and optimization of hypersonic aircraft is severely impacted by the high temperatures encountered during flight as they can lead to high thermal stresses and a significant reduction in material strength and stiffness. This reduction in rigidity of the structure requires innovative structural concepts and a stronger focus on aeroelastic deformations in the early design and optimisation of the aircraft structure. This imposes the need for a closer coupling of the aerodynamic and structural design tools than is current practice. The paper presents the development of a multi-disciplinary, closely coupled optimisation suite for hypersonic aircraft. An overview of the setup and structure of the optimization suite is given and the integration between the Tranair solver, used to determine the aerodynamic loads and temperatures, and MSC/NASTRAN, used for the structural sizing and design, will be given.

Design and optimization method for a two-dimensional hydrofoil

2006 ◽  
Vol 18 (S1) ◽  
pp. 316-322
Author(s):  
Ching-Yeh Hsin ◽  
Jia-Lin Wu ◽  
Sheng-Fong Chang
Keyword(s):  
Optimization Method ◽  
Two Dimensional ◽  
Design And Optimization

Structural design and optimization of large cable–rib tension deployable antenna structure with dynamic constraint

2018 ◽  
Vol 151 ◽  
pp. 160-172 ◽  
Author(s):  
Ruiwei Liu ◽  
Hongwei Guo ◽  
Rongqiang Liu ◽  
Hongxiang Wang ◽  
Dewei Tang ◽  
...  
Keyword(s):  
Structural Design ◽  
Antenna Structure ◽  
Design And Optimization ◽  
Dynamic Constraint

Parameter Design of Conformal PML Based on 2D Monostatic RCS Optimization

2021 ◽  
Vol 36 (6) ◽  
pp. 726-733
Author(s):  
Yongjie Zhang ◽  
Xiaofeng Deng
Keyword(s):  
Electromagnetic Scattering ◽  
Simulated Annealing Algorithm ◽  
Design Method ◽  
Optimization Method ◽  
Parameter Design ◽  
Design Parameters ◽  
Absorption Effect ◽  
Absorbing Boundary ◽  
Design And Optimization ◽  
Annealing Algorithm

In this study, 2D finite element (FE) solving process with the conformal perfectly matched layer (PML) is elucidated to perform the electromagnetic scattering computation. With the 2D monostatic RCS as the optimization objective, a sensitivity analysis of the basic design parameters of conformal PML (e.g., layer thickness, loss factor, extension order and layer number) is conducted to identify the major parameters of conformal PML that exerts more significant influence on 2D RCS. Lastly, the major design parameters of conformal PML are optimized by the simulated annealing algorithm (SA). As revealed from the numerical examples, the parameter design and optimization method of conformal PML based on SA is capable of enhancing the absorption effect exerted by the conformal PML and decreasing the error of the RCS calculation. It is anticipated that the parameter design method of conformal PML based on RCS optimization can be applied to the cognate absorbing boundary and 3D electromagnetic computation.

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