Optimal Design of Double-Layer Domes Considering Different Mechanical Systems via ECBO

Abstract This paper presents a new approach to optimal design of large multibody spatial mechanical systems. This approach uses symbolic computing to generate the necessary equations for dynamic analysis and design sensitivity analysis. Identification of system topology is carried out using graph theory. The equations of motion are formulated in terms of relative joint coordinates through the use of velocity transformation matrix. Design sensitivity analysis is carried out using the Direct Differentiation method applied to the relative joint coordinate formulation for spatial systems. Symbolic manipulation programs are used to develop subroutines which provide information for dynamic and design sensitivity analysis. These subroutines are linked to a general purpose computer program which performs dynamic analysis, design sensitivity analysis, and optimization. An example is presented to demonstrate the efficiency of the approach.

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Optimal Design and Analysis of Dual-Band Double-Layer Diffractive Optical Element Under Oblique Incidence

Acta Optica Sinica ◽

10.3788/aos202040.1605001 ◽

2020 ◽

Vol 40 (16) ◽

pp. 1605001

Author(s):

毛珊 Mao Shan ◽

解娜 Xie Na ◽

赵建林 Zhao Jianlin

Keyword(s):

Optimal Design ◽

Double Layer ◽

Oblique Incidence ◽

Optical Element ◽

Diffractive Optical Element ◽

Dual Band

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Cooperative game-oriented optimal design in constraint-following control of mechanical systems

Nonlinear Dynamics ◽

10.1007/s11071-020-05800-6 ◽

2020 ◽

Vol 101 (2) ◽

pp. 977-995

Author(s):

Qinqin Sun ◽

Guolai Yang ◽

Xiuye Wang ◽

Ye-Hwa Chen

Keyword(s):

Optimal Design ◽

Cooperative Game ◽

Mechanical Systems

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Comparison of four meta-heuristic algorithms for optimal design of double-layer barrel vaults

International Journal of Space Structures ◽

10.1177/0266351118803019 ◽

2018 ◽

Vol 33 (3-4) ◽

pp. 115-123

Author(s):

Ali Kaveh ◽

Majid Ilchi Ghazaan ◽

Soroush Mahjoubi

Keyword(s):

Optimal Design ◽

Double Layer ◽

Heuristic Algorithms ◽

Size Optimization ◽

Community Centers ◽

Cross Sectional ◽

Long Span ◽

Design Variables ◽

Rail Station ◽

Barrel Vaults

Barrel vaults are effective semi-cylindrical forms of roof systems that are widespread for multipurpose facilities including warehouse, rail station, pools, sports center, airplane hungers, and community centers because of providing long-span and economical roof with significant amount of space underneath. In the present study, size optimization of double-layer barrel vaults with different configurations is studied. Four recently developed algorithms consisting of the CBO, ECBO, VPS, and MDVC-UVPS are employed and their performances are compared. The structures are subjected to stress, stability, and displacement limitations according to the provisions of AISC-ASD. The design variables are the cross-sectional areas of the bar elements which are selected from steel pipe sections. The numerical results indicate that the MDVC-UVPS outperforms the other algorithms in finding optimal design in all examples.

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