Improved NSGA-II and its application in BIW structure optimization

Based on the crowding distance algorithm of Non-Dominated Sorting Genetic Algorithm-II (NSGA-II), three improved algorithms are proposed: side length optimization strategy, diagonal optimization strategy, center optimization strategy. Zero-Ductility Transition (ZDT) series functions and Diode-Transi...

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Published in:Advances in mechanical engineering 2023-02, Vol.15 (2)
Main Authors: Wu, Xiao, Chen, Zhiyong, Liu, Tao, Song, Haisheng, Wang, Zhiwei, Shi, Wenku
Format: Article
Language:English
Subjects:
Avalanche diodes
Ductile-brittle transition
Genetic algorithms
Mathematical analysis
Optimization
Sorting algorithms
Stiffness
Transistor logic
Transistors
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Liu, Tao
Song, Haisheng
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Shi, Wenku
description Based on the crowding distance algorithm of Non-Dominated Sorting Genetic Algorithm-II (NSGA-II), three improved algorithms are proposed: side length optimization strategy, diagonal optimization strategy, center optimization strategy. Zero-Ductility Transition (ZDT) series functions and Diode-Transistor Logic with Zener diode (DTLZ) series functions are used to calculate and compare the convergence and diversity of three improved algorithms and NSGA-II. The center optimization strategy based NSGA-II is confirmed to be the optimal algorithm. The body-in-white (BIW) optimization functions are established and optimized by center optimization strategy based NSGA-II, and the most appropriate BIW structure is calculated and verified by mode tests. The result shows: after the optimization, the BIW total mass increment is less than 3%, the first torsional mode frequency increment is more than 15%, and the torsion stiffness increment is more than 10%.
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subjects Avalanche diodes
Ductile-brittle transition
Genetic algorithms
Mathematical analysis
Optimization
Sorting algorithms
Stiffness
Transistor logic
Transistors
title Improved NSGA-II and its application in BIW structure optimization
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