Ultra-low frequency broadband gap optimization of 1D periodic structure with dual power-law acoustic black holes. (March 2022)

• Record Type: Journal Article
• Authors: Sheng, Hui; He, Meng-Xin; Lyu, Xiao-Fei; Ding, Qian
• Is Part Of: Journal of intelligent material systems and structures. Volume 33:Number 4(2022)
• Page Start: 532
• Page End: 546
• Publication Date: 2022-03
• Subjects: Acoustic black hole -- ultra-low broadband gaps -- multi-objective design -- periodic ABHs structure; Smart materials -- Periodicals; Intelligent control systems -- Periodicals; Artificial intelligence -- Periodicals; Matériaux intelligents -- Périodiques; Commande intelligente -- Périodiques; Intelligence artificielle -- Périodiques; 620.11
• DOI: 10.1177/1045389X211018841
• Languages: English
• ISSNs: 1045-389X

Abstract

The acoustic black hole (ABH) structure has gradually become a research hotspot in recent years due to its ascendant capacity of vibration attenuation and energy accumulation. To further improve the performance of vibration and noise reduction, the ultra-low frequency broadband gap of a one-dimensional structure embedded ABHs with power-law material properties is investigated in this paper. Based on the Euler-Bernoulli theory, the Transfer Matrix Method (TMM) is used to establish the dynamic model of the dual power-law ABH (DP-ABH) beam. The band structure results obtained by TMM and the finite element method are compared with each other to verify the ultra-low broadband gap of the structure. Comparison with the traditional ABH show that the ultra-low frequency performance of the DP-ABH is due to the enhanced local resonator properties with reduction of dual power-law local stiffness. Parameter analysis served as a guide for optimization is carried out and a method of combining NSGA-II and TMM is applied to optimize the ABH section with full parameters, to consider a trade-off between lower bandgaps and higher stiffness. The investigation shows that the ultra-low broadband gaps of the periodic DP-ABHs structure, which meets adequate stiffness requirements, can be designed by optimized configuration.