主动可调谐压电超材料梁的宽带振动抑制优化
An active tunable piezoelectric metamaterial beam for broadband vibration suppression by optimization
高玉强 1王立峰1
作者信息
- 1. State Key Laboratory of Mechanics and Control for Aerospace Structures,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China
- 折叠
摘要
压电超材料在带隙调控方面已经得到了广泛的应用,然而,在工程应用中,宽带振动抑制是仍存在着挑战.在本文中,设计了一中包含多个压电单元的压电超胞结构,并提出一种压电超材料梁的优化方法用于拓宽超材料振动抑制的频率范围.采用遗传算法对压电单元中的LR分流电路进行优化.通过优化将多个局部共振带隙耦合到布拉格带隙中.同时可定制超材料的衰减常数,并优化得到最大带宽.为验证优化方法的正确性以及宽频振动抑制能力,利用合成电路模拟LR电路中的可调电感,通过调节电感,实验实现了可调节的振动抑振能力.实验结果还表明,优化后的超材料可拓宽振动抑制频率范围.实验验证了超材料宽频可调节的振动抑振能力.本文为宽带振动抑制提供了一种新的方法和途径.
Abstract
Piezoelectric metamaterials with shunt circuits have been widely studied for bandgap tuning.However,broadband vibration suppression is a great challenge in engineering applications.In this paper,a novel approach to address the challenge of achieving broadband vibration suppression in piezoelectric metamaterials with shunt circuits is presented.A piezoelectric supercell model containing multiple piezoelectric units is designed.In complex band structures,it is difficult to analytically couple multiple bandgaps to form a wider bandgap.An optimization method for a piezoelectric metamaterial beam with LR circuit is proposed to broaden the frequency range of vibration suppression.The electrical parameters of the LR circuit of the supercell are optimized by a genetic algorithm.Multiple locally resonant bandgaps are coupled to the Bragg bandgap by the optimization method.The attenuation rate can be customized,and the maximum bandwidth is obtained.It is verified that the optimized metamaterial can achieve vibration suppression in a wide frequency range by the transmissibility of the finite period metamaterial beam.Vibration suppression over a wide frequency range is verified by the finite element method.Finally,a synthetic circuit is used to simulate an adjustable inductor in an LR circuit,and the vibration suppression performance of the optimized metamaterial is experimentally verified.The experimental results show that the attenuation bandwidth of meta-materials is significantly broadened through optimization.The vibration suppression capability of wide frequency tunable is realized experimentally.This paper provides a novel way for broadband vibration suppression.
关键词
Optimization/Broadband vibration suppression/Piezoelectric metamaterial/Tunable bandgapKey words
Optimization/Broadband vibration suppression/Piezoelectric metamaterial/Tunable bandgap引用本文复制引用
基金项目
National Science Fund for Distinguished Young Scholars(11925205)
National Natural Science Foundation of China(51921003)
出版年
2024
NETL
NSTL
万方数据