TY - JOUR
T1 - On the influence of internal oscillators on the performance of metastructures
T2 - Modelling and tuning conditions
AU - Kovacic, Ivana
AU - Teofanov, Ljiljana
AU - Kanovic, Zeljko
AU - Zhao, Jianlei
AU - Zhu, Rui
AU - Rajs, Vladimir
N1 - Publisher Copyright:
© 2023 Elsevier Ltd
PY - 2023/12/15
Y1 - 2023/12/15
N2 - A longitudinally excited metastructure with periodically distributed internal oscillators is considered with a view to determining how the tuning condition between their frequency and the frequency of the metastructure as a whole affects vibration attenuation. First, the mechanical model is created, and the tuning condition related to the first resonance frequency of the metastructure with blocked internal oscillators and the first resonance frequency of internal oscillators themselves is obtained in an original analytical form. Then, this condition is used to design the stiffness of the internal oscillators and they are allowed to oscillate in the metastructure, yielding vibration attenuation around the first resonance. The influence of the number of internal oscillators as well as the mass ratio between the mass of one internal oscillator and external oscillator of the metastructure is investigated. Experimental validations, accompanied with numerical results, of these theoretical results are provided subsequently. In addition, the theoretical concept is extended to other resonances, demonstrating its adaptivity and generality, and these cases are then validated via numerical experiments in FEM simulations.
AB - A longitudinally excited metastructure with periodically distributed internal oscillators is considered with a view to determining how the tuning condition between their frequency and the frequency of the metastructure as a whole affects vibration attenuation. First, the mechanical model is created, and the tuning condition related to the first resonance frequency of the metastructure with blocked internal oscillators and the first resonance frequency of internal oscillators themselves is obtained in an original analytical form. Then, this condition is used to design the stiffness of the internal oscillators and they are allowed to oscillate in the metastructure, yielding vibration attenuation around the first resonance. The influence of the number of internal oscillators as well as the mass ratio between the mass of one internal oscillator and external oscillator of the metastructure is investigated. Experimental validations, accompanied with numerical results, of these theoretical results are provided subsequently. In addition, the theoretical concept is extended to other resonances, demonstrating its adaptivity and generality, and these cases are then validated via numerical experiments in FEM simulations.
KW - Frequency
KW - Internal oscillators
KW - Mass
KW - Metastructure
KW - Tuning
KW - Vibration attenuation
UR - http://www.scopus.com/inward/record.url?scp=85173887019&partnerID=8YFLogxK
U2 - 10.1016/j.ymssp.2023.110861
DO - 10.1016/j.ymssp.2023.110861
M3 - Article
AN - SCOPUS:85173887019
SN - 0888-3270
VL - 205
JO - Mechanical Systems and Signal Processing
JF - Mechanical Systems and Signal Processing
M1 - 110861
ER -