Syndiotactic chiral metastructure with local resonance for low-frequency vibration isolation

• Published in: International journal of mechanical sciences 2024-11, Vol.281, p.109564, Article 109564
• Main Authors: Zhang, Rui, Ding, Wei, Fang, Bowei, Feng, Peicheng, Wang, Kaixiang, Chen, Tianning, Zhu, Jian
• Format: Article
• Language: English
• Subjects: Bandgap; Chiral inertial amplification; Local resonance; Metastructures; Syndiotacticity; Vibration isolation
• ISSN: 0020-7403
• DOI: 10.1016/j.ijmecsci.2024.109564

•Chiral resonator-based metastructure for low-frequency bandgap opening.•Double attenuation notches in coupling metastructure.•Lower-frequency bandgap metastructure under equal mass and equal stiffness. Isolating low-frequency vibrations is a challenge in engineering due to their long wavelength. The bandgap within inertial amplification metastructures has proven to be an effective solution for isolating low-frequency vibrations. In this study, a chiral local resonator is proposed and integrated into a syndiotactic chiral inertial amplification metastructure (SCM) to create a low-frequency bandgap. Under equal mass and stiffness conditions, SCM-CR exhibits a bandgap starting frequency 32.3 % lower than that of traditional metastructures with traditional local resonators (TM-TR), and the normalized width of the bandgap is 31.7 % wider than TM-TR. The low-frequency bandgap is attributed to the presence of chiral local resonators. The inertial amplification effect induced by the chiral structure results in a resonance frequency lower than that of local resonators with equivalent mass and stiffness. Within the low-frequency bandgap, the transmission of the SCM-CR proposed in this study exhibits double attenuation notches over a specific number of periods, leading to the normalized width of the deep attenuation region 45.8 % broader than that of traditional metastructures with chiral local resonators (TM-CR). The tunability of the bandgap has also been investigated. Experimental results verified the double attenuation notches and the tunability of the bandgap. This work provides a promising solution for low-frequency vibration isolation. [Display omitted]