RESEARCH ON TORSIONAL VIBRATION SUPPRESSION OF CHIRAL METAMATERIAL INERTER DYNAMIC VIBRATION ABSORBER

The inerter structure has proven to be highly effective in vibration suppression, exhibiting remarkable vibration reduction capabilities. The new type of dynamic vibration absorber combined with inerter and vibration absorber has the advantage of light weight. However, the complex design of traditional inerter structures hinders their widespread adoption in vibration control applications. In view of this limitation, a chiral metamaterial inerter dynamic vibration absorber (CIDVA) with simple and efficient inerter structure is designed in this paper. The CIDVA combines the advantages of both inerter and vibration absorber technologies, notably its lightweight design. Firstly, the compress-torsion coupling effect of chiral metamaterials is introduced, and the effect is used to amplify the torsion stroke of the inerter disk to form the inerter mechanism. In order to ensure the feasibility of the inerter mechanism, an auxiliary mechanism is designed to ensure the movement of chiral metamaterials. Secondly, the structure and working principle of CIDVA are thoroughly examined, and the finite element simulation analysis is carried out to accurately calculate and verify its inertance amplification constant. Building upon this foundation, the dynamic equation of the CIDVA-primary system is established, enabling a comprehensive study of the torsional vibration suppression abilities of the CIDVA-main system under steady-state and transient excitations. A comparison with the locked CIDVA configuration is also performed. Furthermore, the validity of the achieved inerter is meticulously analyzed. Finally, to validate the torsional vibration suppression capabilities of CIDVA on the main system, experimental verification is conducted. The simulation and experimental results demonstrate that CIDVA can effectively suppress the torsional vibration of the primary system under both transient and steady-state excitation, surpassing the performance of traditional DVA. Notably, CIDVA achieves significant weight savings, reducing its own moment of inertia by more than 10 times compared to traditional DVAs. and can save more than 10 times of its own moment of inertia compared with the traditional DVA. It provides new ideas and methods for DVA to achieve lightweight design and efficient vibration suppression. These findings contribute novel ideas and methodologies for achieving lightweight design and efficient vibration suppression in the field of DVAs. © 2023 Chinese Journal of Theoretical and Applied Mechanics Press. All rights reserved.