Experimental and mathematical model of a novel viscoelastic bio-inspired multi-dimensional vibration isolation device

Abstract

The earthquake usually causes multi-dimensional vibration for the large span grid structure, how to effectively isolate and mitigate the vibration response of structure is an important problem in engineering. In this paper, a novel viscoelastic bio-inspired multi-dimensional vibration isolation (VBM-VI) device is proposed under the inspiration of bionic design of the bird legs, which possesses multi-dimensional vibration isolation performance by constituting of viscoelastic core pad and VE-LLS device together. The property experiment of the VBM-VI device is performed to explore the mechanical performance at vertical and horizonal directions, the hysteretic curves and characteristic parameters are discussed to reveal the influence of the excitation frequency and amplitude on the mechanical properties of the VBM-VI device, the experimental results show that the mechanical properties express significant frequency and amplitude dependence at vertical and horizontal directions. To further describe the mechanical proprieties of the VBM-VI device, the mathematical models are established at vertical and horizontal directions respectively, and the comparison analysis between experimental and theoretical results indicates that the established mathematical models can precisely describe mechanical performance of the VBM-VI device.

Keywords:

• Multi-dimensional vibration isolation
• bionic design
• property test
• viscoelastic material
• mathematical model

Acknowledgements

The authors would like to give thanks to reviewers for the useful comments and constructive suggestion, which do help us a lot in improving the quality of this paper.

Additional information

Funding

The authors acknowledge financial supports for this research from The National Key R&D Programs of China with Grant (2019YFE0121900), Key Research and Development Program of Anhui Province (202104g01020002) and National Natural Science Foundation of China (Grant No. 52208503).