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| Equivalent mechanical model and vibration reduction performance analysis of a non-packed particle damper |
| LI Xiaojun1，TIAN Chaojie1，HUANG Xuhong2 |
| 1.Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology,Beijing 100124, China; 2.School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, China |
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Abstract To consider the impact of time effects during collision on the vibration reduction performance and mechanism of non-packed particle damper (NPPD), an equivalent single particle mechanical model based on contact element method (EISM-CE) is proposed on the basis of existing mechanical model (EISM), and a corresponding solving algorithm of motion state of NPPD-single degree of freedom structure is suggested based on the Runge Kutta algorithm. The shaking table test of a single-layer steel frame structure with additional NPPD was also designed and conducted. The influence of filling ratio on the frequency response curve of structural displacement was explored. Further validation and comparative analysis of the EISM-CE model was conducted based on the proposed model parameter determination principle. On the basis of verifying the rationality of the equivalent model, the numerical analysis on the vibration reduction effect and energy change law under free vibration, harmonic excitation, and recorded strong ground motion was carried out subsequently. The results show that the EISM-CE model and the corresponding determination principle of model parameters are more reasonable and effective than the existing EISM. The results of the numerical analysis show that NPPD has good damping performance under different excitations. The damping performance and mechanism of EISM-CE are somewhat different from EISM after considering the collision time effect.
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Received: 29 June 2023
Published: 28 March 2024
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