Structural Engineering and Mechanics

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Dynamic characteristics of multiple inerter-based dampers for suppressing harmonically forced oscillations

  • Chen, Huating (Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology, Guangzhou University) ;
  • Jia, Shaomin (College of Civil Engineering, Sichuan Agricultural University) ;
  • He, Xuefeng (Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology, Guangzhou University)
  • Received : 2019.03.31
  • Accepted : 2019.08.12
  • Published : 2019.12.25
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Abstract

Based on the ball-screw mechanism, a tuned viscous mass damper (TVMD) has been proposed, which has functions of amplifying physical mass of the system and frequency tuning. Considering the sensitivity of a single TVMD's effectiveness to frequency mistuning like that of the conventional tuned mass damper (TMD) and according to the concept of the conventional multiple tuned mass damper (MTMD), in the present paper, multiple tuned mass viscous dampers (MTVMD) consisting of many tuned mass dampers (TVMD) with a uniform distribution of natural frequencies are considered for attenuating undesirable vibration of a structure. The MTVMD is manufactured by keeping the stiffness and damping constant and varying the mass associated with the lead of the ball-screw type inerter element in the damper. The structure is represented by its mode-generalized system in a specific vibration mode controlled using the mode reduced-order method. Modal properties and fundamental characteristics of the MTVMD-structure system are investigated analytically with the parameters, i.e., the frequency band, the average damping ratio, the tuning frequency ratio, the total number of TVMD and the total mass ratio. It is found that there exists an optimum set of the parameters that makes the frequency response curve of the structure flattened with smaller amplitudes in a wider input frequency range. The effectiveness and robustness of the MTVMD are also discussed in comparison with those of the usual single TVMD (STVMD) and the results shows that the MTVMD is more effective and robust with the same level of total mass.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, Guangzhou University

This work was supported by the National Natural Science Foundation of China (Grant no. 51808154), the National Key R&D Program of China (Grant no.2017YFC0703600) and the Scientific Research Founding for introduced talents of Guangzhou University (Grant no.2809952).

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