Structural Engineering and Mechanics

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Friction tuned mass damper optimization for structure under harmonic force excitation

  • Nasr, Aymen (Laboratory of Applied Mechanics and Engineering (LMAI), National School of Engineers of Tunis (ENIT), University of Tunis El Manar (UTM)) ;
  • Mrad, Charfeddine (Laboratory of Applied Mechanics and Engineering (LMAI), National School of Engineers of Tunis (ENIT), University of Tunis El Manar (UTM)) ;
  • Nasri, Rachid (Laboratory of Applied Mechanics and Engineering (LMAI), National School of Engineers of Tunis (ENIT), University of Tunis El Manar (UTM))
  • Received : 2017.06.26
  • Accepted : 2018.01.04
  • Published : 2018.03.25
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Abstract

In this work, an optimization method of Friction Tuned Mass Damper (FTMD) parameters is presented. Friction tuned mass dampers (FTMD) are attached to mechanical structures to reduce their vibrations with dissipating the vibratory energy through friction between both bodies. In order to exploit the performances of FTMD, the determination of the optimum parameters is recommended. However, the presence of Coulomb's friction force requires the resolution of a non-linear stick-slip problem. First, this work aims at determining the responses of the vibratory system. The responses of the main mass and of the FTMD are determined analytically in the sticking and sliding phase using the equivalent damping method. Second, this work aims to optimize the FTMD parameters; the friction coefficient and the tuned frequency. The optimization formulation based on the Ricciardelli and Vickery method at the resonance frequencies, this method is reformulated for a system with a viscous damping. The inverse problem of finding the FTMD parameters given the magnitude of the force and the maximum acceptable displacement of the primary system is also considered; the optimization of parameters leads to conclude on the favorable FTMD giving significant vibration decrease, and to advance design recommendations.

Keywords

References

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