A Combined Tuned Absorber and Impact Damper

  • Dyrbye, Claes (Project Manager)
  • Collette, Frederic Sebastien (Project Participant)

Project Details

Description

Ph.D. project by Frederic Collette.
Tuned vibration absorbers are passive controllers of excessive vibrations around the resonant frequencies of lightly damped structures. This thesis deals with a vibration absorber combining a tuned absorber with an impact damper.
The viscous damped tuned absorber, the so-called Tuned Mass Damper (TMD), is presented to give an overview of this conventional absorber. The analytical optimization procedure for the TMD is described and an analysis of the sensitivity of the effectiveness of the TMD to variations of its parameters is conducted. A magnetic implementation of the TMD is tested on a steel frame and the experimental measurements are compared with the analytical and computational results.
The vibration control capability of two different implementations of the combined tuned absorber and impact damper is investigated in the vicinity of the fundamental mode of the considered steel frame under a random excitation.
The combined tuned absorber and 'suspended' impact damper considers the impact damper to follow a totally free translation between each collision. The numerically simulated results are compared to experimental measurements. The effectiveness of the optimal combined absorber is evaluated numerically and its sensitivity to varaiations of the clearance, the coefficient of restitution and the mass ratio between the impact damper and the tuned absorber is analyzed.
The combined tuned absorber and 'rolling/sliding' impact damper considers the impact damper as a ball rolling and sliding directly on the tuned absorber between each collision. The numerically simulated results are compared to experimental measurements. The effectiveness of the optimal combined absorber is evaluated numerically and its sensitivity to variations of the clearance, the coefficient of restitution, the coefficient of friction and the mass ratio between the impact damper and the tuned absorber is analyzed.
StatusActive
Effective start/end date01/08/1994 → …