Abstract
Impact and friction vibration absorbers are introduced in mechanical systems to attenuate their vibrations with dissipating the vibratory energy through respectively collision or friction between both bodies. However, the contact between both bodies for both cases deserves to be investigated closely. This work aims firstly to study the effect of the collision modeling on the impact absorber efficiency. The impact is modeled under several forms: linear, semi-linear, and nonlinear; accordingly to elastic and viscous behaviors. The modeling, then the formulation, then the resolution of the problem are conducted for each case. The forced responses of the system are obtained, and a comparison is made to conclude on the absorber performance. This work aims secondly to examine the effect of friction modeling on the friction absorber efficiency. Two modeling approaches are considered: macroscopic and microscopic; accordingly to physical and tribological behaviors. The problem modeling is elaborated, followed by a formulation, then a resolution, to determine the forced responses of the system for different friction models. A comparison is made later to conclude on the friction absorber performance.
Highlights
The vibration attenuation of a mechanical system equipped with an impact absorber is due to the collisions between both bodies which cause energy dissipation [1]
For each impact model, using the continuous approach, an analytic study is conducted to determine the motion equations, it a Corresponding author: Charfeddine.Mrad@enit.rnu.tn is followed by a numeric resolution to obtain the forced responses of the system equipped with the impact absorber
A comparison of the different impact models is made later to conclude on the impact absorber performance
Summary
The vibration attenuation of a mechanical system equipped with an impact absorber is due to the collisions between both bodies which cause energy dissipation [1]. The impacts are modeled using springs and dampers [2]. The contact between both bodies is to be investigated closely [3]. The vibration attenuation of a mechanical system equipped with a friction absorber is due to the friction between both bodies which causes energy dissipation [7]. That mass absorbers are widely used to reduce vibration levels [8], several studies showed that friction absorbers are more effective [9], but the contact between both bodies is to be investigated closely. A comparison of the different friction models is made later to conclude on the friction absorber performance
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