Vibrations of a mass-spring system using a granular-material damper

Bartkowski

2019

In the paper a proposal of granular damper prototype has been introduced. The granular damper works on the basis of a core made of Vacuum Packed Particles. Idea of Vacuum Packed Particles consists of placing loose granular grains into a hermetic envelope, wherein in the next stage a partial vacuum is generated. The difference between an atmospheric pressure, externally surrounding the core and internal one, causes occurring friction forces between single grains. Interacting friction forces are greater for higher values of internal underpressure. In presented paper the authors focus on analysis of experimental results obtained for various values of underpressure. Variations in energy dissipation possibilities are particularly described in this paper.

Section: Methodsmentioning

confidence: 99%

Prototype of a controllable damper based on granular materials subjected to partial vacuum

Bartkowski

2019

“…The smart material described in this paper can be also use for the active damping of mechanical vibration or for the crash energy absorbing. The interesting devices is the linear controllably linear damper made of VPP and described in paper [5]. Other interesting devise is the multiaxial impact damper able to absorb the impact energy [6].…”

Section: Introductionmentioning

confidence: 99%

“…From the mechanical point of view VPP behave like a elasto-plastic solid with strong hardening. It can be found in literature the plenty of results for the uniaxial test of VPP [7,8]. Scientists are also working on dynamic test of this structure and the results are presented in papers [9,10].…”

Section: Introductionmentioning

confidence: 99%

Empirical determination of the mechanical properties of Vacuum Packed Particles

Bartkowski

2019

In this work the experimental test of Vacuum Packed Particles (VPP) under 3-point bending are presented. VPP it is the structure compose of grains inside the plastomer coating. When the pressure inside is equal or higher than zero structure behave like a liquid, otherwise like a elasto-plastic solid. Three types of grain material and different values of underpressure were tested. Results presented in this paper will be used in the further work for the numerical model validation procedure.

“…Additionally, due to damping properties of the smart spring-damper device the resonance amplitude is effectively decreased. In this paper the concept of a vibration damping prototype with variable dissipation properties, based on a core made of Vacuum Packed Particles (VPP) is taken into consideration [9], [10], or [11]. These structures are constructed of granular materials (loose grains) placed in the hermetic plastomer envelope in which a partial vacuum is generated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of inertial amplification mechanism with smart spring-damper for attenuation of beam vibrations

Barys

2018

In this paper an inertial amplification mechanism with an embedded smart spring-damper device for attenuation of longitudinal vibrations in continuous structures is analyzed. The complex systems are the extension of the already investigated inertial mechanism, here additionally equipped with the vacuum controlled spring-damper device which shows features of smart materials. This allows the semi-active control to affect different frequency vibration ranges in the real time. The fea.tures of the basic inertia amplification mechanism are preserved as a possibility to generate two neighbouring anti-resonance frequencies between resonance peaks in the low frequency range.