TITLE

Effective Location and Packing Ratio of a Particle Impact Damper for a Mild Steel Cantilever Beam Under Transient and Forced Vibration

AUTHOR(S)
Kachare, P. S.; Bimleshkumar
PUB. DATE
November 2011
SOURCE
International Review of Mechanical Engineering;Nov2011, Vol. 5 Issue 7, p1226
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Everything in universe which posses mass possesses stiffness and intrinsic damping. Due to stiffness property mass will vibrate when excited and its intrinsic damping property will tend to cease vibration. Every design engineer put his knowledge to make vibration free machine and if it is not possible to do so then attempts will be made to give proper damping effect which increases the system damping near to critical damping. Particle impact damper (PID) is a very interesting passive damper in which the impact and friction phenomenon of particles are involved, which are the means of energy dissipation. The unique aspect of PID is high damping achieved by absorbing the kinetic energy of the structure as opposed to the more traditional methods of damping where the elastic strain energy stored in the structure is absorbed and converted to heat. PID is a means for achieving high structural damping by the use of a particle filled enclosure attached to the structure. The particles absorb kinetic energy of the structure and convert it to heat through inelastic collisions between the particles & the wall of enclosure, and amongst the particles themselves also. In this work, behaviour of PID is studied for a cantilever mild steel beam with the enclosure attached at four distinct locations along beam and copper particles have been used of diameter 3mm. The effect of location and packing ratio on acceleration and displacement amplitude of beam is studied. PID is found to be highly non-linear. Perhaps the most useful observation is that the effective location is one where maximum amplitude of vibration is observed, also packing ratio influences the damper's performance. The effect of damping is studied with and without particles. A satisfactory comparison between the damping performance of beam can be observed through experiments when particles are used and when not used. The effective location of cavity was found amongst four different locations also the effective packing ratio can be identified. It was also shown that as packing ratio changes, the contribution of impact and friction phenomenon towards damping also changes. An encouraging thing is that in spite of its deceptive simplicity, the model captures the essential physics of PID.
ACCESSION #
76127874

 

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