The effect of coulomb friction on the residual vibration of a shock isolation system


Ismail, M.I., Brennan, M.J. and Ferguson, N.S. (2010) The effect of coulomb friction on the residual vibration of a shock isolation system. In, Brennan, M.J., Kovacic, Ivana, Lopes, V., Murphy, K., Petersson, B., Rizzi, S. and Yang, T. (eds.) Recent Advances Structural Dynamics: Proceedings of the X International Conference. Southampton, GB, University of Southampton, 12pp.

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Description/Abstract

An ideal shock isolation system should have low stiffness, at least reduced during a shock input, to prevent problems caused by shock inputs of duration similar to the natural period of the system. Ideally, there should be some form of energy dissipation to attenuate the residual vibration, but it must not adversely affect the response during the shock. This paper concerns the control of the residual vibration using friction. It is incorporated into the system by letting a small secondary mass, attached to the main mass by a spring, slide on a friction interface fixed to the ground to provide dissipation.

In the limiting cases of no friction and an extremely high level of friction, the combined system acts as a linear system which can be represented by two degree-of-freedom and single degree-of-freedom models respectively. These two extreme cases serve as benchmarks for subsequent numerical investigation of the dynamics of the combined friction system, when parameters such as the frequency ratio and mass ratio of the systems are varied.

The dynamic behaviour of the friction system is complex and different to a linear system. A comparison is given of the system response with and without friction and the optimum friction that is needed to bring a system back to its equilibrium without oscillation is investigated.

Item Type: Book Section
Additional Information: Paper No.166 (Format - USB Pen Drive)
ISBNs: 0854329102 (paperback)
9780854329106 (paperback)
Keywords: shock isolation, coulomb friction
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Q Science > QC Physics
Divisions: University Structure - Pre August 2011 > Institute of Sound and Vibration Research > Dynamics
ePrint ID: 160681
Date Deposited: 20 Jul 2010 15:30
Last Modified: 27 Mar 2014 19:16
Publisher: University of Southampton
URI: http://eprints.soton.ac.uk/id/eprint/160681

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