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Shock and Vibration
Volume 2017 (2017), Article ID 7313809, 21 pages
Research Article

Passive Shock Isolation Utilising Dry Friction

Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, UK

Correspondence should be addressed to Mohd Ikmal Ismail

Received 11 September 2016; Accepted 4 January 2017; Published 2 February 2017

Academic Editor: Hassan Askari

Copyright © 2017 Mohd Ikmal Ismail and Neil Stuart Ferguson. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A novel shock isolation strategy for base excited system is presented by introducing a two-degree-of-freedom model with passive friction, where the friction is applied to an attached mass instead of directly to the primary isolated mass. The model is evaluated against the benchmark case of single-degree-of-freedom system with friction applied directly to the primary isolated mass. The performances of the models are compared in terms of the maximum displacement response and the acceleration during the application of the shock input for the case when the shock input duration is approximately equal to the natural period of the system (amplification region). From the results, the two-degree-of-freedom model can produce both maximum displacement reduction and smoother acceleration at the point of motion transition. An experimental rig was built to validate the theoretical results against the experimental results; it is found that the experimental results closely match the theoretical predictions.