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Tuesday, July 9 • 16:10 - 16:30

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In order to improve the high frequency isolation performance, a common solution is to use a two stage isolation mount, which is basically a two degree of freedom system. However, the benefits come at the cost of increasing the mass of the system and adding a second resonance. The isolation properties are well understood for harmonic vibration considering linear and nonlinear elements. However, its shock response has not been properly studied. In this contribution, the absolute and relative responses of a two stage mount under shock excitation is investigated, analyzing the effect of the mass ratio between the two stages. The potential advantages and issues of this isolation system are discussed and compared with the well known single mount. It is found that a large secondary mass can reduce the shock response in terms of absolute motion for certain conditions, and that it is useful to have light damping only on the primary stage. Finally, a specific experimental validation is presented.

avatar for Mohammad Rafiee

Mohammad Rafiee

Postdoctoral Fellow, Polytechnique Montréal
Mohammad Rafiee received his Ph.D. degree in Mechanical Engineering from the University of Ottawa in 2018. Currently, he is a Postdoctoral Fellow at Polytechnique Montreal in Canada. His research interests are primarily focused on the development of advanced composite materials, smart... Read More →


Tuesday July 9, 2019 16:10 - 16:30 EDT
Outremont 6
  T08 Mat. for noise & vibr. cntrl., SS02 Vibr damping materials