Resumo

LEDEZMA-RAMIREZ, Diego Francisco et al. Shock response of a two-stage vibration isolation system. Ing. invest. y tecnol. [online]. 2020, vol.21, n.2, e1617.  Epub 13-Nov-2020. ISSN 2594-0732.  https://doi.org/10.22201/fi.25940732e.2020.21n2.018.

Two-degree of freedom system, or two-stage mount are used to improve the high frequency vibration isolation performance with the disadvantage of increasing the mass of the system and adding a second resonance. The vibration isolation property is a well-understood topic for harmonic vibration considering linear and nonlinear elements, but not its shock response. The absolute and relative response of a two-stage mount under shock excitation is investigated in this paper. The effects of the damping ratio and the mass ratio of the two stage mount on the shock response are analysed. The potential advantages and issues behind this system are discussed and compared with the well-known single mount. Experimental validation was performed using two commercially available isolators and different masses. Findings suggested that a large mass ratio could reduce the shock response in terms of absolute motion. This effect is only significant for the case of short pulses and when the mass ratio is at least five. It is also found that is useful to have light damping only on the secondary stage as it results in improved shock isolation.

Palavras-chave : Vibration isolation; two-stage system; shock response; two-degree of freedom; linear isolator.