Practical non-linear vibration absorber design

The use of vibro-impact (VI) attachments as shock absorbers is studied. By considering different configurations of primary linear oscillators with VI attachments, the capacity of these attachments to passively absorb and dissipate significant portions of shock energy applied to the primary systems is investigated. Parametric studies are performed to determine the dependence of energy dissipation by the VI attachment in terms of its parameters. Moreover, non-linear shock spectra are used to demonstrate that appropriately designed VI attachments can significantly reduce the maximum levels of vibration of primary systems over wide frequency ranges. This is in contrast to the classical linear vibration absorber, whose action is narrowband. In addition, it is shown that VI attachments can significantly reduce or even completely eliminate resonances appearing in the linear shock spectra, thus providing strong, robust, and broadband shock protection to the primary structures to which they are attached.

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NON-LINEAR VIBRATION ABSORBER FOR A SYSTEM UNDER SINUSOIDAL AND RANDOM EXCITATION: EXPERIMENTS

Journal of Sound and Vibration ◽

10.1006/jsvi.2001.3836 ◽

2002 ◽

Vol 249 (4) ◽

pp. 701-718 ◽

Cited By ~ 11

Author(s):

O. CUVALCI ◽

A. ERTAS ◽

S. EKWARO-OSIRE ◽

I. CICEK

Keyword(s):

Random Excitation ◽

Vibration Absorber ◽

Linear Vibration ◽

Non Linear

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The dynamics and design of a non-linear vibration absorber

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/pime_proc_1993_207_143_02 ◽

1993 ◽

Vol 207 (6) ◽

pp. 363-374 ◽

Cited By ~ 6

Author(s):

D H Gonsalves ◽

R D Neilson ◽

A D S Barr

Keyword(s):

Numerical Simulation ◽

Equations Of Motion ◽

Resonance Peak ◽

Vibration Absorber ◽

Linear Vibration ◽

Frequency Range ◽

Non Linear ◽

Experimental Rig ◽

Auxiliary Mass

This paper presents the design of an efficient non-linear vibration absorber. The system comprises a linear absorber with the addition of a spring between the two masses, which contacts the absorber mass when its displacement exceeds a certain value. The addition of this snubber stiffness facilitates a reduction in the amplitude of the second resonance peak of the linear absorber, which therefore enables the system to be operated over a wider frequency range without reaching larger amplitudes. The modification also has the effect of attenuating the response of the auxiliary mass. The equations of motion for the system are presented and optimization is carried out. A description of an experimental rig that was built follows. The results from the rig are compared with those from numerical simulation and show good correlation.

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