Vibro-impact attachments as shock absorbers

Abstract

Abstract: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.

Analytic treatment of a system with a vibro-impact nonlinear energy sink

“…In computational studies on optimization of the performance of the system with VI NES [9,15,23] the values of the optimal restitution coefficient were close to those used here. The methodology presented above can be used for analysis of damped response in systems with more complicated NES configurations, for instance, including elastic components, one-sided impacts etc.…”

“…To date, all attempts to describe the dynamics of the vibro-impact NES were concentrated around numeric simulations of conservative and damped dynamics [9,11,23]. For smooth NESs, approximate analytic description of transient damped responses has been achieved by singular perturbation approach, based on averaging and multiple scales analysis [11,12,24].…”

Numerical and experimental investigations of a rotating nonlinear energy sink

“…The damping in Type I and Type III NESs is linear, whereas it is nonlinear in the Type II NES [9]. More recently, strongly nonlinear inertia coupling between a rotating NES mass and the primary linear structure has been employed in a rotating NES design [10][11][12], while strongly nonlinear vibro-impact coupling has been employed in [13][14][15][16][17][18][19][20][21]. The basic mechanism for inducing TET through the NESs takes place through a single mode resonance capture, or a series of resonance captures, namely resonance capture cascades [1][2][3][4][5][6][7][8][10][11][12].…”

Introduction to a topical issue ‘nonlinear energy transfer in dynamical and acoustical Systems'

“…Among other applications, one can mention targeted energy transfer in essentially nonlinear systems with applications to energy absorption and harvesting [12][13][14][15][16][17][18][19][20][21][22][23][24], wave propagation, mitigation, energy redistribution and arrest in granular crystals and in systems characterized as 'sonic vacua' (i.e. with zero linear speed of sound) [25][26][27][28][29][30][31][32], dynamic and acoustic non-reciprocity, as well as wave tailoring and control by means of acoustic metamaterials composed essentially nonlinear elements [33][34][35][36].…”