Vibro‐Impact Dynamics

Luo, Albert C. J.; Guo, Yu

doi:10.1002/9781118402924

Cited by 66 publications

(45 citation statements)

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“…Vibro-impact appears in many engineering applications, such as hand-held percussion machines, pile driving machines, periodic rubbing between the rotor blades and the stators in turbomachinery, braking systems in automobiles and cutting and grinding machines [9][10][11][12]. Vibro-impact systems have been studied extensively in different contexts.…”

Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Ouyang

Davis

2018

Nonlinear Dyn

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A triboelectric energy harvester based on a three-degree-of-freedom vibro-impact oscillator is presented. Both the dynamic model of the oscillator and the theoretical model of the oscillator-based triboelectric energy harvester are established. The dynamic response and its effect on the electrical output are considered for various mass ratios and mass spacings. The study leads to the conclusions that the symmetric mass configurations of the oscillator are more beneficial to energy harvesting than the asymmetric cases. The extent of the initial spacing between the masses influences the dynamics of the system and the electrical output by triggering grazing bifurcation. High-order periodicity is found to accompany a reduction in the electrical power. An increase in mass ratio tends to increase the electrical output, and there may exist an optimal mass ratio at which the electrical output is maximized. Chatter and sticking motion can improve the output performance dramatically, while resonance, as usual, corresponds to large amplitude response, but these large amplitudes are not optimal for triboelectric energy harvesting, and thus the maximal output does not appear around resonance. This is different from other types of vibration-based energy harvesters, such as piezoelectric and magneto-

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Section: Vibro-impact Systems In Energy Harvestingmentioning

confidence: 99%

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Ouyang

Davis

2018

Nonlinear Dyn

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“…In addition, it is natural to assume that all impact pairs act under the same hypothesis of interaction. Under the assumption of a conservative system, the equations of motion for k=1,...,N and boundary conditions take the form (15) where u k ≤ Δ and the clap, first, is assumed to be perfectly elastic (see below).…”

Section: Periodic Claps In the Elastic Chainmentioning

confidence: 99%

“…Let us consider the equation of motion (15), assuming that at the interaction in the contact zone the bodies are subjected to equal dissipative forces g( k u  ). Let us assume, in addition, that during the motion the interacting bodies are subjected to a force of viscous friction that depends on the absolute velocities of the bodies.…”

Section: Resonant Modes In a Three-span Chainmentioning

confidence: 99%

“…Let us assume that in the system free periodic fluctuations settle. Then, in definitory relations in Section 4 and below we turn to the density of the parameters and record the density of the elastic impact forces acting at x∈[x k , x k +h k ] through the density of the impact momentum I(x), the phase distribution φ(x) and the distribution of the interaction time [15] (32)…”

Section: Calculation Of Pipe Vibro-impact Systemmentioning

confidence: 99%

“…Equating to zero brace (27), it is possible to find the frequency corresponding to the infinite pulses, i.e., the frequencies of maximum vibration wear. Let us perform calculations using the following geometrical and physical characteristics of round tube [15] The calculations took account of 22 terms of the series (37). Verification of convergence was carried out numerically.…”

Section: A Three-span Tubementioning

confidence: 99%

See 2 more Smart Citations

The Analysis of Non-Newtonian Vibro-Impact Processes in Tube Constructions and Systems with Parallel Impact Pairs

Krupenin

Vība

2017

Latvian Journal of Physics and Technical Sciences

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The present paper studies the problems of creation of techniques for the analysis of vibro-impact processes in systems with a large number of impact pairs. The used method of singularisation allows refusing from the ideas of the momentary impact and considering interaction hypotheses, which are more realistic than Newtonian ones. We consider the features of synchronous modes of movements of the clap type in systems with parallel impact elements as well as in tubes colliding with intermediate supports. Such modes are most dangerous in terms of the vibration wear of structural elements. The examples of calculation are given for specific designs.

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Dynamics of a hybrid vibro‐impact nonlinear energy sink

2019

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Nonlinear energy sink (NES) is widely studied as a solution for energy harvesting and vibration mitigation problems under periodic, impulsive and stochastic excitations. Current work treats the dynamics of hybrid vibro‐impact NES (HVI‐NES) attached to a linear primary structure as a passive energy absorber (PES). Due to being a hybridization between the traditional tuned mass damper (TMD) and vibro‐impact NES (VI‐NES), the HVI‐NES exhibits improved energy absorption performance under impulsive excitation in terms of broader energy range. The system parameters are tuned a priori, so for small energies, the HVI‐NES acts like the TMD, and for high energies, it acts as a VI‐NES. Hence, relatively large energy range is covered. This feature, along with the absence of any nonlinear spring and simplicity of the design, makes this system attractive for possible energy harvesting applications. The NES exhibits rich dynamics, consisting of sustained linear oscillations, sustained impacts of various frequencies, and alternating transition between both regimes. The slow flow dynamics of the nonlinear regimes is described analytically using an approximated relation between the HVI‐NES energy and frequency, and with the help of the concept of slow invariant manifold (SIM). The analytical results are supported by numerical verifications. Numerical optimization is applied for increasing values of impulsive excitation energy, and proves improved energy harvesting performances for a broad energy range.

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Vibro‐Impact Dynamics

Cited by 66 publications

References 0 publications

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

Nonlinear dynamics and triboelectric energy harvesting from a three-degree-of-freedom vibro-impact oscillator

The Analysis of Non-Newtonian Vibro-Impact Processes in Tube Constructions and Systems with Parallel Impact Pairs

Dynamics of a hybrid vibro‐impact nonlinear energy sink

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