A two-dimensional nonlinear vibration absorber using elliptical impacts and sliding

Wang, Chengen; Brown, Judith; Singh, Aryan; Moore, Kate

doi:10.1016/j.ymssp.2022.110068

Cited by 10 publications

(1 citation statement)

References 33 publications

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“…The amplification of the vibrations is believed to be the result of the interference between the propagated vibrations directly from the vibration source along the ground surface and the scattered vibrations from the boundary of the concrete slab. For vibrations that cannot be suppressed by thick concrete slabs and cement-improved subgrade, especially low-frequency vibrations, appropriate vibration isolators can be taken for high-tech equipment, such as nonlinear vibration absorber (Wang et al, 2023).…”

Section: Resultsmentioning

confidence: 99%

In situ experimental study of vibration reduction using thick concrete slabs with natural and cement-improved subgrade

Xu¹,

Lou²,

Chen³

2023

Journal of Vibration and Control

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Thickening the foundation slab and improving the subgrade soil using geo-techniques are effective measures for controlling unwanted vibrations at high-tech facilities. In this study, the vibration-reduction performance of 1-m-thick concrete slabs with natural and cement-improved subgrades was investigated based on in situ frequency sweep tests. One 1-m-thick concrete slab rested on 1-m-thick compacted sandy gravel backfill atop an undisturbed subgrade was constructed on the north side of the experimental site, and another identical concrete slab rested on 1-m-thick compacted sandy gravel backfill atop a cement-improved subgrade was constructed on the south side. The vibration-reduction effect was evaluated by comparing the free-field ground vibrations and surface vibrations of the two slabs at three pairs of evaluation locations. In terms of peak velocity, the 1-m-thick concrete slab with the natural subgrade exhibited a slight vibration amplification effect at low frequencies and a significant reduction effect at middle and high frequencies; the 1-m-thick concrete slab with the cement-improved subgrade exhibited a continuous vibration reduction action at all frequencies. In terms of RMS velocity, the vibration-reduction performance of the 1-m-thick concrete slab with the cement-improved subgrade was better than that with the natural subgrade. The results demonstrated that the vibration-reduction effect of the thick concrete slab was significant and could be increased by improving the subgrade using the cement grouting method.

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Section: Resultsmentioning

confidence: 99%