3-D vibration isolation platform based on air springs with additional air chambers and anti-tilt devices in shaking table control room

SHI Yundong1,2,3, XUE Shuangbing2, WANG Qi2, LIU Mingjie1,2,3, WU Hao1,2,3, HAN Qinghua1,2,3

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 35-44.

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PDF(3786 KB)
Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (13) : 35-44.

3-D vibration isolation platform based on air springs with additional air chambers and anti-tilt devices in shaking table control room

  • SHI Yundong1,2,3, XUE Shuangbing2, WANG Qi2, LIU Mingjie1,2,3, WU Hao1,2,3, HAN Qinghua1,2,3
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Abstract

The operation of large shaking tables leads to non-negligible vibration problems to surrounding environment, affecting the use of precision equipment and comfort of staff. To mitigate the vibration of the control room of the National Facility for Earthquake Engineering Simulation (NFEES), a large-mass 3D pneumatic vibration isolation platform was proposed using air chambers and overturning constraint device. Experiments and simulations were carried out and formulas to calculate the overturning constraint stiffness of the overturning constraint device were proposed. The results showed that the isolation period of the air springs with additional air chamber can reach about 1 s with 23% damping ratio. The overturning constraint device can effectively control the overturning of the platform caused by eccentric load of moving staff on the platform, and the overturning angle was reduced by 66% in the test. The designed isolation platform for NFEES can effectively reduce the vibration during the shaking table test with the isolation efficiency higher than 86%.

Key words

Shaking table vibration / Three-dimensional vibration isolation / Air spring / Overturning constraint device / Variable load

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SHI Yundong1,2,3, XUE Shuangbing2, WANG Qi2, LIU Mingjie1,2,3, WU Hao1,2,3, HAN Qinghua1,2,3. 3-D vibration isolation platform based on air springs with additional air chambers and anti-tilt devices in shaking table control room[J]. Journal of Vibration and Shock, 2024, 43(13): 35-44

References

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