Seismic mitigation performance of combined stiffness nonlinear energy sink

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (9) : 203-213.

EARTHQUAKE SCIENCE AND STRUCTURE SEISMIC RESILIENCE

Seismic mitigation performance of combined stiffness nonlinear energy sink

WU Mengnan1, NING Xizhan*1,2, ZHANG Hongfu3

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Abstract

To address the issue that conventional Nonlinear Energy Sink (NES) has difficulty in triggering targeted energy transfer at low energy input, a combined stiffness NES is proposed by introducing a low-order nonlinear stiffness term into the cubic stiffness NES to improve its seismic mitigation performance robustness. An optimization strategy considering different energy input levels is proposed, and the genetic algorithm is used to optimize the parameters of the combined stiffness NES, cubic stiffness NES, and TMD. The seismic mitigation performances of different dampers are compared and analyzed. The results show that the seismic mitigation performance of the combined stiffness NES is comprehensively superior to that of the cubic stiffness NES, and its robustness to energy input is similar to TMD, while its robustness to the frequency change of the main structure is better. By analyzing the power spectrum of the seismic response with the numerical wavelet transform, it is revealed that the combined stiffness NES can generate a strong instantaneous internal resonance capture behavior with the main structure in a wider frequency band, indicating that it has extremely strong frequency robustness. The analysis of the transfer of energy between different parts in the controlled system shows that the high-order nonlinear stiffness only transfers the energy of the main structure at high energy input, while the low-order nonlinear stiffness can still effectively transfer the energy of the main structure at low energy input, revealing that the combined stiffness NES has good energy input robustness.

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nonlinear energy sink / combined stiffness / seismic mitigation performance / robustness

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WU Mengnan1, NING Xizhan1, 2, ZHANG Hongfu3. Seismic mitigation performance of combined stiffness nonlinear energy sink[J]. Journal of Vibration and Shock, 2025, 44(9): 203-213

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