Tuning of vibro-impact nonlinear energy sinks under changing structural parameters. Part 2. Comparison with tuned mass dampers
DOI:
https://doi.org/10.32347/2410-2547.2025.115.13-32Keywords:
nonlinear energy sink, tuned mass damper, vibro-impact, primary structure, efficiency, comparisonAbstract
This paper studies the dynamics and efficiency in mitigating the primary structure (PS) vibrations with using the single-sided vibro-impact nonlinear energy sink (SSVI NES) and tuned mass damper (TMD). It is considered the PS coupled with vibro-impact and linear dampers with mass ratio of 2% and 6% under periodic excitation with change in structural parameters such as the PS damping, its stiffness, and exciting force intencity. The paper focuses on the ability of these dampers to maintain their tuning. The numerous numerical experiments, which results are reflected in expressive graphs and tables, convincingly show that both the SSVI NES and the TMD retain their tuning and demonstrate high efficiency in mitigating the PS vibrations across fairly wide ranges of these parameters. The TMD retains tuning no worse than SSVI NES, and in some cases even better. At the same time, SSVI NES, which always exhibits complex dynamics, provides narrow zones of bilateral damper impacts on the PS directly and on the obstacle located near the resonance. Thelighter SSVI NESsexhibit a specialbehavior. Their high efficiency is ensured by non-standard unusual values of large clearance and small dampingcoefficient. Furthermore, selecting the optimal SSVI NES design difficult because there are many sets of optimal parameters that provide their similar performance.
The energy approach is used to estimate the mitigation of PS vibrations, that is, the reduction of maximum mechanical energy of the PS is considered as criterion of mitigation. The energy of dampers, which is taken away from the PS energy, is shown. The zones of nonlinearity for SSVI NES include the zones of bilateral and unilateral damper impacts on the PS and obstacle; these zones also are shown. The characterisitics of irregular motion of SSVI NES are also shown.
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