Applied Mathematics and Mechanics (English Edition) ›› 2025, Vol. 46 ›› Issue (5): 965-988.doi: https://doi.org/10.1007/s10483-025-3248-7

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Structural vibration control using nonlinear damping amplifier friction vibration absorbers

S. CHOWDHURY(), S. ADHIKARI   

  1. Glasgow Computational Engineering Center, James Watt School of Engineering, The University of Glasgow, Glasgow G12 8QQ, United Kingdom

Abstract:

This paper introduces damping amplifier friction vibration absorbers (DAFVAs), compound damping amplifier friction vibration absorbers (CDAFVAs), nested damping amplifier friction vibration absorbers (NDAFVAs), and levered damping amplifier friction vibration absorbers (LDAFVAs) for controlling the structural vibrations and addressing the limitations of conventional tuned mass dampers (TMDs) and friction-tuned mass dampers (FTMDs). The closed-form analytical solution for the optimized design parameters is obtained using the H2 and H optimization approaches. The efficiency of the recently established closed-form equations for the optimal design parameters is confirmed by the analytical examination. The closed form formulas for the dynamic responses of the main structure and the vibration absorbers are derived using the transfer matrix formulations. The foundation is provided by the harmonic and random-white noise excitations. Moreover, the effectiveness of the innovative dampers has been validated through numerical analysis. The optimal DAFVAs, CDAFVAs, NDAFVAs, and LDAFVAs exhibit at least 30% lower vibration reduction capacity compared with the optimal TMD. To demonstrate the effectiveness of the damping amplification mechanism, the novel absorbers are compared with a conventional FTMD. The results show that the optimized novel absorbers achieve at least 91% greater vibration reduction than the FTMD. These results show how the suggested designs might strengthen the structure's resilience to dynamic loads.

Key words: damping amplifier friction vibration absorber (DAFVA), compound damping amplifier friction vibration absorber (CDAFVA), nested damping amplifier friction vibration absorber (NDAFVA), levered damping amplifier friction vibration absorber (LDAFVA), H2 and H optimization approaches

2010 MSC Number: 

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