Dynamic performance of a novel tuned vibration absorber with nonlinear friction interfaces

A novel tuned vibration absorber with frictional interfaces (FTVA) is proposed in this study, combining the benefits of a tuned absorber and nonlinear dry friction damping to dissipate energy. Firstly, the mechanism of the nonlinear dry friction damper is revealed using a simplified model with a one-degree-of-freedom tuned mass absorber and a hysteresis friction contact element. Then, a practical configuration for the FTVA is proposed, employing a metal strip to tune the absorber and incorporating frictional interfaces with adjustable normal loads. Numerical simulations and experimental investigations have been conducted, demonstrating the effectiveness of the innovative FTVA design. When the absorber is well-tuned and the frictional interfaces are properly designed, a significant reduction in vibration amplitude can be achieved, along with an expanded frequency range where vibration amplitudes are constrained. The nonlinear contact element plays a crucial role in mitigating the occurrence of additional peak vibrations, as the friction damping is activated once the system response surpasses a certain threshold. Furthermore, the effects of contact parameters, such as the normal load of the interface and the forcing level, have been extensively examined, highlighting its potential to suppress vibrations in engineering.