Sistema de Absorción de Vibraciones de amplio Espectro basado en un nuevo Muelle de Rigidez variable

This paper presents an adaptive tuned vibration absorber. The vibrations are absorbed by a secondary mass that is attached to the system through a new adjustable-stiffness spring, which consists of two pairs of leaf springs working in opposition. Its wide range of stiffness values (between 1 kN m/s and 16 kN m/s) allows the absorber to cancel vibration in the range 1.43-5.73 Hz. A DC motor allows the spring to adjust its stiffness such that the vibration attenuation is maximum for any frequency in the mentioned interval. The vibration absorber has been included in a test bench modelling a second order system, and a set of experiments have been conducted that show a good agreement to the theoretical results for low magnitude excitations. However, as the excitation magnitude increases, the deviation from the linear behaviour impedes applying scalability and addition.