Study on Vibration Reduction Characteristics of Cantilever Beam Based on Particle Damper of Obstacle Network

The particle damper of obstacle network is a vibration damping device with a three-dimensional network built into the particle damper. The energy dissipation characteristics of the particle damper can be changed by increasing the collision and friction between the particle and the network. In order to study the vibration attenuation characteristics of the cantilever beam with the particle damper of obstacle network, the vibration characteristics of the cantilever beam with the particle damper of obstacle network attached at the frequency range of 20-800 Hz were experimentally studied under the condition of 90% filling ratio with 2 mm particle size.Secondly, the loss factors of particle dampers and particle dampers of obstacle network in specific frequency band（20～800 Hz） and specific vibration acceleration band（1-10g） are measured. Finally, the influence of the three-dimensional network on the energy loss and particle motion of the particle damper attached to the cantilever beam was investigated by discrete element simulation. The results show that the three-dimensional network has different effects on different vibration conditions. For the cantilever beam, the damping effect at the first order formant（20 Hz） is poor, but the damping effect at the second order formant（185 Hz） and the third order formant（520 Hz） is obviously better than the particle damper. The reason is that the motion amplitude of particles is large in the low frequency band, and the obstacle network will hinder the movement of particles, leading to the reduction of energy dissipation.However, the agglomeration effect of particles broken by the obstacle network in the middle frequency band enables more particles to participate in the energy dissipation process, which effectively improves the damping performance of the particle damper.