Influence of cavity partition on the damping performance of additively manufactured particle dampers

Additively manufactured particle dampers (AMPDs) are innovative particle dampers created by intentionally preserving unfused powder within a structure during laser powder bed fusion. One of their distinct advantages is the ease of fabricating structures with multiple cavities. This study focused on exploring the influence of cavity partitioning on the damping capacity of AMPDs at five different frequencies (200, 500, 1000, 1500, and 2000 Hz) and an acceleration range of 50-250 m/s2. Five AMPDs were designed to have similar cavity ratios while differing in cavity size. A complex power experiment and discrete element model simulation analysis were carried out. Notably, a consistently larger clearance between the ceiling of the wall and the powder bed was observed in the AMPDs with larger cavity sizes. Furthermore, dividing a larger cavity of AMPD into several smaller cavities emerged as an effective approach to maintain the damping performance at higher frequencies.