離散要素法による金属積層造形粉体ダンパの減衰メカニズムと性能の解明

抄録

Additively manufactured particle dampers (AMPDs) are novel damping devices formed by intentionally preserving unfused powder within a structure during laser powder bed fusion (LPBF) manufacturing process. Despite their innovative design, the damping mechanism and effectiveness of AMPDs remain uncertain due to the absence of the corresponding numerical analysis. This study focused on exploring the damping mechanism and performance of AMPDs experimentally and numerically. Several AMPDs with the same cavity ratio but different cavity distributions were fabricated using LPBF with 316L stainless steel powder. Complex power experiments were conducted at a vibration frequency of 200 Hz and an acceleration range of 50–250 m/s². Subsequently, a discrete element model (DEM) with a reasonable number of particles and simulation parameters was proposed and cross-verified with experimental results. Notably, the damping mechanism of AMPD was revealed through numerical analysis. Furthermore, the influence of cavity size on the damping performance of AMPD was discussed through both experimental and simulation methods.