Experimental modal analysis of optimized additively manufactured robotic arms coated with ceramic powders and resin

This study investigates the vibration damping properties of additively manufactured robotic arm components enhanced with optimized infill patterns and resin coatings doped with alumina and silicon carbide. Seven designs, including Voronoi, triangular, and square honeycomb structures at 1 and 2 mm scales, were tested. Modal analysis was performed to evaluate natural frequencies, damping ratios, and damping coefficients. Sample E demonstrated superior damping performance, with the highest damping coefficient (3.2 Ns/m) and ratio (0.18). Sample A represents the unoptimized solid baseline part, while Sample E corresponds to the 2 mm triangular honeycomb design. In contrast, Sample A exhibited the lowest values, indicating inferior vibration control. The Voronoi patterns showed the most significant weight increase post-coating due to their surface area, while triangular honeycomb designs balanced weight and damping performance. These findings highlight the effectiveness of combining advanced materials and designs to enhance robotic arm stability, precision, and longevity. The study provides valuable insights for optimizing robotic components for industrial applications requiring high performance and reliability.