A lightweight tuned particle damper for low-frequency vibration attenuation

A novel lightweight variable-stiffness tuned particle damper (TPD) is designed to efficiently control low-frequency vibrations across a wide frequency range in manipulators, combining particle damping technology with dynamic vibration absorber principles. This study aims to integrate both theoretical and experimental approaches to comprehensively investigate the TPD's variable stiffness, damping characteristics, and vibration attenuation efficacy. Methodologically, the research entails designing and analyzing the TPD's variable stiffness mechanism, establishing a coupled dynamic model between the TPD and the manipulator, fabricating a prototype TPD, and subsequently evaluating its frequency variability range and vibration control effectiveness. Additionally, the study explores the semi-active control capabilities of the TPD. Results demonstrate that the designed TPD, utilizing a single 100 g particle, achieves a substantial 60 % reduction in manipulator amplitudes within the 5-10 Hz frequency range. Moreover, the study identifies the TPD's operational acceleration threshold to be 0.6 g, thereby broadening its applicability across various scenarios. Furthermore, the integration of semi-active control algorithms augments the absorption frequency band. These findings highlight that the TPD offers multi-parameter adjustability in stiffness, damping, and mass, with a lighter mass compared to traditional dynamic vibration absorbers. It can effectively mitigate vibrations without altering the original system's dynamic characteristics, presenting a promising solution for engineering applications necessitating versatile and efficient vibration control mechanisms.