Monday  |  Salon 12  |  04:40 PM–05:00 PM

#18635–Experimental Investigation of the Damping Effect of Inherent Particle Damping Under Centrifugal Load

The passive damping mechanism of particle damping is capable of influencing the structural dynamic behavior of mechanical structures in terms of vibration mitigation. Especially additive manufacturing technologies offer a huge potential to integrate powder-filled cavities into structures and thus enable this inherent damping effect. The potential was already shown for additively manufactured beams but also for final products like gears. However, for rotating components such as gears, the centrifugal load may affect the damping mechanism adversely as relative motion of particles could be reduced. In this experimental study, we investigate particle damping in structural dynamics under rotation. For this purpose, we compare the damping behavior of additively manufactured gears with and without inherent particle damping under centrifugal load. For varying rotational speeds the vibration response is measured using a laser vibrometer that rotates synchronously with the gear. An automatic impulse hammer ensures identical excitation in each measurement while the applied force is also monitored. Gears with particle damping show a significant increase in damping. An essential dependency on centrifugal load is shown here. Our findings contribute to the basic understanding of particle dynamics under centrifugal load and opens new paths to exploit particle damping in rotating structures.

Mirco Jonkeren   Leibniz University Hannover
Sebastian Tatzko   Leibniz University Hannover