Experimental, theoretical, and numerical modal analysis of a damped portable-grinder disk

This paper deals with a theoretical and experimental investigation into the vibration of portable grinder disks. Our research objective is to determine the elasto-dynamic properties for a new type of damped disk and evaluate their behavior in terms of reduction in noise emission levels. The disk vibration has been studied from a variety of standpoints. A comparison between the vibration modes obtained from theory and experimental data allows us to estimate the constitutive parameters of these new disks. In addition, our study includes a numerical analysis that takes into account the effects of the disk rotation. Theoretical modes show good agreement with experimental data. They both confirm a reduction in the high frequency modes exhibited by the damped disk when compared to the undamped disk. The finite element analysis allows prediction for the shift in natural frequencies produced by the centrifugal force field acting on the disk surface.