Abstract
Disk shaped tools like circular saw blades and cut off grinding wheels have low axial stiffness, can easily be excited by dynamic bending forces or displacements and are powerful radiation sources of air borne noise. Damping is a practical mean to reduce sound levels. Two different dissipative systems have been introduced: sandwich systems with metal-polymere-metal layers and metal-to-metal systems. The high damping effect of the 3-layer-disks follows from the deformation energy of the polymere material. It could be proved that in metal-to-metal systems the fluid damping of the gas enclosed between the two parts is dominant. Apart from the damping mechanism there is an upper bound for the loss factor which is given by radiation of the near field. For the investigated wheels this limit was of the order of 0.01 above which no marked noise reduction can be achieved.
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