The effect of material properties on the radiation of impact sound from cylinders - The stiffness and damping properties of billet materials are shown to affect radiated energy and spectrum from candiate forge-construction materials

A number of studies have investigated engineering methods of reducing forge-hammer noise by means of enclosure, blow reduction and external application of damping materials. Another alternative, in which parts and units are manufactured from metals with high internal damping, has yet to be fully investigated. In a theoretical and experimental study of sound radiation from cylindrical samples, candidate hammer materials are evaluated for potential reduction of radiated energy and energy spectrum. It is shown that the quantity of radiated sound is strongly dependent on the stiffness and damping properties of the candidate tool-steel, forged-iron and cast-iron samples. The rate of attenuation of sound radiation is also shown to be affected in a predictable manner from the (tabulated) properties of the metals