Abstract
This paper deals with a vibrationless forge hammer using an active control method for suppressing impact vibration. It is the purpose of this paper to introduce the prototype of the vibrationless forge hammer, Mel Forge, developed recently at MEL. First, this paper shows the fundamental structure of Mel Forge produced by using a 1/40 ton air hammer. Then, from the viewpoint of a feedforward control method, the design of the Mel Forge system is performed. Based upon the control method, impact experiment is carried out, demonstrating the capability of eliminating the impact vibration. Next, with a view to reducing the noise level induced by the operation of an active isolator, a mechanism of the generation of the noise is clarified with the aid of a feedfroward control chart. Finally, applying the modified feedforward element to the Mel Forge system, the reduction of both the impact vibration and the noise radiation is obtained.
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