Abstract
A vibration suppression device is presented for a grass cutting machine driven by an engine. Since the machine is portable, it should be light and compact, in addition, engine vibrations and their transmissibility to the human body should be small. It is difficult to suppress both engine vibrations and its transmissibility to the body simultaneously by using usual vibration control technique. By suppressing both, this article applies an anti-resonance control. In order to create the anti-resonance, a new type variable spring magnetic vibration absorber is developed, and its control method is presented. Since the important frequency region of the machine is in the second mode, a new control technique is presented for suppressing second modal vibrations using the absorber. Theoretical analysis is given, and experimental check is also performed to validate it.
