自己同期現象を利用した電動ハンマの最適設計に関する検討

抄録

The symptoms of a hand-arm vibration syndrome characterized by Raynaud's disease are caused by long-term use of hand-held vibrating tools, and by excessive exposure to hand-arm vibrations. The purpose of this research is to develop a hand-held vibrating tool using self-synchronization phenomena in order to solve the problem of the hand-arm vibration syndrome. We focus on the development of a vibration mechanism for an electric hammer used to crush concrete, rock ground and asphalt. In the previous report, an elementary models, the impact model with one oscillator and that with two oscillators, suitable for an electric hammer were proposed and it was analytically and experimentally confirmed that the synchronized solutions in two oscillator model are able to achieve a good balance between vibration control and excitation. In this report, we suggest a hand-held new two oscillator model aiming at practical use with the knowledge that we got from previous two oscillator model and perform a study on optimal design of new one by numerical computation.