Abstract
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 the self-synchronization phenomena in order to drastically resolve the problem of the hand-arm vibration syndrome. We focus on developing the vibration mechanism for a tamping rammer used to compact cohesive soils and asphalt. The prototype of the generation mechanism of synchronous vibration suitable for a tamping rammer is developed based on the mechanism of the impact model with four oscillators, which has been developed in the previous reports. This model consists of an upper block and two lower blocks coupled each other by coil-springs, and the two rotor-type oscillators are mounted on each of the lower blocks. In this report, the availability of the synchronous vibration generated in the present model is investigated experimentally and analytically. The results confirm the practical applicability of the experimental apparatus.
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