STUDIES ON HAND PROTECTORS FOR PORTABLE VIBRATING TOOLS

The dynamic visco-elastic properties of the porous elastic materials were measured by impressing the compressive vibration and were translated into the electrical equiva-lent circuit through the mechanical one consisting of four elements. The human hand was also simulated to the electrical equivalent circuit. Consequently, by using the simulator, the author examined how the thickness of the porous elastic materials influenced the protection effect.The porous elastic materials in this study were two types of polyvinyl chloride foam (described in the previous paper). From this experiment, it was concluded that the protection effect was proportional to the thickness of the porous elastic material in the frequency range between 30 c/s and 400 c/s.