THE RELATIVE EVALUATION METHOD OF UNEVENNESS OF FLOORS FROM A VIEWPOINT OF TROUBLE TO HUMAN CAUSED BY VIBRATION ON CASTERS : Study on relative evaluation method of unevenness of floors from a viewpoint of vibration on casters (Part 2)

The purpose of this study is to present the relative evaluation method of unevenness of floors from a viewpoint of trouble to human caused by vibration on casters. First, we carried out sensory tests to make evaluation scales of vibration on casters such as wheelchair and stretcher. Next, we developed the specialized caster. This caster could detect the acceleration on casters caused by unevenness of floors, corresponded to evaluation scales. Finally, we presented the relative evaluation method of unevenness of floors, dealing with maximum amplitude of acceleration detected by the specialized caster.