Abstract
This paper introduces a vibration alert interface (VAI) that provides information through various vibration patterns. In our previous studies, we designed the VAI and its vibration patterns to provide analog-like information to users. Precise cognition requires correct perception of velocity information. In this paper, we propose a vibration perceptual model for users to recognize relative velocity to obstacles. Above all, the author explains the main function and working principle of Vibration Alert Interface. After, the author supposes mathematical models to describe relationship between vibrotactile perception and interval period. Then author conducts experiments and verify those assumptions and discover more property of effective elements of interval period.
