The segregation phenomena may exist in a granular bed with a binary mi
xture due to the external vibrated excitation. This paper studies one
larger particle rising from the bottom of a vibrated granular bed fill
ed with smaller particles. The rising velocity of the larger particle
is experimentally measured. The influences of the vibrational amplitud
e, the vibrational acceleration and the Vibrational frequency on the s
egregation process are analyzed.