Mathematical modelling for a class of flexible robot with two links an
d three joints is considered in this paper. Assume that one of the two
links is elastic and that the deformation of the elastic link happens
along any direction perpendicular to the longitudinal axis of the ela
stic link. Using the dynamics and Hamilton's variational principle, we
deduce that the transverse displacement (deformation) of the elastic
link and the revolved angles should satisfy a system that is composed
of two elastic partial differential equations of order four and three
nonlinear integrodifferential equations.