Abstract
A ladder of the ladder truck with lift mechanism often generates a lot of vibrations at the time of the lift operation. The lift operation includes the extending and retracting motions, the ascending and descending motions, and the turning motion. In this paper, the simulation analysis of the dynamic behavior for the multi-sections ladder which can extend, retract and turn is described. We make the dynamic analytical model of the multi-sections flexible ladder using multibody dynamics. A coupled equation of motion of the multi-sections flexible ladder is derived using the differential algebraic equation (DAE).