Dynamics analysis of underactuated Cherrypicker systems with friction

Abstract

The cherrypicker system has long mechanical arms and an unactuated bucket, which helps raise up workers to implement difficult aerial works on high up towers, power lines, and buildings. However, due to the gravity and inertia, the bucket has residual vibration which brings safety concerns. In order to design controllers to suppress the oscillation, this paper first provides a dynamic model of a two-armed cherrypicker system with friction by using Lagrange’s modeling method and also derives the matrix form dynamic equation. Numerical simulation results verify the feasibility of the model.