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A mathematical model of the tower crane’s slew is developed under the condition of constant velocity of the trolley motion along the boom. The model is derived from the second-order Lagrange equations, calculates the tangential and radial load oscillations on a flexible suspension. An analysis of the system motion with the trolley movement to and from the tower has been conducted. A set of estimated figures has been proposed, which made it possible to establish the level of dynamic and energy load of the crane slewing mechanism, as well as to analyze the evolution of the load oscillations on a flexible suspension.

Analysis of the start-up process of the tower crane slewing mechanism with a steady state motion mode of its load trolley