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Overview

This example considers a tower crane system modelled with Flexcom. The crane is 25m high with a maximum lift height of about 19m. It lifts a 10ton block from the ground up to an elevation of 14m. A 32mm wire rope is used, designed to support a safe working load of almost 12tons. The pulley diameters are set equal to 40 times the cable diameter.

The tower is equipped with 3 pulleys on the hoist, two at the end of the jib, and one at the lower end of the hoist close to the hook/weight. Another pulley close to the tower facilitates the lifting process. The cable is reeled onto the tower pulley at a constant rate of 0.1m/s.

The main model shown below contains 3-pulleys on the hoist, but 1- and 2-pulley versions are also provided. These models illustrate the mechanical advantage of including more pulleys into the system.