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The volumes of the sea freight traffic in spite of crisis phenomena in the world economics continue their growth. First of all, it concerns cools for power engineering and big shipping containers. Between the main regions of economics development, the considerable cargo traffic is established. In such conditions when the full charging of ships of any freight capacity can be guaranteed, economics requirements force to put in exploitation the more and more big ships. Now gigantic ships are capable of carrying 200 000 t of bulk cargo and 16 000 standard containers (TEU) become a dominant type of ships in the structure of the world merchant fleet. In cargo handling of such ships, the berth reloaders with traditional construction scheme are used. The reloading comprises a high portal with fixed to it cantilever horizontal beam along which a trolley with cargo (a grab or a container) suspended to it with help of wire ropes travels. Geometrical parameters of the reloader are set in dependence of ship dimensions. To minimize expenses connected with demurrage of ship user loading operation, the manufacturers, for instance, grab encoder the designers are trying to increase till 2000 t/h by increasing nominal velocities of the trolley of a modern reloader may be equal to 300 m/s with acceleration equal to 1,4 m/s 2 . With such parameters, the time of working cycle can be shortened to 45s. The work of such reloader operators is very stressed. This includes making many mistakes such as not optimal combination of working movements, ineffective dampening of cargo oscillations etc. The quantity of such mistakes are increasing due to fatigue of crane driver and lead to decline of his average productivity almost by 20 %. The driver working on the limit of his possibilities become, as it is said, “physiological barrier” on the way to increasing the crane productivity. One of the means to surmount that barrier is automation of reloading machines which permits to essentially improve and “humanize” conditions of operator works and optimize working regime of machine and provide its work with constant high productivity independently from qualification of a driver, state of his health and other conditions. 1

THE METHODS OF CALCULATION OF THE TIME OPTIMAL CONTROL OF LIGHT BRIDGE CRANES AT TRANSFERENCE OF LOAD ON FLEXIBLE ROPE SUSPENSION WITH VARYING LENGTHS