Optimization of loading grain elevators PTL based ACS with a switched structure

Grain transferring logistics from producer to consumer is its transferring logistics between elevators of different purposes and different holding volumes. Experience shows that three-four elevators are used in this logistics chain. The main and the most energy-consuming process for all these elevators is the process of moving grain using threadtransport lines (TTLs) which takes place during taking over, undermining and discharge. Thereby, the volumes of grain transferred by elevator TTLs by far exceed the production volumes. In Ukraine this is tens of millions of tonns every year. This stipulates the actuality of the task of lowering time and energy consumings for these transfers. Different consecutively connected conveyors for horizontal and vertical (bucket chains) grain transfer are used in TTls. In systems of automatic control (SAC) for TTLs, in the last century and now, only were used functions of conveyors start and stop interlockings, control for incident occurrence and prevention from developing incident to breakdown, in particular, by emergency trips of TTLs. TTL load control function, including its optimization using criterion of maximum productivity and energy-efficiency, taking into accordance its specifics as control object (CO), always was delegated to human-operator as well as responsibility for the results of ineffective control. This complexity is determined by control object’s different specific characteristics. These include: the restriction of ?alarm status? type for mode variables of transferring process; ex ante uncertainty of these restrictions’ values; impossibility of direct measurement of some important mode variables; substantial changes in CO dynamic characteristics in control channel when changing route of transfer; and also, and this is very important on principle, the fact that optimal modes of operation of TTLs are getting close to emergency modes. Obviously, only creation of effective SACs can provide TTLs’ work in these conditions, and they also need to take into account different specifics of CO. Control algorithm of SAC with commutating structure, which take into account abovementioned CO specifics and provide TTLs work with maximum productivity and energy-efficiency with guaranteed exclusion of alarm states trips of equipment of TTLs, is in detail described in this article. Control algorithm was fine-tuned during procedure of simulation modelling. SAC with commutating structure passed field tests at elevator. Dynamics of control processes is examined.