Optimum control of motor transportation in a quarry with stringent requirements for ore blending

Conclusions

• 1. Optimum conditions of ore blending impose the following requirements on the technology of intra-quarry blending: a) the existence of a schedule with fixed intervals of arrival of trucks at the discharging point, maintaining, during a given blending period, given proportions between the amounts of ore extracted from the faces with various ore contents; b) no permitted deviation of the mean ore content from the given value, ε=0; c) the basic content of the ore is given by$a_0 = \frac{{\sum\limits_{i = 1}^n {\frac{{a_l }}{{b_i }}} }}{{\sum\limits_{i = 1}^n {\frac{1}{{b_l }}} }}.$

• 2. Owing to a number of factors, in quarry conditions it is difficult to realize completely the conditions of optimal control of blending, but if the motor transportation is operatively controlled on an individual system it is possible to approximate these conditions. When applied to a particular case, the above control criterion—the average dispersion of the component content in a blending period—enables use to make a comparative analysis of the blending qualities of ore corresponding to various algorithms of control by quarry motor transport, with the aim of selecting the best algorithm. A small deviation from the given requirements does not lead to a large deviation of the ore blending quality from its optimum value.