Browsing by Subject "optimal drilling"

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Access status: Open Access ,
Optimization of rock disintegration based on acoustic background of drilling machine
(Wydawnictwa AGH, 2007) Kostúr, Karol; Futó, Jozef
The rotary drilling of rock is widespread technology in mining and in tunnelling. The paper describes the results of research by aim to find relationships between optimal drilling and sound signal of drilling machine. The optimisation criterion has been formulated as the minimisation of specific energy with maximal effective speed of drilling in process of the rock disintegration. The research in this field has been made on experimental drilling stand. Our monitoring system has measured following variables: pressing force of core drill, revolutions of drilling head, length of drilling, time, power, acoustic signals. For measurement of acoustic signals have been used very sensitively sound meter Mediator 2238. From this measurement have been processed acoustic spectrums. Then we are found relationships between optimal control of drilling and composition of acoustic spectrum. On base of experimental results, we can formulate the optimal control following: «To achieve the minimum difference between the equivalent sound level at the load and idle modes only at the representative frequency. The representative frequency dependences on type of the rock». New method based on these relationships enables the optimal control of drilling machine by using measured acoustic signals only.