SYLOK

SYLOK (System localization) - one of the modules of the dispatcher system MSD-80. SYLOK was established in the Department of Dispatching Systems ZB-7 (formerly BS-3 Control Systems Department) EMAG Center for Scientific and Manufacturing of Electrical Engineering and Mining Automatics in Katowice in the early 1980's. The hardware of the system was a PRS-4 minicomputer equipped with a dedicated industrial channel, which enabled the acquisition of analog signals from sources in the underground mines of seismometers. The prototype system was installed in the SZOMBIERKI mine in February 1983. The positive results of the experimental operation resulted in the installation of the SYLOK system in 16 Polish rock-buried mines. In the mid 80's of the 20th century, 5 SYLOK systems were sold to China and a license for its manufacture (similar to the SAK system). This was the only case in Poland to sell computer system licenses. At the beginning of the 1990s, SYLOK was replaced by the next generation of devices called ARAMIS, but in many mines SYLOK is used up to now. Destiny

SYLOK was designed to automatically determine the epicenter and shock energy immediately after its occurrence. The time difference between the arrival of the same seismic wave P and the position of the seismometers was used to determine the epicenter. Based on the time differences, the position of the seismometers and the speed of propagation of the seismic wave P, a shock epicenter was located, and the energy of the shock was determined based on the duration of the signals and their amplitudes. Data provided by the SYLOK system (temporal-spatial distribution and seismic real-time energy), together with data from the SAK system (time-space distribution, contract energy and seismic activity) and the results of intermittent drilling allowed the assessment of the actual rock bath situation. This enabled efficient bathing prevention (relaxation, irrigation, employment reduction in vulnerable areas, reinforcement of the casing) leading to improved crew safety. Principle of operation

Seismometers (SPI-80 or SM-3 type) processed seismic waves into analogue electrical signals that were sent to the surface of the mine by means of natural, current transmission on symmetrical lines. They were processed by a multi-channel analog-to-digital converter and stored in a FIFO buffer located in the PRS-4 minicomputer. At the same time a special algorithm searches in all channels estimated start of the wave P. The detection of the approximate beginning of the waveform caused latching buffer such that memorizing the course of the period of 1.5 seconds as determined prior to the beginning. Snatching of the buffer triggered an algorithm that accurately determines the beginning of the wave in all channels and calculates the time differences to determine the epicenter of the shock. Based on the duration and amplitude of the recorded signals, the energy of the shock was calculated. Information about the epicenter and shock energy displayed on the screen of the monitor is supplemented by waveforms in all channels with the first inputs indicated. The staff of the bath station could correct the automatically generated waves and recalculate the epicenter's parameters. This was particularly important for locating the epicenter of low-energy or distant shocks. Bibliography

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