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Time-dependent seismic hazard in Bobrek coal mine, Poland, assuming different magnitude distribution estimations

Leptokaropoulos K., Staszek M., Cielesta Sz., Urban P., Olszewska D., Lizurek G.

Acta Geophysica

2017

Vol. 65, no. 3

493--505

The purpose of this study is to evaluate seismic hazard parameters in connection with the evolution of mining operations and seismic activity. The time-dependent hazard parameters to be estimated are activity rate, Gutenberg–Richter b-value, mean return period and exceedance probability of a prescribed magnitude for selected time windows related with the advance of the mining front. Four magnitude distribution estimation methods are applied and the results obtained from each one are compared with each other. Those approaches are maximum likelihood using the unbounded and upper bounded Gutenberg–Richter law and the non-parametric unbounded and non-parametric upper-bounded kernel estimation of magnitude distribution. The method is applied for seismicity occurred in the longwall mining of panel 3 in coal seam 503 in Bobrek colliery in Upper Silesia Coal Basin, Poland, during 2009–2010. Applications are performed in the recently established Web-Platform for Anthropogenic Seismicity Research, available at https://tcs.ah-epos.eu/

Failure frequency of candies packing line before and after introducing service strategy of Total Productive Maintenance (TPM)

Nosal S., Staszek M.

Journal of Research and Applications in Agricultural Engineering

2015

Vol. 60, nr 2

68--71

The candies packing line includes the following devices: candies stacking machine, packing machine, X-Ray controller, ma-chine grouping candies and packing them into boxes (boxformer), box wrapping machine, board machine and pallets wrap-ping machine. The line works 504 hours a month. During 2003-2007 the line was serviced according to the strategy of after-damage repairs and during 2008-2012 according to the TPM strategy. The introduction of TPM contributed to the de-crease of the line failure frequency by 50%, the standstill time by 60% and the increase of productivity by ab. 10%.

Linię pakowania cukierków tworzą następujące urządzenia: układarka cukierków, maszyna pakująca, kontroler X-Ray, maszyna grupująca i pakująca cukierki w tzw. boksy (boxformer), owijarka boksów, kartoniarka i owijarka palet. W ciągu miesiąca linia pracuje 504 godziny. W latach 2003-2007 linia była użytkowana według strategii napraw poawaryjnych, a w latach 2008-2012 według strategii TPM. Wprowadzenie TPM przyczyniło się do spadku liczby awarii linii o 50%, skrócenia czasu postoju o 60% i wzrostu wydajności o ok. 10%.