Bibliographic Details
| Title: |
RAM measure of hydraulic powered roof supports in underground longwall coal mines. |
| Alternate Title: |
RAM analiza hidrauličkih samohodnih sustava podgrade u podzemnim ugljenokopima sa širokočelnim otkopavanjem. |
| Authors: |
Rahimdel, Mohammad Javad1 rahimdel@birjand.ac.ir |
| Source: |
Rudarsko-Geološko-Naftni Zbornik. 2026, Vol. 41 Issue 3, p219-231. 13p. |
| Subject Terms: |
*Reliability in engineering, *Maintainability (Engineering), *Mean time between failure, *Plant maintenance, *Systems availability, *Longwall mining |
| Abstract (English): |
Mining operations in underground coal mines, particularly those using the longwall method, require continuous progress and the avoidance of interruptions, as any stoppage can lead to roof collapse. Given the mechanization of coal mining and the underground extraction of this mineral, the use of powered supports is essential to prevent roof collapse. To maintain continuity in mining operations, increase production, and simultaneously control and reduce costs caused by downtime and failures of roof support systems, it is necessary to assess their reliability. This paper aims to analyze the reliability, maintainability, and availability (RAM) of powered support equipment. To achieve this, the hydraulic powered support system was selected for data collection and analysis. The results indicate that the time between failures (TBF) and time to repair (TTR) data of the subsystems followed a renewal process, except for the TBF data of the hydraulic subsystem, which followed a non-homogeneous Poisson process (NHPP). The reliability of the subsystems decreased to 85% after 25 hours. The maintainability analysis showed that most failures of the powered roof supports are repaired within 1 hour. Furthermore, the powered support systems operate under desirable conditions with 99.58% availability. However, in order to create an efficient and easy-to-manage maintenance schedule, it was suggested that preventive maintenance activities be performed at the end of each working day. [ABSTRACT FROM AUTHOR] |
| Abstract (Bosnian): |
Rudarske aktivnosti u podzemnim ugljenokopima, osobito pri primjeni metode širokočelnoga otkopavanja, zahtijevaju neprekidno odvijanje proizvodnoga procesa i izbjegavanje zastoja jer svako neplanirano zaustavljanje može dovesti do gubitka stabilnosti i urušavanja krovine. S obzirom na visoku razinu mehanizacije u podzemnoj eksploataciji ugljena primjena hidrauličkih samohodnih sustava podgrade predstavlja osnovnu sigurnosnu mjeru za osiguranje stabilnosti radnoga prostora. Kako bi se osigurala kontinuirana proizvodnja, povećala učinkovitost rada te istodobno smanjili troškovi uzrokovani zastojima i kvarovima opreme, nužno je provesti sustavnu procjenu pouzdanosti, održivosti i dostupnosti (RAM) sustava podgrade. Cilj ovoga rada jest provedba RAM analize hidrauličkih samohodnih sustava podgrade u stvarnim radnim uvjetima. U tu svrhu analiziran je hidraulički sustav samohodne podgrade kao tehnički sustav sastavljen od više funkcionalnih podsustava. Rezultati pokazuju da podatci o vremenu između kvara (TBF) i vremenu popravka (TTR) većine podsustava slijede obnovljivi (renewal) proces, dok podatci o TBF-u hidrauličkoga podsustava slijede nehomogeni Poissonov proces (NHPP). Pouzdanost analiziranih podsustava smanjila se na približno 85 % nakon 25 sati rada. Analiza održivosti pokazala je da se većina kvarova hidrauličke samohodne podgrade otklanja unutar jednoga sata. Nadalje, izračunana dostupnost sustava iznosi 99,58 %, što upućuje na vrlo povoljne radne uvjete. Ipak, radi uspostave učinkovitoga, normativno utemeljenoga i operativno jednostavnoga plana održavanja preporučuje se provođenje preventivnoga održavanja na kraju svakoga radnog dana. [ABSTRACT FROM AUTHOR] |
| Database: |
Energy & Power Source |
