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Modellering av rotationssystem
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Management and Engineering, Fluid and Mechatronic Systems. Linköping University, The Institute of Technology.
2014 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This master thesis was conducted during the spring of 2014 at Atlas Copco Rock Drills AB in Örebro. The purpose of the thesis was to develop a simulation model of the rotation system for a hydraulic rock drill. In the future, the model will be used to investigate the phenomena called “jerky rotation”. In order to validate the simulation model a test bench was designed and tests were made. The main focus was to model the gerotor motor that is used to propel the rotation of the drill string. The model shows the pressure and flow variations that occur due to the geometry of the motor. Simple models of the rock and drill steel were developed to simulate the entire rock drill. Those models were also validated with test results. The results from the model of the motor are considered to be good enough to be used for future simulations of the rotation of the rock drill. However, in order to see the cause of “jerky rotation”, a better model of the hydraulic supply system for the gerotor is needed. A better model of the rock might also be needed.

Abstract [sv]

Detta examensarbete genomfördes under våren 2014 på Atlas Copco Rock Drills AB i Örebro. Syftet var att ta fram en simuleringsmodell av rotationssystemet för en hydraulisk bergborrmaskin. Modellen ska i framtiden användas för att undersöka fenomenet ”jerky rotation”. Under arbetet konstruerades en provbänk och mätningar gjordes för att validera simuleringsmodellen. Tyngden i arbetet lades på att göra en modell av den gerotormotor som används för att driva rotationen av borrsträngen. Modellen återger de variationer i tryck och flöde som uppstår på grund av motorns geometri. Enkla modeller för berg och borrstål konstruerades för att simulera hela borrmaskinen. Även dessa modeller validerades mot mätningar. Resultaten från motormodellen bedöms vara tillräckligt bra för att i framtiden kunna användas för att simulera rotationen vid bergborrning. För att kunna se vad som orsakar ”jerky rotation” behövs dock bättre simuleringsmodeller av det hydrauliska försörjningssystemet som driver gerotormotorn. Eventuellt behövs också en bättre bergmodell.

Place, publisher, year, edition, pages
2014. , 76 p.
Keyword [sv]
gerotor, geroller, simulering
National Category
Other Mechanical Engineering
URN: urn:nbn:se:liu:diva-109942ISRN: LIU-IEI-TEK-A--14/01915--SEOAI: diva2:741684
External cooperation
Atlas Copco AB
Subject / course
Fluid and Mechanical Engineering Systems
Available from: 2014-08-29 Created: 2014-08-28 Last updated: 2014-08-29Bibliographically approved

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