Deutsch
English
Project leader: Prof. Dr.-Ing. Wesling, Dr.-Ing. D. Turschner
Funding period: 11/2022 - 01/2026
Funding body: DFG
Researcher: D. A. Piontek, M.Sc., Dipl.-Ing. A. Oberland
During operation, drive shafts are exposed to mechanical loads in the form of vibrations due to dynamically acting forces. Experience from the field of deep drilling technology shows that the stick-slip effect in particular has a significant influence on the available torque at low rotational speeds. In deep drilling technology, stick-slip vibrations are primarily induced by the contact between the drill head and the opposite rock formation. In a state of static friction (stick), the drill head does not rotate, whereas in a state of sliding friction (slip), it "slips" abruptly due to the torsional torque and therefore rotates significantly faster than the speed of the drive machine. Such torsional vibrations can lead to considerable damage to the components of the drive train. As the tribological relationships on the drill head are non-linear and depend on numerous, often unknown and changing parameters, it is difficult to control the torque on the drill head. The DFG-funded DäToNa project addresses this problem from a control engineering perspective, drawing on methods and models from the fields of drive technology, mechatronics and tribology.
The aim of the project is to develop an active damping of torsional vibrations, which occur as a result of the stick-slip effect due to self-excitation by negative gradients of the load input function (here: Stribeck curve) in long, difficult to access drive shafts (e.g. deep drilling rods) and lead to considerable damage to the drive train. Two test benches are available for this purpose, which can be used to quantify the tribological relationships on the drill head and to validate the adaptive controller to be developed.