In the final assignment, we focused on measuring friction in hydrodynamic journal bearings. We performed a theoretical calculation, which was then compared to experimental results obtained through measurements on an existing laboratory test rig. The initial measurements showed a significant deviation between the analytical and experimental results, leading to an in-depth analysis of the friction coefficient measurement on the test rig. Due to the measurement method, the recorded values were not precise, and extensive modifications were necessary on the test rig, as described in this final work. Additionally, the paper also describes some essential challenges we encountered during the modifications. We also conducted comparisons between the old and new experimental measurements. Based on the results, it can be stated that the new method of measuring the friction coefficient is significantly more suitable as it ensures high repeatability of measurements, and the values align well with the analytically determined ones in the realm of hydrodynamic lubrication. The transition point from hydrodynamic to mixed friction can be determined with the help of new measurements, which was our main goal.
|
