Abstract
Prediction of the ring gear trajectory inside its housing is a fundamental issue for analysis of the dynamic behavior of the internal gear motors/pumps. However, it is not easy because of lots of phenomenon happening inside motors/pumps. The mobility method introduced by Booker proves that it can predict well the trajectory of the journal bearing by considering the effect of hydrodynamic lubrication regime of the oil film. Unlike journal bearings, the oil film in the internal gear motors/pumps is the combination of two simultaneous regimes; e.g., hydrodynamic and hydrostatic lubrication. This paper presents a hybrid method by adding the effect of hydrostatic lubrication into the original mobility method. A test rig is then designed and built up to validate the simulation results. The theoretical and experimental results have a reasonable agreement. Comparison the calculation and experimental results points out that the deviation of the eccentricity for mobility method is about 14.5 %. Meanwhile, the deviation for the hybrid method is about 3 %. Meaning that with hybrid mobility method increases the accuracy of calculation of the ring gear orbit.
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Recommended by Associate Editor Hyeong-Joon Ahn
Trong Hoa Pham was born in 1982. He received the B.Sc and M.Sc. degrees in mechanical engineering from University of Transport and Communication, Hanoi, Vietnam in 2005 and 2010, respectively, and his Dr.-Ing. at Technische Universität Dresden, Germany in 2018. His research interests are fluid power systems, components, and hydrodynamic bearing.
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Pham, T.H. Hybrid method to analysis the dynamic behavior of the ring gear for the internal gear motors and pumps. J Mech Sci Technol 33, 603–612 (2019). https://doi.org/10.1007/s12206-019-0114-7
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DOI: https://doi.org/10.1007/s12206-019-0114-7