Effects of the cavitation in hydrodynamic bearings on the dynamic behavior of rotors

• Grant number: 16/20975-4
• Support Opportunities: Scholarships in Brazil - Master
• Start date: March 01, 2017
• End date: February 28, 2019
• Field of knowledge: Engineering - Mechanical Engineering - Mechanics of Solids
• Agreement: Coordination of Improvement of Higher Education Personnel (CAPES)
• Principal Investigator: Gregory Bregion Daniel
• Grantee: Douglas Jhon Ramos
• Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 15/20363-6 - Fault tolerant identification and control of rotating systems, AP.TEM

Abstract

The goal of this research project is to verify the influences of the cavitation phenomena occurring in hydrodynamic bearings in different operation conditions, allowing to analyze how the effects affect the results when compared to models that don't consider it in their formulation. For this, a model of a rotor will be developed and two different lubrication models will be applied for the bearing: the first considers the "Universal Cavitation Algorithm", in order to include the cavitation phenomena, while the second, that is more common in bearings simulation, doesn't takes this phenomena in consideration (classic hydrodynamic lubrication). These models allow the calculation of the pressure distribution acting on the bearing and, consequently, the hydrodynamic forces acting on the rotor. The rotor's behavior and the hydrodynamic forces developed on the bearing will be calculated using a numerical integrator, in order to solve the equations of motion of the system. As two different lubrication models are considered, two different rotor responses will be obtained. Both solutions will be compared for different geometries of cylindrical bearings and operational conditions, such as rotational speed, loads and unbalanced forces. The differences between both models will be analyzed and discussed, in order to verify the operational conditions where the cavitation's effects are important. This project is a part of the thematic project 2015/20363-6 "Fault tolerant identification and control of rotating systems" in relation to the analysis of the cavitation phenomena as an operational condition which leads to failure in the bearing. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

RAMOS, DOUGLAS JHON; RAMOS, LEANDRO ITO; DANIEL, GREGORY BREGION. Stability Analysis of Rotating Systems Supported by Textured Journal Bearings. JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME, v. 142, n. 3, MAR 2020. (15/20363-6, 15/20036-5, 16/20975-4)

RAMOS, LEANDRO ITO; RAMOS, DOUGLAS JHON; DANIEL, GREGORY BREGION. Evaluation of textured journal bearings under dynamic operating conditions in rotating machinery. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, v. 234, n. 6, p. 16-pg., 2019-11-05. (15/20363-6, 16/20975-4, 15/20036-5)

RAMOS, LEANDRO ITO; RAMOS, DOUGLAS JHON; DANIEL, GREGORY BREGION. Evaluation of textured journal bearings under dynamic operating conditions in rotating machinery. PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART J-JOURNAL OF ENGINEERING TRIBOLOGY, NOV 2019. (15/20363-6, 15/20036-5, 16/20975-4)

RAMOS, DOUGLAS J.; FERRAZ, ADAMO R.; DANIEL, GREGORY B.; RITTO, THIAGO G.; CAVALCA, KL; WEBER, HI. Dynamic Analysis of Rotating Systems Considering Uncertainties in the Bearings' Parameters. PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ROTOR DYNAMICS - IFTOMM, VOL. 4, v. 63, p. 15-pg., 2019-01-01. (15/20363-6, 16/20975-4)

ITO, L. R.; RAMOS, D. J.; SILVEIRA, Z. DE C.; DANIEL, G. B.; CAVALCA, KL; WEBER, HI. Parametric Sensitivity Analysis of Tilting Pad Bearings to Investigate the Dynamic Behavior of Rotating Machines. PROCEEDINGS OF THE 10TH INTERNATIONAL CONFERENCE ON ROTOR DYNAMICS - IFTOMM, VOL. 1, v. 60, p. 15-pg., 2019-01-01. (15/20363-6, 16/20975-4, 15/20036-5)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

RAMOS, Douglas Jhon. Bearing's cavitation effects on the rotor dynamic behavior. 2019. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica Campinas, SP.