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| Author(s): |
Douglas Jhon Ramos
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Faculdade de Engenharia Mecânica |
| Defense date: | 2023-02-16 |
| Examining board members: |
Gregory Bregion Daniel;
Katia Lucchesi Cavalca Dedini;
Aldemir Aparecido Cavalini Júnior;
Diogo Stuani Alves;
Rodrigo Nicoletti
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| Advisor: | Gregory Bregion Daniel |
| Abstract | |
Conventional hydrodynamic bearings applied to rotating machines are susceptible to some undesired conditions, such as fluid-induced instability, temperature rise and inefficiency in adjusting the load capacity. To avoid these conditions, a new concept of hydrodynamic bearing is proposed, in which the movement of its surface is considered, thus making it possible to change the average and relative speed of the lubricating oil film inside the bearing. In this work, the dynamic behavior of the rotor, as well as the hydrodynamic forces developed in the bearings, are initially evaluated through computational simulation, allowing to verify the advantages and improvements obtained with this new bearing concept. Numerical results show that this new bearing is able to avoid conditions associated with fluid-induced instability in the rotating system, in addition to acting to reduce oil temperature and bearing load capacity. The positive results obtained in the computational simulations allowed the idealization of the new bearing concept, contemplating alternatives for the entry of oil in the rotating bearing, as well as mechanical systems that would allow this type of movement in the bearing, ensuring the support of the rotor. The development and assembly of the prototype with rolling bearings enabled the development of the experimental test bench, set up at LAMAR with the objective of reproducing the tests obtained in the computational simulations. Experimental tests involving the adjustment of load capacity and mitigation of oil whirl effects showed that the new bearing concept can reproduce the main effects observed in computer simulations and represents a promising alternative to improve the performance of rotating machines (AU) | |
| FAPESP's process: | 18/11298-4 - Development of an active hydrodynamic bearing for application in rotary systems |
| Grantee: | Douglas Jhon Ramos |
| Support Opportunities: | Scholarships in Brazil - Doctorate |