Analyzing the use of pins in safety bearings

Cesar A. L. L. da Fonseca, Hans I. Weber, Philip F. Fleischer, Ilmar Santos

Research output: Contribution to journalJournal articleResearchpeer-review


A new concept for safety bearings is analyzed: useful in emergency situations, it shall protect the bearing from destruction by the use of pins which impact with a disc, both capable of good energy dissipation. Results of work in progress are presented by validating partial stages of the development. Starting with a disc without shaft impacting on pins, the second stage being a vertical rotor with a clamped-free shaft that is limited by pins to a final stage where the gap due to the pins is controlled by step motors. In the first stage, a numerical simulation performed by the Runge–Kutta method is validated with experimental results. Simulations of rotor orbits due to the impact condition are analyzed and compared to data obtained from the experiment giving a good perspective on the use of pins. The contact interaction between rotor and pins uses an elastic-dissipative model. In addition, the variation of energy content of the disc after each contact is considered. Actually, the validation of the clamped-free rotor is done. The main goal is to design an automatic system with the capability of changing the gap when necessary in order to avoid the rotor colliding with the inner part of the bearing.
Original languageEnglish
JournalJournal of the Brazilian Society of Mechanical Sciences and Engineering
Issue number4
Pages (from-to)1425-1434
Publication statusPublished - 2015

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