Release of acoustic energy during the fatiguing of a rolling-element bearing |
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| Affiliation: | 1. Etiology and Therapy of Periodontal Diseases (ETEP) Research Group, University Complutense, Madrid, Spain;2. Section of Post-Graduate Periodontology – Faculty of Odontology, University Complutense, Madrid, Spain;1. Drexel University, 3250 Chesnut St, Philadelphia, 19104, United States;2. Department of Fisheries and Wildlife, Michigan State University, 480 Wilson Rd, East Lansing, MI, 48824 USA;3. James Madison College, Michigan State University, 842 Chestnut Rd, East Lansing, MI, 48825 USA;1. Centro de Química and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal;2. Biophysics Unit, Faculty of Medicine of University of Coimbra, Azinhaga de Santa Comba, Celas, 3004-548 Coimbra, Portugal;3. CIMAGO – Center of Investigation in Environment, Genetics and Oncobiology, Faculty of Medicine of University of Coimbra, Azinhaga de Santa Comba, Celas, 3004-548 Coimbra, Portugal;4. IBILI – Institute for Biomedical Imaging and Life Science, Faculty of Medicine of University of Coimbra, Azinhaga de Santa Comba, Celas, 3004-548 Coimbra, Portugal;5. Applied Molecular Biology, University Clinic of Haematology, Faculty of Medicine of University of Coimbra, Coimbra, Portugal |
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| Abstract: | A simple theoretical model has been developed to describe the acoustic energy generated when a fine crack grows in a fatiguing rolling-element steel-bearing in the gearbox of a helicopter during flight. The acoustic-impulse's amplitude (at the bearing) and duration increase from 9.8 × 10-12 to 29.0 × 10-12 m, and from 0.1 to 1 μs, respectively, as the crack growth becomes critical. The detection and measurement of this acoustic energy can lead to the prediction of the associated crack-growth. |
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