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Bearing housing looseness effect on rotating machinery vibration

Behzad, M ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. Publisher: Society of Acoustics , 2023
  3. Abstract:
  4. Mechanical looseness is one of the common faults in rotating machinery. Wearing in the inner surface of the housing and outer race of the rolling element bearing (REB) increases the clearance and mechanical looseness that may lead to abnormal vibration in the machine. Mechanical looseness reduces the equivalent stiffness of the bearings leading to a reduction in the system's natural frequencies. In this study, finite element analysis (FEA) is used for numerical modeling of the mechanical looseness effect on the vibration characteristics of an industrial electrofan. To this aim, the variation of the shaft center displacement resulting from a specific load is investigated in terms of the shrink-fit size. In this study, shrink-fit size variation is applied between the inner surface of the housing and the outer race of the REB, as well as the inner race of the REB and the surface of the shaft. Results show that reducing the shrink-fit size from 25 μm to zero leads to 53% reduction of the equivalent stiffness. This lower stiffness causes 15% reduction in the natural frequencies of the machine and shifts it to the vicinity of the operating speed of the shaft. In this new machine condition resonance occurs which itself accelerates the wear and increases the mechanical looseness of the bearing in the housing. © 2023 Proceedings of the International Congress on Sound and Vibration. All rights reserved
  5. Keywords:
  6. Finite element analysis (FEA) ; Mechanical looseness ; Natural frequency ; Rolling elements bearing (REB) ; Shrink-fit
  7. Source: Proceedings of the International Congress on Sound and Vibration ; 2023 ; 23293675 (ISSN); 978-801103423-8 (ISBN)
  8. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85170638196&partnerID=40&md5=6011ee2e30c6e17d450743569c5f5da1