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Nonlinear analysis and vibro-impact characteristics of a shaft-bearing assembly

Journal Article · · International Journal of Non-Linear Mechanics
 [1];  [2];  [3];  [1]
  1. New Mexico State University, Las Cruces, NM (United States)
  2. Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
  3. Sao Paulo State University, Sao Joao da Boa Vista (Brazil)

Here this study investigates the nonlinear frequency response of a shaft-bearing assembly with vibro-impacts occurring at the bearing clearances. The formation of nonlinear behavior as system parameters change is examined, along with the effects of asymmetries in the nominal, inherently symmetric system. The primary effect of increasing the forcing magnitude or decreasing the contact gap sizes is the formation of grazing-induced chaotic solution branches occurring over a wide frequency range near each system resonance. The system's nominal setup has very hard contact stiffness and shows no evidence of isolas or superharmonic resonances over the frequency ranges of interest. Moderate contact stiffnesses cause symmetry breaking and introduce superharmonic resonance branches of primary resonances. Even if some primary resonances are not present due to the system's inherent symmetry, their superharmonic resonances still manifest. Branches of quasiperiodic isolas (isolated resonance branches) are also discovered, along with a cloud of isolas near a high-frequency resonance. Parameter asymmetries are found to produce a few significant changes in behavior: asymmetric linear stiffness, contact stiffness, and gap size could affect the behavior of primary resonant frequencies and isolas.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Coordination for the Improvement of Higher Education Personnel (CAPES)
Grant/Contract Number:
NA0003525
OSTI ID:
2311247
Alternate ID(s):
OSTI ID: 2369002
Report Number(s):
SAND--2023-14944J
Journal Information:
International Journal of Non-Linear Mechanics, Journal Name: International Journal of Non-Linear Mechanics Journal Issue: NA Vol. 159; ISSN 0020-7462
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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