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Separation/recontact investigation of a travelling oscillator over a plate with inclusion of surface roughness

Foyouzat, M. A ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1016/j.tws.2022.110373
  3. Publisher: Elsevier Ltd , 2023
  4. Abstract:
  5. It is well understood that when an object travels over a supporting plate, their initial contact is most likely to be lost, particularly in the presence of surface roughness. While there is a voluminous literature on the analysis of plates excited by travelling objects, the existing studies have neglected the possibility of separation between contacting bodies in the problem formulation. On that account, this paper attempts to develop an approach in order to improve the previously-adopted methods by allowing for the separation along with effectively taking care of the subsequent recontact between the travelling superstructure and the supporting plate. Furthermore, by considering the so-called concept of restitution coefficient at the point of recontact, different impact situations are examined and discussed. Numerical examples are then presented to investigate the effect of influential parameters on the behaviour of the system. It is shown that an accurate assumption of the impact condition is necessary to obtain a reliable prediction of the oscillator response. Nevertheless, the plate response, except for some localized outputs, is not as sensitive to the assumed restitution coefficient. The findings also suggest that separation can even take place at low velocities if roughness is involved in the problem. Moreover, it is indicated that neglecting the possibility of separation/recontact as well as surface roughness leads to seriously unsafe results with respect to both the plate and the oscillator response spectra. © 2022 Elsevier Ltd
  6. Keywords:
  7. Impact ; Plate ; Recontact ; Separation ; Surface roughness ; Travelling oscillator
  8. Source: Thin-Walled Structures ; Volume 183 , 2023 ; 02638231 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0263823122009259