Pneumatic hammer instability in the aerostatic journal bearing-rotor system: A theoretical and experimental analyses

[ X ]

Tarih

2021

Dergi Başlığı

Dergi ISSN

Cilt Başlığı

Yayıncı

Sage Publications Ltd

Erişim Hakkı

info:eu-repo/semantics/closedAccess

Özet

In this study, the pneumatic hammer instability phenomena in the aerostatic journal bearing-rotor system is analysed and discussed for different feeding hole configurations theoretically and experimentally. The influences of the configuration of the feeding holes on the nonlinear dynamics of the system are also investigated. The air flow between the surfaces is modelled with Reynold's equation and it is numerically solved with differential transform and finite difference hybrid method. Three different aerostatic bearings are modelled and simulated to investigate the influences of the configuration of the holes for different angular speeds. An experimental test rig is designed and tested for different rotor speeds to validate the obtained numerical results. The dynamic response of the system is analysed using waterfall plots, bifurcation diagrams, orbit plots, phase portrait and Poincare map, which are drawn to determine the pneumatic hammer instability region of the modelled system. The results reveal a nonlinear dynamic response of the rotor centre. In addition, the analysis shows that the feeding hole configuration affects the rotor dynamics and the pneumatic hammer instability region.

Açıklama

Anahtar Kelimeler

Aerostatic bearings, nonlinear rotor dynamics, pneumatic hammer instability

Kaynak

Proceedings of The Institution of Mechanical Engineers Part J-Journal of Engineering Tribology

WoS Q Değeri

Q3

Scopus Q Değeri

Q2

Cilt

235

Sayı

3

Künye