Nonlinear behavior analysis of a rotor on two-lobe wave journal bearings

Adiletta, Giovanni; Mancusi, Erasmo; Strano, Salvatore

doi:10.1016/j.triboint.2010.08.009

Cited by 9 publications

(11 citation statements)

References 14 publications

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“…Owing to the consequent radial dissymmetry, which can achieve a remarkable degree for suitable wave amplitudes, the waved bearing has a potential to affect the system's nonlinearity. The related chance to obtain positive effects onto the dynamic behaviour justifies the previous works, carried out by the author about rigid rotor on 2-lobe wave journal bearings [35] and on 2LWB-SFD [36], as well as the present investigation.…”

Section: Summary and Concluding Remarkssupporting

confidence: 82%

“…Details of the procedure to carry out numerical continuation have been reported in [35] and the further references given there.…”

Section: Results With φ¼0mentioning

confidence: 99%

“…According to [35,36], the dimensionless amplitude B and the orientation angle φ of the lobed profile of the damper bearing ( Fig. 2a), have been respectively assigned in the set (0, 0.05, 0.1, 0.15, 0.2) and in the whole interval [0, 2π] rad.…”

Section: Choice Of the Parameter Set For The Analysismentioning

confidence: 99%

“…The present author carried out a bifurcation analysis about an unbalanced rigid rotor on 2LWB (2 lobe-wave bearing) in a previous work [35], putting in evidence the dependence of the dynamic response on the wave amplitude and the angular position of the bearing profile. As observed in literature, in comparison to the other multi-lobe shapes, the two-lobe geometry shows the highest degree of deviation from radial symmetry.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the consequent chance of achieving a favourable influence onto the dynamic behaviour deserves some investigation. In the mentioned derivative with respect to τ paper [35], in fact, it was shown that a suitable choice of the geometrical parameters for the bearing profile made it possible to identify intervals of the operating speed range possibly characterized by safe or acceptable conditions. An analogous approach is adopted in the present study, replacing the 2LWB in the rotor support system with a roller bearing plus a SFD whose bush has a 2 lobe-wave bore.…”

Section: Introductionmentioning

confidence: 99%

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Bifurcating behaviour of a rotor on two-lobe wave squeeze film damper

Adiletta

2015

Tribology International

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Section: Summary and Concluding Remarkssupporting

confidence: 82%

“…Details of the procedure to carry out numerical continuation have been reported in [35] and the further references given there.…”

Section: Results With φ¼0mentioning

confidence: 99%

Section: Choice Of the Parameter Set For The Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bifurcating behaviour of a rotor on two-lobe wave squeeze film damper

Adiletta

2015

Tribology International

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Subcritical behaviour of short cylindrical journal bearings under periodic excitation

et al. 2023

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Rotating machinery supported on journal bearings is affected by forces due to rotating unbalance and pressure gradients in the oil film. The interaction of these forces can evoke nonlinear behaviour, including asynchronous motion and even chaos. This work attempts to characterise the sub-synchronous motion of the rigid rotor supported on cylindrical journal bearings due to the abovementioned interaction. The analysis focuses on the rotor behaviour at the rotor speeds lower than the threshold speed for oil whirl, associated with sub-synchronous vibration of magnitude equaling the bearing clearance. It is shown that the sub-synchronous vibration can occur well before reaching the threshold speed and that the underlying period-doubling bifurcation depends on the amount of the rotating unbalance. The rotor response and stability are analysed using a numerical continuation method employing the infinitely short journal bearing model. Continuation results are further validated by time simulations which utilise the finite difference method to compute the hydrodynamic forces. The validation process employs bifurcation diagrams, Poincaré sections and numerical estimates of the largest Lyapunov exponents.

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