Stability Analysis of a High-Speed Automotive Turbocharger

Kirk, R. G.; Alsaeed, Ali A.; Gunter, E. J.

doi:10.1080/10402000701476908

Cited by 52 publications

(29 citation statements)

References 4 publications

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“…This model was somewhat similar to that used in the FRB analysis in [19]: the turbine (shaded) was integral with the shaft (i.e. one material code used), with discs added to correct the diametral and polar moments of inertia; the aluminium compressor was modeled as discs added to the steel shaft, correcting both the mass and the moments of inertia.…”

Section: Simulations and Discussionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of a Turbocharger on Foil-Air Bearings With Focus on Stability and Self-Excited Vibration

Bonello

Pham

2014

Volume 7B: Structures and Dynamics

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This paper presents a generic technique for the transient nonlinear dynamic analysis (TNDA) and the static equilibrium stability analysis (SESA) of a turbomachine running on foil air bearings (FABs). This technique is novel in two aspects: (i) the turbomachine structural model is generic, based on uncoupled modes (rotor is flexible, non-symmetric and includes gyroscopic effects; dynamics of support structure can be accommodated); (ii) the finite-difference (FD) state equations of the air films are preserved and solved simultaneously with the state equations of the foil structures and the state equations of the turbomachine modal model, using a readily available implicit integrator (for TNDA) and a predictor-corrector approach (for SESA). An efficient analysis is possible through the extraction of the state Jacobian matrix using symbolic computing. The analysis is applied to the finite-element model of a small commercial automotive turbocharger that currently runs on floating ring bearings (FRBs) and is slightly adapted here for FABs. The results of SESA are shown to be consistent with TNDA. The case study shows that, for certain bearing parameters, it is possible to obtain a wide speed range of stable static equilibrium operation with FABs, in contrast to the present installation with FRBs. INTRODUCTIONThe dynamics of FAB turbomachinery are governed by the interaction between the turbomachine, air films and foil structures. Due to the computational burden involved, the solution process has been subject to simplifications to three aspects of the problem:  The compressible Reynolds equation (RE) governing the air film pressure distribution;  The structural model of the turbomachine;  The foil structure model. This paper addresses the current simplifications to the first two aspects.

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Section: Simulations and Discussionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of a Turbocharger on Foil-Air Bearings With Focus on Stability and Self-Excited Vibration

Bonello

Pham

2014

Volume 7B: Structures and Dynamics

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“…In this section the analysis is applied to a small commercial automotive turbocharger rotor whose finite element (FE) model was supplied by industry (Figure 2(a)). This model was somewhat similar to that used in the FRB analysis in [19]: the turbine (shaded) was integral with the shaft (i.e. one material code used), with discs added to correct the diametral and polar moments of inertia; the aluminium compressor was modeled as discs added to the steel shaft, correcting both the mass and the moments of inertia.…”

Section: Turbocharger Simulationsmentioning

confidence: 99%

Nonlinear Dynamic Analysis of High Speed Oil-Free Turbomachinery With Focus on Stability and Self-Excited Vibration

Bonello

Pham

2014

Journal of Tribology

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This paper presents a generic technique for the transient nonlinear dynamic analysis (TNDA) and the static equilibrium stability analysis (SESA) of a turbomachine running on foil air bearings (FABs). This technique is novel in two aspects: (i) the turbomachine structural model is generic, based on uncoupled modes (rotor is flexible, nonsymmetric and includes gyroscopic effects; dynamics of support structure can be accommodated) and (ii) the finite-difference (FD) state equations of the air films are preserved and solved simultaneously with the state equations of the foil structures and the state equations of the turbomachine modal model, using a readily available implicit integrator (for TNDA) and a predictor-corrector approach (for SESA). An efficient analysis is possible through the extraction of the state Jacobian matrix using symbolic computing. The analysis is first applied to the finite-element model of a small commercial automotive turbocharger that currently runs on floating ring bearings (FRBs) and is slightly adapted here for FABs. The results of SESA are shown to be consistent with TNDA. The case study shows that, for certain bearing parameters, it is possible to obtain a wide speed range of stable static equilibrium operation with FABs, in contrast to the present installation with FRBs. Application of the method to a test rig reported in the literature reveals a reasonable degree of correlation between theory and experiment.

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“…Vibration-based condition monitoring of such rotors is therefore very much essential. Several earlier works [1][2][3] explained the stability analysis of high speed turbocharger rotor supported on the full floating ring bearings system. Vibration control in rotors is an active topic of research for several decades.…”

Section: Introductionmentioning

confidence: 99%

Semi-active vibration control of high-speed rotor system with electrorheological bearing fluid

Mutra

Srinivas

2018

MATEC Web Conf.

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Present work focuses on the use of electrorheological fluid (ERF) as a lubricant in the high speed turbocharger rotor supported on floating ring bearings. The rotor is analysed by finite element modelling with gyroscopic effects and bearing forces. The ERF contains one carrier fluid and active particles that react to external electric field, which induces a yield stress in the fluid increasing its viscosity. In order to control the rotor vibration amplitudes, the dynamic changes in the fluid viscosities at the inner and outer films of bearing are employed with external electric field. A case study of automotive turbocharger rotor is considered and the effect of semi-active control is illustrated on the dynamic response of the system.

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Stability Analysis of a High-Speed Automotive Turbocharger

Cited by 52 publications

References 4 publications

Nonlinear Dynamic Analysis of a Turbocharger on Foil-Air Bearings With Focus on Stability and Self-Excited Vibration

Nonlinear Dynamic Analysis of a Turbocharger on Foil-Air Bearings With Focus on Stability and Self-Excited Vibration

Nonlinear Dynamic Analysis of High Speed Oil-Free Turbomachinery With Focus on Stability and Self-Excited Vibration

Semi-active vibration control of high-speed rotor system with electrorheological bearing fluid

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