Dynamic behaviours of a full floating ring bearing supported turbocharger rotor with engine excitation

Tian, Liang; Wang, W.J.; Peng, Zhi Jun

doi:10.1016/j.jsv.2011.04.031

Cited by 65 publications

(34 citation statements)

References 31 publications

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“…The bush in the middle is free to rotate due to the shear drag of the inner film. Numerous papers are dedicated to these types of bearings [1][2][3][4][5][6][7][8]. A thorough rotordynamic investigation was conducted by Gunter and Chen [1], which identified three unstable modes in the operation range of turbocharger with floating ring bearing.…”

Section: Introductionmentioning

confidence: 99%

“…To avoid the total instability (or critical limit cycles), Tian et al [3] examined the effect of outer clearance of the FRB as a controlling design parameter by changing which the critical limit cycle oscillations are removed. They also investigated the operation of floating ring bearings with external excitations transmitted from the engine [4]. San Andres et al [5] explored thermohydrodynamic behavior of floating bush bearings used in small turbochargers and showed that they exhibit large amplitude sub-synchronous vibrations in a large range of speeds.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Transient Modeling and Design of Turbocharger Rotor/Semi-Floating Bush Bearing System

Cao¹,

Dousti²,

Allaire³

et al. 2017

Lubricants

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This work presents the bearing design and analysis of radial semi-floating bush oil lubricated bearings for a typical industrial turbocharger configuration. Initially, the stability analysis for a linear rotor/bearing system is evaluated through eigenvalues and eigenvectors. The stiffness and damping coefficients of the inner oil film are obtained for the linear modeling process. The operating speed range of the turbocharger is high enough, at 21,000 to 24,000 rpm, to be unstable, indicating that the analysis should be and is carried out with nonlinear transient modeling. The nonlinear transient analysis evaluates the rotor and bush limit cycle orbits, rotor dynamics, the forces acting on the rotor and semi-floating bush surfaces, the oil flow through the bearing, the oil temperatures, and the power loss of the two oil films. The optimum design of a set of semi-floating bush bearings for this application depends strongly upon the clearances of the bush and squeeze film damper, usually expressed as the non-dimensional clearance to radius ratio. A typical clearance is evaluated to determine the bearing performance in terms of orbit size, forces acting on the bush and squeeze damper surfaces, oil flow through the bearing, power loss, and thermal heating. The nonlinear transient orbit values are evaluated for frequency content using the FFT to determine which orbits show both the synchronous and sub-synchronous vibration components and the associated rotor modes excited. These results are compared to the linear analysis over the operating speed range. The oil flow through the bearing component is much larger than the squeeze film damper. The forces acting on the bush and squeeze damper surfaces are related to the fatigue life of the bearing.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Transient Modeling and Design of Turbocharger Rotor/Semi-Floating Bush Bearing System

Cao¹,

Dousti²,

Allaire³

et al. 2017

Lubricants

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show abstract

“…The theory of the lubrication of a radial sliding bearing introduces theories for a fixed bush, shaft neck rotation and/or revolution (Wen & Huang, 2008;Sfyris & Chasalebris, 2012;Santos et al, 2012;Kasolanga et al, 2012), but is inadequate for modeling the other complex conditions (Wang et al, 2004;Li et al, 2005;Wang et al, 2010;Tian et al, 2011;Tian et al, 2012;Yu et al, 2013). In this paper, the theory of continuous oil film lubrication of a radial sliding bearing will be extended to three cases: the shaft neck rotation and bush rotation bearing, the rotation load bearing, and the floating sleeve bearing.…”

Section: Introductionmentioning

confidence: 99%

Applications of the Theory of Continuous Oil Film Lubrication of a Radial Sliding Bearing for Three Combined Conditions

Li¹,

Li²

2016

APR

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The theory of lubrication of a radial sliding bearing is extended to three cases: the shaft neck rotation and bush rotation bearing, the rotating load bearing, and the floating sleeve bearing. For the bearing with rotating shaft neck and rotating bush, fixing the observer at the bushing can enable the determination, in a simple and more accurate manner, of the bearing capacity of the bearing with the rotating load. As long as a rotating load exists, whirl exists; if the shaft rotation speed is 2 times the load rotation speed, then the eccentricity reaches the maximum.

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“…También se deben considerar las fuerzas de excitación que actúan sobre el rotor, como por ejemplo, en el caso de TC de MCIA pueden estar relacionadas con el desequilibrio del rotor, fuerzas pulsantes relacionadas con los gases de escape o del aire en la admisión o excitaciones estructuras provenientes del motor. La identificación de los puntos críticos de funcionamiento en TC pueden ser identificados con un modelo lineal mediante diagramas de Campbell [8], [9], [10], [11]. Sin embargo, estos se han realizado para TC con cojinetes flotantes y existen discrepancias entre los regímenes de giro de los puntos críticos.…”

Section: Introductionunclassified

“…Sin embargo, estos se han realizado para TC con cojinetes flotantes y existen discrepancias entre los regímenes de giro de los puntos críticos. Para la validación de los modelos de dinámica rotacional se han utilizado diferentes técnicas de medida como por ejemplo: sensores inductivos [10], [11] y vibrómetros de láser Doppler [12]. En este trabajo se ha utilizado una técnica de medida basada en el efecto albedo con sensores infrarrojos.…”

Section: Introductionunclassified

Modelo lineal para la identificación de velocidades críticas en un turbocompresor de MCIA

Hidalgo¹,

Serrano²,

Dolz³

2014

Ings

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Recibido: 07-10-2014, Aprobado tras revisión: 22-11-2014. Forma sugerida de citación: López, M.; Serrano, J.; Dolz, V. (2014). "Modelo lineal para la identificación de velocidades críticas en un turbocompresor de MCIA ". Ingenius. N.• 12, (Julio-Diciembre). pp. 55-61. ISSN: 1390-650X. Resumen AbstractLos modelos lineales para identificar los puntos críti-cos de funcionamiento de ejes dependen en gran medida de los coeficientes lineales que representan la película de lubricación en la que el eje se apoya y las fuerzas de excitación del eje. Sin embargo, la magnitud de los coeficientes de la película de lubricación determinados en los estudios de dinámica rotacional para turbocompresores (TC) de motores de combustión interna alternativos (MCIA) todavía presentan una gran incertidumbre, es por esto por lo que se han estimado los coeficientes lineales que representan la película de lubricación hidrodinámica en un turbocompresor de automoción con cojinete semiflotante mediante diferentes metodologías. Estas metodologías están basadas en la resolución de la película de lubricación con la ecuación de Reynolds mediante diferentes aproximaciones. Estas aproximaciones son la de cojinete corto y la de cojinete de largo infinito. Para generar las fuerzas de excitación sobre las ruedas del compresor y de la turbina se han hecho ensayos con distintas magnitudes con una frecuencia síncrona. Al final, los parámetros de entrada del modelo (coeficientes lineales de la película de lubricación y fuerzas síncronas) son ajustados con medidas experimentales de la órbita descrita por la punta del eje en el lado del compresor y se han identificado los principales puntos críticos de funcionamiento relacionados con la frecuencia síncrona del eje mediante un diagrama de Campbell. Los resultados obtenidos son validados con medidas experimentales.Linear models to identify critical points of operation depend largely on linear coefficients representing film lubrication, in which the shaft is supported, and the exciting forces of the shaft. However, the magnitudes of the coefficients of the oil film determined in rotational dynamics studies of small turbochargers (TC) still have great uncertainty. In present paper the linear coefficients of the film hydrodynamic lubrication in automotive turbocharger with semi-floating bearings have been estimated using different methodologies. These methodologies are based on the resolution of the film lubrication Reynolds equation using different approaches. These approaches are short bearing and long infinite bearing. Different tests have been made with various magnitudes with a synchronous frequency to generate excitation forces on the compressor and turbine wheels. At the end, the input parameters of the model (linear coefficients of the lubrication film and synchronous forces) are fitted in order to predict the measured orbit described by the shaft tip on the compressor side. The main critical operation points have been identified by a Campbell diagram. These points are related with the synchronous freque...

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Dynamic behaviours of a full floating ring bearing supported turbocharger rotor with engine excitation

Cited by 65 publications

References 31 publications

Nonlinear Transient Modeling and Design of Turbocharger Rotor/Semi-Floating Bush Bearing System

Nonlinear Transient Modeling and Design of Turbocharger Rotor/Semi-Floating Bush Bearing System

Applications of the Theory of Continuous Oil Film Lubrication of a Radial Sliding Bearing for Three Combined Conditions

Modelo lineal para la identificación de velocidades críticas en un turbocompresor de MCIA

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