On the Stiffness and Damping Coefficients of Constant Flow Valve Compensated Conical Hydrostatic Journal Bearing with Micropolar Lubricant

Rana, Narendra Kumar; Gautam, Satyam Shivam; Verma, Suresh; Rahmani, Faisal

doi:10.1016/j.protcy.2016.03.074

Cited by 5 publications

(3 citation statements)

References 14 publications

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“…The multirecess externally pressurised journal bearing with micropolar lubrication has been studied by Verma et al [1]. Rana et al have studied theoretically the effect of micropolar fluid parameters on the steady state as well as stiffness and damping characteristics of 4-pocket constant flow valve compensated hydrostatic conical journal bearing [2,3]. Sharma et al [4,5] theoretically analyzed the effect of wear on the characteristics of a 4 pocket hydrostatic/hybrid conical journal bearing system for different cone angles with different restrictors for different load arrangements.…”

Section: Introductionmentioning

confidence: 99%

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

2019

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This paper presents the theoretical analysis on the effect of two different load arrangements for a conical multirecess hybrid journal bearing. For this analysis constant flow valve restrictors are used under micropolar lubricant for different semi cone angles. The modified Reynolds equation using micropolar fluid flow on the conical surface has been solved with the use of FEM and Galerkin's technique applying proper boundary conditions in the iterative scheme. The study suggests that the configuration LA I can be a better alternative as compared to LA II for different semi-cone angles and external load in terms of bearing characteristics. Keywords CFV restrictor • Conical bearing • Micropolar lubrication • FEM List of symbols a b Axial bearing land width, mm A p Area of pocket, mm 2 A b Area of bearing, mm 2 A e Area of each element c Radial clearance, mm C ij Fluid film damping coefficients (N/mm 2), (i, j = x, z) D m Mean journal diameter of conical shaft, mm e Eccentricity, mm F Fluid film reaction F x , F z Fluid film reaction component, N h Fluid film thickness, mm l m ,l Bearing characteristic length L Bearing length, mm M Journal mass, kg p s Supply pressure, N/mm 2 Q Lubricant flow (mm 3 /s) R j Journal radius, mm r Radial coordinate S ij Fluid film stiffness coefficients (N/mm),

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Section: Introductionmentioning

confidence: 99%

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

2019

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“…However, if there are curvilinear and / or internal boundaries in the computational domain, the finite difference method is practically not applicable. As an alternative, you can use the finite element method, which is devoid of these shortcomings, for example, in [12] this method was applied to a conical micropolar lubricating bearing with internal pocket chambers. Unfortunately, in this paper there is no detailed description of the finite element method.…”

Section: Introductionmentioning

confidence: 99%

On finite element model for hydrodynamic journal bearing with micropolar lubrication

Majorov¹

2019

BALTTRIB

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The aim of the present work is to develop a finite element model for calculating the pressure of a hydrodynamic fluid-film bearing with micropolar lubrication. The mathematical model is based on the generalized Reynolds equation. Two types of bearings, immersed and with axial lubrication, are considered, for which effective and robust pressure field calculation algorithms are proposed based on the finite element method. In following, the pressure fields are used to determine the static and dynamic integral bearing characteristics.

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“…So far many relevant indirect identification methods have already been proposed [1][2][3][4] based on the rotor-bearing system and corresponding dynamic measurements.…”

Section: Introductionmentioning

confidence: 99%

Identification of oil-film coefficients for a rotor-journal bearing system based on equivalent load reconstruction

Liu

Han

et al. 2016

Tribology International

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In this paper, a laboratory method based on equivalent dynamic load reconstruction is proposed for the identification of oil-film coefficients. When modeling the rotor, the oil-film supports are considered as its dynamic load boundary conditions. Consequently, the identification of oil-film coefficients is first converted to the reconstruction of equivalent dynamic loads. Through Green's function method and regularization, the equivalent dynamic oil-film loads can be steadily and precisely reconstructed. Then, according to the mechanical relationships between the oil-film properties and the corresponding equivalent loads, the oil-film stiffness and damping coefficients are identified using least square scheme. A rotor structure with two journal bearings is investigated and the identification results of oil-film coefficients demonstrate the validity and accuracy of the proposed method.

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On the Stiffness and Damping Coefficients of Constant Flow Valve Compensated Conical Hydrostatic Journal Bearing with Micropolar Lubricant

Cited by 5 publications

References 14 publications

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

Stiffness and damping characteristics of conical multirecess hybrid journal bearing for different load arrangements

On finite element model for hydrodynamic journal bearing with micropolar lubrication

Identification of oil-film coefficients for a rotor-journal bearing system based on equivalent load reconstruction

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