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TECHNICAL PAPERS

Numerical Analysis of a Coupled Porous Journal and Thrust Bearing System

[+] Author and Article Information
Takuji Kobayashi

R & D Center, NTN Corporation, 3066 Higashikata, Kuwana, Mie 511-8678, Japan

Hiroshi Yabe

Department of Mechanical Engineering, Osaka Electro-Communication University, Neyagawa, Osaka 572-8530, Japan

J. Tribol 127(1), 120-129 (Feb 07, 2005) (10 pages) doi:10.1115/1.1828454 History: Received February 23, 2004; Revised August 09, 2004; Online February 07, 2005
Copyright © 2005 by ASME
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References

Figures

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Outline of the bearing system and coordinate system: (a) outline of the bearing system; (b) coordinate system
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Schematic of the groove structure
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Schematic diagram of herringbone grooves: (a) unwrapped geometry of HGJB; (b) HGTB
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Pressure distribution (ε0=0,J=2.5): (a) overall pressure distribution except the lower HGTB and Chamber 5; (b) pressure distributions of the HGJBs and the corresponding solid HGJBs
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Dimensionless Chamber 3 pressure PCh.3* versus permeability parameter J for downwardly and upwardly tapered-off radial clearance (ε0=0)
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Dimensionless Chamber 3 pressure PCh.3* versus eccentricity ratio ε0 for the porous (J=2.5) and solid sleeves for straight radial clearance
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Dimensionless equilibrium film gap H⁁T of the HGTBs versus permeability parameter J for downwardly and upwardly tapered-off radial clearance (ε0=0)
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Dimensionless equilibrium film gap H⁁T of the HGTBs versus eccentricity ratio ε0 for the porous (J=2.5) and solid sleeves for straight radial clearance
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Dimensionless dynamic coefficients of the HGJBs versus permeability parameter J for downwardly and upwardly tapered-off radial clearance (ε0=0): (a) stiffness coefficients; (b) damping coefficient Cxx
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Dimensionless dynamic coefficients of the HGTBs versus permeability parameter J for downwardly and upwardly tapered-off radial clearance (ε0=0): (a) stiffness coefficient Kzz; (b) damping coefficient Czz
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Dimensionless dynamic coefficients of the HGJBs versus eccentricity ratio ε0 for the porous (J=2.5) and solid sleeves for straight radial clearance: (a) stiffness coefficients; (b) damping coefficients
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Dimensionless dynamic coefficients of the HGTBs versus eccentricity ratio ε0 for the porous (J=2.5) and solid sleeves for straight radial clearance: (a) stiffness coefficient Kzz; (b) damping coefficient Czz
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Dimensionless critical mass M⁁cr versus permeability parameter J for downwardly and upwardly tapered-off clearance conditions (ε0=0)

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