Journal ArticleDOI
Stability Analysis of a Hydrodynamic Journal Bearing With Rotating Herringbone Grooves
Gunhee Jang,J. W. Yoon +1 more
TLDR
In this article, the stability of a hydrodynamic journal bearing with rotating herringbone grooves was investigated using the FEM and the perturbation method, and the stability was determined by solving Hill's infinite determinant of these algebraic equations.Abstract:
This paper presents an analytical method to investigate the stability of a hydrodynamic journal bearing with rotating herringbone grooves. The dynamic coefficients of the hydrodynamic journal bearing are calculated using the FEM and the perturbation method. The linear equations of motion can be represented as a parametrically excited system because the dynamic coefficients have time-varying components due to the rotating grooves, even in the steady state. Their solution can be assumed as a Fourier series expansion so that the equations of motion can be rewritten as simultaneous algebraic equations with respect to the Fourier coefficients. Then, stability can be determined by solving Hill's infinite determinant of these algebraic equations. The validity of this research is proved by the comparison of the stability chart with the time response of the whirl radius obtained from the equations of motion. This research shows that the instability of the hydrodynamic journal bearing with rotating herringbone grooves increases with increasing eccentricity and with decreasing groove number, which play the major roles in increasing the average and variation of stiffness coefficients, respectively. It also shows that a high rotational speed is another source of instability by increasing the stiffness coefficients without changing the damping coefficients.read more
Citations
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A Laser Surface Textured Journal Bearing
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TL;DR: In this article, the potential use of laser surface texturing (LST) in hydrodynamic journal bearings is examined theoretically, and the effect of such a texture on load capacity and on the attitude angle of the journal bearing is investigated.
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Stability analysis of a disk-spindle system supported by coupled journal and thrust bearings considering five degrees of freedom
TL;DR: In this paper, the stability of a disk-spindle system supported by coupled journal and thrust bearings considering the five degrees of freedom of a rotor-bearing system was investigated, and the critical mass of the rotor bearing system was determined by solving the linear equations of motion.
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Rotary Blood Pump With Opposing Spindle Magnets, Bore And Drive Windings
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References
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Journal ArticleDOI
Book Reviews : Nonlinear Oscillations: A.H. Nayfeh and D.T. Mook John Wiley & Sons, New York, New York 1979, $38.50
Book
Mechanical Vibration Analysis and Computation
David Newland,Eric E. Ungar +1 more
TL;DR: In this paper, the authors compared the methods of Galerkin and Bogoliubov for steady-state vibrations with those of Krylov-Bogolov and Ritz.
Journal ArticleDOI
Finite element analysis of herringbone groove journal bearings : A parametric study
TL;DR: In this article, a finite element analysis is introduced for prediction of the static and rotordynamic forced response in HGJBs with finite numbers of grooves, and a bearing geometry parametric study is then conducted to determine optimum rotord dynamic force coefficients.
Journal ArticleDOI
Calculation of dynamic coefficients in a hydrodynamic bearing considering five degrees of freedom for a general rotor-bearing system
Gunhee Jang,Y. J. Kim +1 more
TL;DR: In this article, the stiffness and damping coefficients in a hydrodynamic bearing considering five degrees of freedom for a general rotor-bearing system were calculated by using the finite element method.
Related Papers (5)
Nonlinear Dynamic Analysis of a Hydrodynamic Journal Bearing Considering the Effect of a Rotating or Stationary Herringbone Groove
Gunhee Jang,J. W. Yoon +1 more