Self-sustained vibrations of one disk rotor in two arbitrary length journal bearings

Аврамов, К. В.; Borysiuk, O.

doi:10.1016/j.mechmachtheory.2013.08.012

Cited by 10 publications

(2 citation statements)

References 23 publications

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“…Considering the bearing is always fixed on a base, that is v b = R b Ω b = 0. Then, equation (2.1) can be simplified according to [ 34 , 37 , 38 ]:

…”

Section: Forces In the Fluids Film Of The Journal Bearingmentioning

confidence: 99%

“…Although the model overcame the deficiency of a short bearing compared with other bearing models, it could be adopted only for continuous fluid film, thus it is widely used to describe the nonlinear sealing force in a rotor system [26][27][28]. The finite difference method (FDM) [29,30], partial derivative method (PDM) [31,32] and finite element method (FEM) [33,34] are the common solving methods for eight dynamic characteristics of a journal bearing with finite length. These dynamic coefficients are important for testing the dynamic model of the rotor system with a journal bearing of finite length.…”

Section: Introductionmentioning

confidence: 99%

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A superlinear iteration method for calculation of finite length journal bearing's static equilibrium position

et al. 2017

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Solving the static equilibrium position is one of the most important parts of dynamic coefficients calculation and further coupled calculation of rotor system. The main contribution of this study is testing the superlinear iteration convergence method—twofold secant method, for the determination of the static equilibrium position of journal bearing with finite length. Essentially, the Reynolds equation for stable motion is solved by the finite difference method and the inner pressure is obtained by the successive over-relaxation iterative method reinforced by the compound Simpson quadrature formula. The accuracy and efficiency of the twofold secant method are higher in comparison with the secant method and dichotomy. The total number of iterative steps required for the twofold secant method are about one-third of the secant method and less than one-eighth of dichotomy for the same equilibrium position. The calculations for equilibrium position and pressure distribution for different bearing length, clearance and rotating speed were done. In the results, the eccentricity presents linear inverse proportional relationship to the attitude angle. The influence of the bearing length, clearance and bearing radius on the load-carrying capacity was also investigated. The results illustrate that larger bearing length, larger radius and smaller clearance are good for the load-carrying capacity of journal bearing. The application of the twofold secant method can greatly reduce the computational time for calculation of the dynamic coefficients and dynamic characteristics of rotor-bearing system with a journal bearing of finite length.

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“…Considering the bearing is always fixed on a base, that is v b = R b Ω b = 0. Then, equation (2.1) can be simplified according to [ 34 , 37 , 38 ]:

…”

Section: Forces In the Fluids Film Of The Journal Bearingmentioning

confidence: 99%