A new fluid film force model of elliptical bearing: Modelling and case studies

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 ]:

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Section: Forces In the Fluids Film Of The Journal Bearingmentioning

confidence: 99%

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

et al. 2017

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“…The lubrication characteristics for the journal bearings such as high load capability and low-temperature rise have been researched by theoretical analysis (Ebrahimi et al, 2019;Wang et al, 2010) and experimental analysis (Salazar and Santos, 2018;Shen et al, 2016), which have been given much more attention.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and experimental dynamics analysis of rotor-bearing system supported by elliptical bearings

Zhao

Zhang

Feng³

et al. 2020

ILT

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Purpose High power and speed are new demands for rotating machinery which needs the journal bearings with high dynamic characteristics. The critical speed of the rotor-bearing system is one of the most significant parameters to evaluate the dynamic characteristics. This paper aims to investigate the theoretical and experimental analysis of a rotor system supported by large diameter elliptical bearings. Design/methodology/approach To obtain the theoretical and experimental support for rotor-bearing system design, dynamic characteristics theoretical analysis based on the finite difference method is given and an experiment focuses on critical speed identification is carried out. Findings The theoretical calculation results indicate that the critical speed is near to 800 rpm and there is no large vibration amplitude round working speed (1,500 rpm). Using the test bench in the factory unit, vibration data including three experimental processes are obtained. According to the vibration data, the critical speed is identified which also indicates that it is stable when working at 1,500 rpm. Originality/value The design method for the rotor system supported by large diameter elliptical bearing can be obtained by the theoretical and experimental results shown in this paper. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0122/

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Active Vibration Control in Turbocharger Rotor System with the Use of Electromagnetic Actuator

Mutra

Srinivas

2020

Advances in Applied Mechanical Engineering

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A new fluid film force model of elliptical bearing: Modelling and case studies

Cited by 6 publications

References 14 publications

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

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

Theoretical and experimental dynamics analysis of rotor-bearing system supported by elliptical bearings

Active Vibration Control in Turbocharger Rotor System with the Use of Electromagnetic Actuator

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