Stability analyses of inclined rotor bearing system based on non-linear oil film force models

Liu, Z S; Ding, Qian; Sun, Liquan; Wang, Y L

doi:10.1177/0954406211414472

Cited by 4 publications

(4 citation statements)

References 9 publications

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“…Shi et al [26] studied the influence of pivot design on nonlinear dynamic characteristics of a vertical and horizontal rotor. Liu et al [27,28] applied numerical and experimental methods to study the periodic solution and stability of the inclined rotor journal bearing system. Capone's short bearing model was employed to describe the journal bearing support properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Weight Effects on the Critical Speed of Inclined Turbocharger Rotor System

Ouyang

Guo

et al. 2022

J Nonlinear Math Phys

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Turbochargers have been widely used in various base conditions, such as horizontal, vertical, or inclined. The prediction of the dynamics is of utmost importance to inclined turbocharger designers. In this paper, the effect of weight on the critical speed of an inclined turbocharger rotor coupled with floating ring bearings is investigated. The inclined turbocharger rotor is modeled by lumped mass model. The nonlinear floating ring bearing model is derived using Capone’s model. Then the nonlinear dynamic model of the turbocharger rotor system is obtained. The balance position of the turbocharger rotor system is obtained by solving the nonlinear static equation. Linear system of the turbocharger rotor system is derived based on the balance position, and the critical speed is obtained by solving an eigenvalue problem. Three vibration modes, i.e. conical whirl, cylindrical whirl, and bending are obtained. Increasing the inclined angle would decrease the critical speed. Increasing the inclined angle would decrease the critical speed. Among the three vibration modes, the critical speed of cylindrical whirl furnishes the highest decrease while the critical speed of bending attains the lowest decrease. The vertical turbocharger rotor has a more wide operating speed range than the horizontal turbocharger rotor.

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Section: Introductionmentioning

confidence: 99%

Investigation of Weight Effects on the Critical Speed of Inclined Turbocharger Rotor System

Ouyang

Guo

et al. 2022

J Nonlinear Math Phys

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“…Y. and Harsha (2005) made some researches on rotor's vibration properties supported by rolling element bearings with taking bearing structure, installation errors into consideration. Liu et al (2012) and Qian et al (2011) built the dynamic equations of the inclined rotor supported by journal bearing by the use of finite element method, and the equations are solved by Newmark method (Dukkipati et al, 2000). The influences of tilting angle with different loads on the vibration performance of the system are analyzed in detail.…”

Section: Introductionmentioning

confidence: 99%

Study on the dynamic performance of concrete mixer's mixing drum

et al. 2017

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Abstract. When working, the geometric distribution shape of concrete in concrete mixing truck's rotary drum changes continuously, which cause a great difficulty for studying the dynamic performance of the mixing drum. In this paper, the mixing system of a certain type of concrete mixing truck is studied. A mathematical formulation has been derived through the force analysis to calculate the supporting force. The calculation method of the concrete distribution shape in the rotary drum is developed. A new transfer matrix is built with considering the concrete geometric distribution shape. The effects of rotating speed, inclination angle and concrete liquid level on the vibration performance of the mixing drum are studied with a specific example. Results show that with the increase of rotating speed, the vibration amplitude of the mixing drum decreases. The peak amplitude gradually moves to the right with the inclination angle increasing. The amplitude value of the peak's left side decreases when tilt angle increases, while the right side increases. The maximum unbalanced response amplitude of the drum increases with the decrease of concrete liquid level height, and the vibration peak moves to the left.

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“…Varney et al 10 studied the influences of rotor's inclination on the system vibration considering the rotor crack detection. Liu et al 1,11 established the dynamic equations of the tilt rotor supported by journal bearing by using finite element method. The equations are solved by Newmark method.…”

Section: Introductionmentioning

confidence: 99%

“…Liu et al. 1,11 established the dynamic equations of the tilt rotor supported by journal bearing by using finite element method. The equations are solved by Newmark method.…”

Section: Introductionmentioning

confidence: 99%

Study on the dynamic performance of tilt rotor supported by spherical roller bearings

Yang

Zeng

Zhu

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part K:

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Tilt rotor supported by rolling bearings is often used in mechanical equipment. In the past, researches on dynamic performance of bearing-rotor were mainly carried out for horizontal rotor, but there is insufficient reported research on the tilting rotors. In this paper, the dynamic performance of a tilt rotor supported by spherical roller bearings is studied. Through the dynamics analysis of the rotor, a transfer matrix dynamics model for the tilt rotor is established. The stiffness and damping calculation model of spherical roller bearings is built. With a calculation example, the effects of tilting angles and some rotor structure parameters on the system's dynamic performance are studied numerically. The results obtained show that with the increase in the tilt angle, the critical speed of the rotor decreases, and the amplitude increases in the vertical direction of the shaft. With the same tilting angle, the smaller the distance from the disc to the middle point of the rotating shaft, the larger the amplitude of the vibration mode and the amplitude difference compared to that of the rotor without inclination. The unbalanced response amplitude curves of the rotor distribute asymmetrically because of the rotor's inclination. The bigger the inclination angle, the more obvious is the asymmetry distribution.

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Stability analyses of inclined rotor bearing system based on non-linear oil film force models

Cited by 4 publications

References 9 publications

Investigation of Weight Effects on the Critical Speed of Inclined Turbocharger Rotor System

Investigation of Weight Effects on the Critical Speed of Inclined Turbocharger Rotor System

Study on the dynamic performance of concrete mixer's mixing drum

Study on the dynamic performance of tilt rotor supported by spherical roller bearings

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