Investigation on the angular displacements influence and nonlinear effects on thrust bearing dynamics

Peixoto, Thales Freitas; Cavalca, Kátia Lucchesi

doi:10.1016/j.triboint.2018.11.019

Cited by 14 publications

(3 citation statements)

References 27 publications

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“…where A,B,C,D are empirical coefficient, respectively. 30 In this paper, we take A=0.27, B=0.43 Gpa, C = 6.93, D = 0.022. The bearing centrifugal force can be calculated by equation (39), 31…”

Section: Dynamic Model Of Ceramic Angular Contact Bearingmentioning

confidence: 99%

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Nonlinear dynamic characteristics of full-ceramic motorized spindle considering axial transfer of unbalanced magnetic pull

Zhang

Liqi

Zhan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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Full-ceramic motorized spindle is suitable for high-grade CNC machine tool due to its high stiffness and wear resistance, while axial transfer of unbalanced magnetic pull (UMP) caused by reverse magnetic characteristic leads to random vibration at the shaft end. In order to investigate the nonlinear dynamics of full-ceramic motorized spindles under the influence of reverse magnetic, a five-degree-of-freedom dynamic model of bearing-rotor system considering the axial transfer of UMP is constructed. The improved transfer matrix method is proposed to establish the axial transfer model of UMP and the vibration mode of the shaft is obtained. The dynamic characteristics of the bearing-rotor system are analyzed considering the effect of UMP. The magnetic field density and vibration characteristics of the motorized spindle system is studied, and the full-ceramic motorized spindle shaft influence of UMP axial transfer, the vibration of the rotor tends to decrease from inward to outward, while the shaft end vibration also tends to increase gradually with the increase of rotation speed and eccentricity value. The results show that the vibration of ceramic shaft end is 55.4% weaker than that of metal shaft end. It can be seen that under the action of the diamagnetic property, UMP transfer occurs on the ceramic shaft, which reduces the vibration. The experiments show that the average error between the calculated value and the experimental result is 8.5% at the operating speed, which verifies the accuracy of the model developed in this paper.

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Section: Dynamic Model Of Ceramic Angular Contact Bearingmentioning

confidence: 99%

“…where A , B , C , D are empirical coefficient, respectively. 30 In this paper, we take A =0.27, B =0.43 Gpa, C = 6.93, D = 0.022.…”

Section: Dynamic Model Of Full-ceramic Motorized Spindle Considering ...mentioning

confidence: 99%

Nonlinear dynamic characteristics of full-ceramic motorized spindle considering axial transfer of unbalanced magnetic pull

Zhang

Liqi

Zhan

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Nonlinear dynamics of inertial actuators is investigated in [10]. Nonlinear effects in dynamics of bearings are presented in [11]. Nonlinear contact dynamics of ultrasonic actuator is investigated in [12].…”

Section: Introductionmentioning

confidence: 99%

Vibroimpact mechanism in one separate case

Ragulskis¹,

Ragulskis²

2019

Math. models, eng.

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It is known that in the vibroimpact system at the chosen values of parameters linear relationship between impact velocities and eigenfrequencies may exist. The purpose of this paper is to reveal the qualities of the systems of this type. Investigations are performed by analytical and numerical methods. It is determined that in the systems of this type nonlinear solutions with infinite series of harmonics exist. Multivalued stable and unstable regimes do not exist in the systems. The obtained analytical relationships enabled to reveal new qualities of the systems and to make useful conclusions. Keywords: characteristics of impact velocity and eigenfrequencies, free and decaying vibrations, phase trajectories of motions, harmonics of motions up to infinity.

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A Review on the Rotor Dynamics of Automotive Turbochargers

Peixoto

Cavalca

2022

Mechanisms and Machine Science

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Investigation on the angular displacements influence and nonlinear effects on thrust bearing dynamics

Cited by 14 publications

References 27 publications

Nonlinear dynamic characteristics of full-ceramic motorized spindle considering axial transfer of unbalanced magnetic pull

Nonlinear dynamic characteristics of full-ceramic motorized spindle considering axial transfer of unbalanced magnetic pull

Vibroimpact mechanism in one separate case

A Review on the Rotor Dynamics of Automotive Turbochargers

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