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Lookup NU author(s): Chenggang Fang,
Dr Dehong Huo
This is the authors' accepted manuscript of an article that has been published in its final definitive form by Springer Nature, 2021.
For re-use rights please refer to the publisher's terms and conditions.
© 2021, The Author(s), under exclusive licence to Springer-Verlag London Ltd., part of Springer Nature. This paper investigates the influence of rotor coaxiality error on spindle accuracy under different operating conditions in the precision hydrostatic spindle with a mid-thrust bearing structure. Firstly, a linearized model of rotor dynamics equation with five degrees-of-freedom is established based on Newton’s law of motion and angular momentum principle. Then, by solving the Reynolds equation and the flow continuity equation using the mathematical perturbation method, the steady and transient pressure distribution functions of the hydrostatic bearings are obtained; subsequently, the stiffness and damping coefficient matrices of the spindle are determined. Furthermore, the linearized stiffness and damping coefficients are substituted into the rotor dynamics equation to obtain the instantaneous acceleration of the rotor, and the motion trajectory of the rotor is solved iteratively by the Euler method. Finally, the paper studies the influences of different rotor coaxiality, rotating speed, cutting load, oil supply pressure, and oil film clearance on dynamic characteristics, amplitude amplification factor, and radial runout of the spindle by computer simulation. The simulation results show that the spindle runout is more sensitive to rotor coaxiality error and oil film clearance.
Author(s): Fang C, Huo D, Huang X
Publication type: Article
Publication status: Published
Journal: International Journal of Advanced Manufacturing Technology
Print publication date: 01/05/2021
Online publication date: 24/03/2021
Acceptance date: 19/02/2021
Date deposited: 27/12/2021
ISSN (print): 0268-3768
ISSN (electronic): 1433-3015
Publisher: Springer Nature
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