Title: Dynamic modelling and vibration simulation of air bearing spindle systems due to unbalance

Authors: Hongrui Cao; Oltmann Riemer; Ekkard Brinksmeier

Addresses: Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi'an Jiaotong University, Xianning West Road 28, 710049, Xi'an, China ' LFM Laboratory for Precision Machining, University of Bremen, Badgasteiner Str. 2, 28359 Bremen, Germany ' LFM Laboratory for Precision Machining and MAPEX Center for Materials and Processes, University of Bremen, Badgasteiner Str. 2, 28359 Bremen, Germany

Abstract: Air bearing spindles are popularly used in ultra-precision machining, however, any slight mass unbalance in spindles can induce vibrations which may result in dimensional errors or poor surface finish of fabricated parts. In this paper, a complete dynamic model is proposed for air bearing spindle systems including air bearings, shaft, housing, and joint connections with the machine tool structure. The model is validated with experiments, and then vibration responses due to different types of unbalance are simulated quantitatively to reveal the characteristics of unbalance-induced vibrations. The results can provide proofs for the position selection of balancing planes as well as measurement points in automatic balancing process of air bearing spindles.

Keywords: dynamic modelling; vibration simulation; unbalance; air bearing spindles; ultra-precision machining.

DOI: 10.1504/IJMMS.2017.087549

International Journal of Mechatronics and Manufacturing Systems, 2017 Vol.10 No.3, pp.260 - 276

Received: 25 Nov 2016
Accepted: 05 Mar 2017

Published online: 12 Oct 2017 *

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