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research-article

NON-SYNCHRONOUS VIBRATION OF PLANAR AUTOBALANCER/ROTOR SYSTEM WITH ASYMMETRIC BEARING SUPPORT

[+] Author and Article Information
DaeYi Jung

Center of Integrated Smart Sensors, KAIST, Daejoen, KOREA
dyjung@kaist.ac.kr

Hans A. DeSmidt

Associate Professor, University of Tennessee at Knoxville, Knoxville, TN, USA
hdesmidt@utk.edu

1Corresponding author.

ASME doi:10.1115/1.4035814 History: Received March 10, 2016; Revised January 09, 2017

Abstract

Due to inherent nonlinearity of the autobalancer, the potential for other, undesirable, non-synchronous limit-cycle vibration exists. In such undesirable situations, the balancer masses do not reach their desired synchronous balanced steady-state positions resulting in increased rotor vibration. Such behavior has been widely studied and is well understood for rotor systems on idealized bearings with symmetric supports. However, a comprehensive study into this non-linear behavior of an imbalanced planar rigid rotor/ABD system mounted on a general bearing holding asymmetric damping and stiffness forces including non-conservative effects cross-coupling ones has not been fully conducted. Therefore, this research primarily focuses on the unstable non-synchronous limit-cycle behavior of and the synchronous balancing condition of system under the influence of the general bearing support. Here, solutions for rotor limit-cycle amplitudes and corresponding whirl speeds are obtained via a harmonic balance approach. Furthermore, the limit-cycle stability is assessed via perturbation and Floquet analysis and all possible responses including undesirable coexistence for the bearing parameters and operating speeds have been thoroughly studied. It is found that, due to asymmetric behavior of bearing support, the multiple limit cycles are encountered in the range of supercritical speeds and more complicate coexistences are invited into the ABD-rotor system compared to the case with idealized symmetric bearing supports. The findings in this paper yield important insights for researchers wishing to utilize automatic balancing devices in more practical rotor systems mounted on a asymmetric general bearing support.

Copyright (c) 2017 by ASME
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