0
Research Papers

Suppression of the Forward Rub in Rotating Machinery by an Asymmetrically Supported Guide

[+] Author and Article Information
Tsuyoshi Inoue

Department of Mechanical Science and Engineering, School of Engineering, Nagoya University, Nagoya 464-8603, Japaninoue@nuem.nagoya-u.ac.jp

Yukio Ishida

Department of Mechanical Science and Engineering, School of Engineering, Nagoya University, Nagoya 464-8603, Japan

Gao Fei

 Toyota Auto Body Co., Ltd., 100 Kanayama Ichiriyama-cho, Kariya, Aichi 448-8666, Japan

Hossain Md Zahid

Department of Mechanical and Chemical Engineering, Islamic University of Technology, Board Bazar, Gazipur-1704, Dhaka, Bangladesh

J. Vib. Acoust 133(2), 021005 (Mar 01, 2011) (9 pages) doi:10.1115/1.4002120 History: Received August 21, 2009; Revised April 16, 2010; Published March 01, 2011; Online March 01, 2011

In rotating machinery, rubbing occurs between the rotor and the stator, at the seal, between the rotor and the guide and between the rotor and the backup bearing. The backward rub or the partial impact vibration can be avoided by lubricating the contact surface sufficiently in order to decrease the friction. However, forward rub may still occur in such a case with a lubricated contact surface. Once such a forward rub occurs, it remains even if the rotational speed increases to much larger than the first bending critical speed and it is difficult to escape from this forward rubbing condition automatically. This paper proposes the suppression method of this forward rub by introducing the directional difference in the support stiffness of the guide or the backup bearing. The nonlinear theoretical analysis clarifies and explains the usefulness of the proposed method and it is also validated experimentally.

FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Topics: Bearings , Stiffness , Force , Rotors
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 10

Influences of the parameters on the threshold rotational speed for escaping from the forward rub: (a) influence of the ratio N, (b) Influence of the gap δ, (c) Influence of the stiffness kx, and (d) Influence of the friction μ

Grahic Jump Location
Figure 11

Experimental setup

Grahic Jump Location
Figure 12

Case of symmetric support of the backup bearing (gap=0.3 and kx=ky=11.256)

Grahic Jump Location
Figure 13

Case of asymmetric support of the backup bearing (gap=0.3, kx=1.876, and ky=9.38(N=5))

Grahic Jump Location
Figure 9

Maximum and minimum contact force for the ratio N at ω=1.4

Grahic Jump Location
Figure 8

Influence of the support spring coefficient kx, ky: (a) resonance curves of maximum amplitude, (b) phase diagram, (c) Campbell diagram, and (d) contact force

Grahic Jump Location
Figure 7

Time histories and orbit at ω=1.3, N=5: (a) displacement, (b) contact force, (c) phase, and (d) orbit of shaft, stator, and their relative displacement

Grahic Jump Location
Figure 6

Time histories and orbit at ω=1.3, N=1: (a) displacement, (b) contact force, (c) phase, and (d) orbit of shaft, stator, and their relative displacement

Grahic Jump Location
Figure 5

Forward rub vibration: (a) resonance curves of maximum amplitude, (b) phase diagram, (c) Campbell diagram, and (d) contact force

Grahic Jump Location
Figure 4

Contact forces of models (a) and (b)

Grahic Jump Location
Figure 3

Restoring and damping forces during contact

Grahic Jump Location
Figure 2

Two types of contact models

Grahic Jump Location
Figure 1

Physical model of rotor system

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In