文档介绍：ARTICLE IN PRESS
Mechanical Systems
and
Signal Processing
Mechanical Systems and Signal Processing 18 (2004) 127–141
ate/jnlabr/ymssp
Adaptive time–frequency position for transient
vibration monitoring of rotating machinery
. Shia,*, F. Tsungb, . Unsworthc
a Institute of Vibration Engineering Research, Nanjing University of Aeronautics & Astronautics, Nanjing 210016,
People’s Republic of China
b Department of Industrial Engineering and Engineering Management, Hong Kong University of Science and Technology,
Hong Kong
c School of Engineering & Information Technology, University of Sussex Brighton, BN1 9QT UK
Received 22 October 2002; received in revised form 19 June 2003; accepted 24 June 2003
Abstract
Monitoring the vibration behaviour of large rotating machinery is an effective way to reduce production
losses and enhance safety, efficiency, reliability, availability and longevity in manufacturing processes. As
large rotating machinery is increasingly employed in continuous operations at high speeds and with heavy
loads, the vibration behaviour of the rotor systems is more and plex. Focusing on the defects of
different joint time–frequency representations, we present an adaptive time–frequency position
(ATFD) technique to describe transient vibration. This approach provides a precise interpretation of
complex signals that consist of various time–frequency structures through posing it into paramedic,
redundant and well-ponents in the time–frequency plane. puter simulation and an
actual case show that this technique has high time–frequency resolution and no interference terms. The
analysis results proved this approach could specify critical speed as well as acceleration rate accurately and
is very effective in ensuring machinery passing through critical speed field safely.
r 2003 Elsevier Ltd. All rights reserved.
1. Introduction
Large rotating machinery, such as steam turbines and pressors, is essential
equipment in oil