Analysis Of Vibrations For Detecting
Cracks In Gears
Author(s)
A. Belsak & J. Flasker
Abstract
A crack in the tooth root, which often results in failure of gear unit operation, is
the least desirable among damages and faults, which can cause problems in gear
unit operation. A fatigue crack in the tooth root brings about important changes
in tooth stiffness, whereas other faults are usually associated with changes in
other dynamic parameters. In this paper, fault analyses relating to gear units with
real damages or faults are presented. Possible damage can be determined by
monitoring vibrations. Time signals acquired by experiments are analysed by
means of various methods. The Wavelets and Joint Time Frequency Analyses
are used to analyse non-stationary signals.
Keywords: gear, failure, vibration, signal analysis.
1 Introduction
The aim of maintenance is to keep a technical system (e.g. a gear-unit) in the
most suitable working condition; its purpose is to discover, to diagnose, to
foresee, to prevent and to eliminate damages. The purpose of diagnostics is to
define the current condition of the system, and the location, shape and reason of
the damage formation. A gear unit has elements that make transmission of
rotating movement possible, and as such, it is a complex dynamic model. In spite
of this, its movement is usually periodical, and faults and damages represent a
disturbing quantity or impulse, which is indicated by local and time changes in
vibration signals [1, 2]. As a result, time-frequency changes can be expected [3].
This idea is based on kinematics and operating characteristics.
It is possible, by using time-frequency analysis, to describe in what way
frequency components of non-stationary signals change with time as well as to
define their intensity. Adaptive and wavelet transforms are representatives of
Keywords
gear, failure, vibration, signal analysis
Related Book
Other papers in this volume
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