Affiliations: Faculty of Engineering, Memorial University, St.
John's, NL, Canada | Faculty of Engineering, Tarbiat Modares University,
Tehran, Iran
Note: [] Corresponding author: Ahmad Ghasemloonia, Box #60, Faculty of
Engineering and Applied Science, Memorial University of Newfoundland, St.
John's, NL, Canada A1B 3X5. Tel.: +1 709 7495027; E-mail:
a.ghasemloonia@mun.ca
Abstract: The role of gears in industry for speed and torque variation
purposes is obvious. The gearbox diagnostic methods have been improved quickly
in recent years. In this paper, two of the newest methods, the resonance
demodulation technique (R.D), and the instantaneous power spectrum technique
(IPS) are applied to gearbox vibration signals and their capabilities in fault
detection are compared. Yet, the important role of time averaging should not be
dispensed with, as it is the primary step for both techniques. In the present
study, the mathematical method of these techniques, according to the
mathematical vibration model of gears, is introduced, these techniques are
applied to the test rig data, and finally the results of both methods are
compared. The results indicate that in each method, the location of fault can
be estimated and it is located in the same angular position in both methods.
The IPS method is applicable to severe faults, whereas the resonance
demodulation technique is a simple tool to recognize the fault at each severity
and at the early stages of fault generation.
