On the Mechanical Systems Processed by Infrared
Thermography Combined with Wavelet Transform
Professor Vincenzo Niola
Department of Mechanical Engineering for Energetics
University of Naples Federico II
Via Claudio 21, 80125 Naples
Abstract: The industrial plants are continuously
monitored in order to maximize the performance, in terms
of quality and productivity.
Nowadays, the study is also steered to their capability
of working without any interruption or, at least,
without unwanted interruptions.
One can easily understand that this aspect of the
research is synergistic to the previous one because the
reduction of unproductive time of machines increases the
time available for production.
The predictive maintenance is based on methods and
techniques which are still evolving rapidly, even on a
consolidated basis; the approach to the evaluation of
economic benefit deriving from its application deserves
a particular attention.
The results achieved by the application of infrared
thermography (IT) encourages for monitoring mechanical
systems. In fact, it provides a complete representation
of effective working conditions, putting out of sudden
failures and allowing better planning of any technical
The measurement of radiation emitted from any kind of
material, equipment or plant, performed by using IT,
provides the corresponding heat map. The analysis of
surface thermal fields allows to detect fractures and /
or anomalies that may occur during the working process.
In fact, every worn or not properly lubricated mechanism
tends to overheat before reaching the fault.
A thermographic survey can identify such overheating
since its onset and the related thermal assessment
should provide the alarm before the fault occurs.
The observation of the images as well as the evolution
of raw data does not provide any information on possible
anomalies connected to the monitored object. Therefore,
it is quite evident that the thermographic analysis, by
itself, does not provide sufficient evidence to predict
any anomalies related to the observed system. Then,
starting from this sequence of data it is already
possible to obtain interesting information by applying
the Wavelet Transform both to thermographic images and
to numerical vectorial sequence. In particular, it is
possible to evaluate and to take out the information
characterizing the pattern of the signal as well as
morphological features and mean dynamics, related to the
Brief Biography of the Speaker:
Vincenzo Niola is professor of Applied Mechanics at
Naples University Federico II since 31 march 1987. After
he got an Univerisity Degree in Mechanical Engineering,
he started in january 1978 didactics activity as helper
at course of Applied Mechanics and Machines et as member
of their committee of examination. Since september 1979
he carried on that collaboration as owner of a
scholarship from C.N.R. (National Research Council).
Since december 1981 to march 1987 he was a researcher
carrying on the practice course for Applied Mechanics,
taking a part at examination meeting and working as
proposer in many degree thesis. Since 1981 to 1984 he
carried on his didactics activity as university teacher
for Bioengineering course of locomotive apparatus at
Orthopaedy and Traumathology specialization school of
2th Department of Medicine and Surgery of Naples
University. Since 31 March 1987 is professor of Applied
Mechanics at Naples University Federico II, and since
A.A. 86/87 to A.A. 92/93 he carried on the Applied
Mechanics and Machines course for electronic engineers,
and since A.A. 93/94 to today carry on the Applied
Mechanics course for computer science engineers. Since
A.A. 88/89 to 89/90 he carried on as supply teacher the
Applied Mechanics course for building engineers at
Salerno Engineering University. By A.A. 94/95 to A.A.
97/98 he carried on as supply professor Tribology course
at Naples University Federico II. By A.A. 2001/2002 he
holds the chair of Applied Mechanics for University
Degree of "Orthopaedic Technician" at 2th Department of
Medicine and Surgery of Naples University. Since A.A.
2005/2006 is professor of Tribology and of Complements
of Mechanics. During this years Prof. Vincenzo Niola has
been the chairman of his courses examination meetings,
and was proposer of many degree thesis.. During his
activity Prof. Vincenzo Niola was owner of financings
from MURST and (in past and present) cooperate
scientifically with research corporation and national
industries (MERISINTER, MONTEFLUOS, INDESIT, ALENIA,
C.I.R.A.). He's scientific member of Naples research
unit for PRIN 2003. He's fellow of Italian Association
of Theoretical and Applied Mechanics (AIMETA). He's
member of IFToMM Linkages on cams committee. He belongs
to the International Scientific Committee of the "World
Scientific and Engineering Academy and Society (WSEAS).
He is President of the WSEAS Italy Chapter on the
"Analysis of the Mechanical Systems". He was been
Chairman and "invited author" in some session of
Internatinal Conferences. He's author of more than 130
national and international papers.