Hazard Rate Diagnosis of Heavy Earth Moving Machinery using 2-parameter Weibull Analysis

Abstract

Abstract: Hazard rate is a parameter of importance for
understanding the machine completely. If a machine could
perform to its full potential it has to go through a series of welldefined maintenance policies along with supervision and care.
However, the performance of a machine alters based on the
time as defined by the bath tub curve. It is a property by law.
Hence a fixed way of familiarization may not hold good to
access and ascertain the performance of the machine. Thus, for
the machines in particular of heavy earth moving machinery
are to be emphasized for the hazard rate by a meticulous and
cumbersome method that can protect and prevent the machine
by analyzing its condition periodically. Weibull analysis is one
of the ways of such method that holds good to this purpose.
Apart from the many other methods, a 2-parameter weibull
analysis is an effective method to find the hazard rate of heavy
earth moving machinery (HEMM). The data of HEMM is
taken from the operating conditions of the machines in the
field. Usually the HEMM are subjected to many number of
failures, sometimes same failure may happen multiple of times.
The hazard rate lies in how vulnerable is the failure, as well as
what is the root cause for the failures. In practice it is also
found from the investigation the major components or parts
that are contributing the maximum portion for the failure of
the machinery. These findings are very essential for the
formulation of the suitable maintenance policy along with the
vital areas of the machinery for preventive actions. And also
the maintenance policies are different for the different periods
of machine operation. Hence the position of the machine in
bath tub curve is also found from the investigation. In order to
archive that the collected data is refined as per the
requirements for the assessment of the performance of HEMM,
Weibull analysis is an effective method for the assessment of
the reliability; availability and also the hazard rate. Machines
follow different failure distributions hence it is very important
to know the failure distribution of the HEMM. During the
investigation of the hazard rate the failure distribution of the
HEMM is calculated. In the present work the 2-parameter
weibull analysis, the scale and shape parameters are found and
based on the findings, the hazard rate of the HEMM is found,
also the position of the machine is obtained.
Index Terms: Hazard rate diagnosis, heavy earth moving
machinery, reliability, availability