17-08-2012, 03:45 PM
Condition Monitoring of Axial Piston Pump
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Abstract
Condition Monitoring is an area that has seen substantial growth in the last few
decades. The purpose for implementing condition monitoring in industry is to increase
productivity, decrease maintenance costs and increase safety. Therefore, condition
monitoring can be used not only for planning maintenance but also for allowing the
selection of the most efficient equipment to minimize operating costs.
Hydraulic systems are widely used in industry, aerospace and agriculture and are
becoming more complex in construction and in function. Reliability of the systems must
be supported by an efficient maintenance scheme. Due to component wear or failure,
some system parameters may change causing abnormal behaviour in each component or
in the overall circuit. Research in this area has been substantial, and includes specialized
studies on artificial fault simulation at the University of Saskatchewan.
In this research, an axial pump was the focus of the study. In an axial piston
pump, wear between the various faces of components can occur in many parts of the unit.
As a consequence, leakage can occur in locations such as between the valve plate and
barrel, the drive shaft and oil wiper, the control piston and piston guide, and the swash
plate and slippers. In this study, wear (and hence leakage) between the pistons and
cylinder bores in the barrel was of interest. Researchers at the University of
Saskatchewan, as well as at other research institutions, have been involved in studies to
detect wear in pumps using a variety of condition monitoring algorithms. However, to
verify the reliability and indeed, limitations of some of the approaches, it is necessary to
test the algorithms on systems with “real” leakage. To introduce actual wear in the piston
of pumps can be very difficult and very expensive. Hence, introducing piston wear in an
“artificial” manner would be of great benefit in the evaluation of various condition
monitoring techniques.
Introduction
Condition monitoring is an area that has seen substantial growth in the last few
decades. As a simple definition, condition monitoring is an approach which can be used
to gain information on the “health” of components or systems. Condition monitoring
includes not only fault detection and fault diagnosis, but also fault analysis. The purpose
for implementing condition monitoring in industry is to increase productivity, decrease
maintenance costs and increase safety. Therefore, condition monitoring can be used not
only for planning maintenance, but also for allowing the selection of the most efficient
equipment to minimize operating costs. The final goal of a successful condition
monitoring scheme is to detect the presence of faults before a catastrophic event or
unscheduled shutdown occurs. Condition monitoring is a management tool which
provides information about the likely future performance, which is most suitable when
the failure mode is gradual and progressive.
Condition monitoring of hydraulic pumps
Many studies have been published during the past few decades on the topic of the
condition monitoring of individual hydraulic components and of complete systems.
Several techniques were used frequently in these studies. The following review will focus
on the condition monitoring research and associated analyzing techniques as applied to
hydraulic pumps which, as will be stated later, are the subject of this study.