6. The peculiarities of the software "DREAM for Windows".
The application software "Dream for Windows" includes many
diagnostic programs for separate machine units or group of such units. You call
these programs diagnostic modules. Name, please the main modules and give the
recommendation in what cases they could be used.
(The question was asked by the specialists of "Sevtransgas")
The question is answered by
Alexej V. Barkov:
Nowadays we have already designed over 15 diagnostic modules
including special modules for certain types of complex machines such as for
example two shaft aircraft engines with the between shaft rolling element
bearing. But the number of typical modules that in the most cases do not require
customizing is limited and today we have 12 of them. They are named according to
the name of a unit or group of units that they diagnose. The following modules
should be mentioned:
rolling element bearings
rolling element bearings on the shaft line
rolling element bearings in the gearing
rolling element bearings in the belt transmissions
fluid film bearings on the shaft line
fluid film bearings in the gearing
fluid film bearings in the belt (chain) transmissions
pump and hydroturbines impellers
turbine, compressor, blower and fan wheels
synchronous electric motors
direct current electric machines.
There are also general recommendations how to use certain
diagnostic modules. For example if it is necessary to diagnose a rolling element
bearing then the module is selected depending on what shaft it supports. If the
same shaft has a gearing wheel then it is recommended to use the module for
diagnostics of the rolling element bearings in the gearing. This not only
improves the certainty of rolling element bearing diagnostics but ensures also
the gearing wheels diagnostics. If there is a necessity to diagnose the bearing
together with a rotor and coupling but without gearing or belt transmission on
the diagnosed shaft, then it is recommended to use the rolling element bearings
on the shaft line module. The similar recommendation can be given for the fluid
bearing diagnostic module selection. The only distinction for the rolling
element bearings is that they provide the diagnostics of a separate bearing to
detect the mounting defects and hidden manufacturing defects in new machines.
This module uses only the most accurate diagnostic methods that do not work when
the bearing is already in the state of degradation. Meantime all the other
methods use both the accurate and course (energetic) methods of bearing and
other units, mounted together with the bearing on the same shaft, diagnostics.
The module of pump impellers, compressor wheels diagnostics is recommended to be
used when the case of the machine in the nearest distance from the face of the
impeller or wheel is accessible for vibration measurements. When the case is
covered with the thermal projection it is necessary to use special methods of
vibration measurements or to use individual diagnostic modules for diagnosis of
the impellers together with the bearings. For example, nowadays we adjust a
diagnostic module to diagnose a rotor with a group of rolling element bearings
that will be used for machines where there is no access to measure the vibration
of the rolling element bearings. Such types of motors include the turbines and
compressors for the car engines and gas pumping stations and the turbines used
in power industry.
The modules for electric motors diagnostics are used to detect the defects and
make the condition prediction of the magnetic system and mechanical units of the
rotor (armature). To diagnose the machine bearings you have to have the
diagnostic modules of the appropriate bearings.
The number of diagnostic modules designed continuously increases in their number
including the modules for the units of original construction and for the
machines that include not only rotating but also reciprocating units the work of
which makes the diagnostics of the rotating units more complicated.