Gearboxes with rolling element or fluid film bearings and
belt and chain drives
Bladed machines including pump impellers, fans, and
turbines
Electromagnetic systems of electric machines
In each type of unit listed above, DREAM® can find up to
fourteen different defect types with the severity of each defect. Based on the
defect identification, it can forecast the minimum safe operating period of the
machine for periods of up to six months.
2. Detected defects:
Rotor assembly and operational defects:
unbalance
wobbling
jointed coupling defects
soft foot
support defects
Rolling element bearing installation and wear defects:
revolution around outer race
nonuniform radial tension
outer race misalignment
wear of outer race
cavities, cracks on outer race
wear of inner race
cavities, cracks on inner race
wear of cage and rolling elements
cavities, cracks on rolling elements
defects of several friction surfaces
slip of race
lubrication defects
Fluid film bearing installation and wear defects:
shaft wobbling (revolution)
liner misalignment
wear of liner
self-sustaining rotor oscillations
shocks in the bearing
lubrication defects
Gearbox assembly and operational defects:
gear wheel wobbling (misalignment)
wear (cracks) of gear teeth
defects of interaction between gears
Defects of impeller or bladed wheel assemblies:
wobbling,
blades defects (wear, crack, resonance),
increased turbulence of flow in the working wheel
zone,
cavitation in liquid
AC machinery defects:
rotor windings and active iron defects (open/short
circuits)
stator windings and active iron defects (open/short
circuits)
static eccentricity of air gap
dynamic eccentricity of air gap
power supply defects (mains supply)
3. Measurement points:
On the machine case or on bearing housings
4. Types of spectra required for diagnostics:
Narrow band autospectra measured according determined by
DREAM® from the machine specifications
Narrow band envelope spectra selected by 1/3 or 1/1 octave
band pass filters determined by DREAM® from the machine specifications
5. Defect levels
Levels for severe defects are recommended by the system
according to the machine data, but can be adjusted by the user.
Levels for medium and incipient defects are based on the
levels for severe defects.
Levels for severe defects can be adjusted by the customer
any time after he gets experience in diagnostics and visual inspection of
the defective units.
6. Condition Based Maintenance and Works Planning
An automatic long-term condition forecast is presented in
terms of the date of the next measurement. This is a forecast safe operation
period for each of the machine units in cases where no dangerous defects or
defect combinations are found.
Issuance of recommendations for the maintenance, repair or
other corrective actions to be made after the detection of dangerous defects
or those installation defects that decrease the machine service life;
Each particular defect development rate is taken into
account together with possible combinations of defects during the
calculation of the forecast of the safe operation period for the machine;
Short-term condition forecasts taking into account trends
for developed severe defects after they reach a dangerous stage;
Automatic planning of the next measurements taking into
account the diagnosed condition of the machine and its forecast.
7. Diagnostic Results Analysis and Presentation
Lists of the diagnostics results and maintenance
recommendations;
Graphical and text presentation of the diagnostic process
with the symptoms for each defects found;
Graphic analysis of all measured spectra with all
characteristic frequencies displayed, advanced cursor functions, etc.;
Graphic analysis of trends for certain defects and
spectrum components;
Reports on diagnostics of machine groups, units, groups of
units.
8. Reporting
Automatic generation of reports of diagnostics and
recommendations for maintenance for each of machine unit, machine or group
of machines;
Automatic generation of route maps for measurements and
corresponding reports;
Automatic generation of reports on measurement setups
required for diagnostics.
9. User interface
Windows 95 or Windows NT compatible;
Easy navigation through equipment tree;
Display of photographic images pictures of your machinery
and plant.
Intensive mouse operation. All major commands are accessed from a local
context sensitive menu by a single mouse click.
