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Vibration
Analysis Programs
help find problems before
catastrophic breakdowns occur, it
offers many clear-cut advantages. They include:  Dramatic
reductions in the high cost of unplanned downtime;
PRINCIPLES
OF VIBRATION ANALYSIS VIBRATION
ANALYSIS Every machine fault whether it’s mechanical or electrical in nature generates vibration at a frequency equal to shaft rotation speed. This
is because the heavy spot of the unbalanced rotor passes the vibration sensor
once per shaft revolution. Similarly,
frequencies can be calculated corresponding to many other common machine faults:
(A spectrum is a calculated data display of frequency versus amplitude. The
frequency helps diagnose the
source of
the vibration, while the amplitude helps determine the
severity
of the problem.) Vibration troubleshooting Vibration troubleshooting is routinely applied to rotating and reciprocating equipment to assess general mechanical health. Bearing, motor, gearbox, driveline and foundation problems can be easily identified prior to becoming an operational problem. Vibration sensors are mounted to the structure. Dynamic data are acquired to determine the machine's operational characteristics. This also identifies if resonances are affecting any of the vibration components. If resonances exist, frequency response testing and modal analysis are conducted. If resonances are not contributory, operational deflection shape analysis is performed to reveal the structure's pattern of deformation. Rotating equipment analysis is another vibration monitoring tool used to assess the general mechanical health of rotating and reciprocating machinery. Rotating equipment diagnostics identifies rotor imbalance, mechanical looseness, bearing defects, motor mechanical and electrical problems, shaft misalignment, gearing faults, and foundation problems. Operational deflection shape analysis is used to determine the structure's forced vibration shape. Employed techniques also identify if detrimental resonances exist in the equipment, support structure, or foundation. Modal analysis can then be used to visualize the associated patterns of structural deformation.
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