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 Machinery Classification


 When evaluating machinery and equipment it is useful to know their classification range and group type. There are four machine groups and classification ranges recognized internationally (ISO 2372 and VDI 2056). The limits for vibration severity (mm/s) are shown in the Tables below:

GROUP K – Small Machinery up to 15KW (for example, production motors)
GROUP K – Small Machinery up to 15KW (for example, production motors)

GROUP M – Medium-sized Machinery up to 75KW (for example, electrical motors without special foundations)
GROUP M – Medium-sized Machinery up to 75KW (for example, electrical motors without special foundations)

GROUP G – Large Machinery on Heavy Foundations
GROUP G – Large Machinery on Heavy Foundations

GROUP T – Large Turbo Machinery on Special Foundations

GROUP T – Large Turbo Machinery on Special Foundations

Relative Sensitivity Table (ISO 2954)

Relative Sensitivity Table (ISO 2954)

Vibration: Vibration is an oscillation or repetitive motion of an object around an equilibrium position.

Displacement: Displacement is the peak-to-peak distance from a reference position, or equilibrium point, of an object under test. Peak to

Peak Amplitude: Peak –to-peak amplitude is the displacement of an object (see above). It can be thought of as the distance from the maximum positive deviation point to the maximum negative deviation point with respect to an object’s equilibrium position.

Velocity: Velocity is the rate of change of displacement. Velocity is measured in inches/second (mm/second) units.

Acceleration: Acceleration is the rate of change of velocity. Units of measure for Acceleration is feet per second squared (meters per second squared)

Peak Amplitude: Maximum deviation of an object from its equilibrium position.

RMS: Root Mean Square Amplitude (RMS) is the square root of the average of the squared values of a waveform. The RMS amplitude of vibration is 0.707 times the peak amplitude value The RMS value of a vibration signal is an important measure of its amplitude.



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