What is 1X and 2x in vibration?
‘1x’ represents the shaft turning speed. For example, if the rotor rotates at 1000 RPM then ‘1x’ will be 1000. Similarly ‘2x’ will 2000 RPM (two times the shaft turning speed), ‘3x’ will be 3000 RPM (three times the shaft turning speed), and so on.
What is 1X in vibration analysis?
Vibration is any oscillatory motion caused by a restorative force. The most common vibration frequency is directly caused by this spinning shaft is dubbed fundamental shaft speed or running speed and is denoted as “1X vibration.”
What is 2x in vibration?
A 1X and 2X vibration signal predominant in the axial direction is generally the indicator of a misalignment between two coupled shafts. These signals may be also visible in the radial direction at a lower amplitude and in phase.
Why does 2x line frequency vibrate?
The magnetic flux produced by current-carrying conductors in AC machines alternates at line frequency (FL). Therefore all AC motors produce a 2 X line frequency vibration. In power systems that operate at 60 Hz, the vibration frequency is 120 Hz.
What is gE value of bearing?
As found. Overall bearing noise of 0.22 gE indicates good bearing condition. However, this high frequency signal was interfered by gear mesh frequency. Bearing noise measured in. Envelop G.
What causes high blade pass frequency?
High BPF can be generated if the wear ring seizes on the shaft or if welds fastening diffuesers fail. Also, high BPF can be caused by abrupt bends in linework (or duct), obstructions which disturb the flow path, or if the pump or fan rotor is positioned eccentrically within the housing.
What is main purpose of vibration analysis?
Vibration analysis is a process that monitors the levels and patterns of vibration signals within a component, machinery or structure, to detect abnormal vibration events and to evaluate the overall condition of the test object.
What causes horizontal vibration?
High horizontal readings are commonly associated with unbalance in the rotating elements. High axial readings generally indicate misalignment. The cause may be external, like coupling misalignment, or internal, like mechanical looseness or a bent shaft.
What does RMS mean in vibration?
Root Mean Square value
rms（Root Mean Square value） Root mean square value of the instantaneous values in a certain time duration. It relates to the power of the wave. The rms value of velocity is one of the important factors for machinery status diagnosis.
What are the 3 basic characteristics measured in vibration?
How far (amplitude or intensity), and how fast (frequency) the object moves helps determine its vibrational characteristics. The terms used to describe this movement are frequency, amplitude and acceleration.
What is twice line frequency?
The fundamental magnetic wave in accordance with expression (2) creates the radial electromagnetic force-wave with a frequency of 2fL(twice line frequency), which is a major source of vibration in the alternate current electrical machines at this frequency.