What is 1x 2X in vibration analysis?

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.

What is 2X line frequency vibration?

Since AC power is supplied as a sinusoid, each pole of the motor is energized twice – once with a “+” peak and once with a “-” peak – during each cycle. This means that the most common vibration frequency that is generated is NOT line frequency – it is 2x line frequency.

What is gE in vibration analysis?

An example of the analyses that can be undertaken remotely include the aforementioned acceleration enveloping (gE). This is a particularly useful analysis technique for vibrating screens.

What is GS value in vibration?

Vibration is the movement or mechanical oscillation about an equilibrium position of a machine or component. Vibration can be expressed in metric units (m/s2) or units of gravitational constant “g,” where 1 g = 9.81 m/s2.

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 is pole pass frequency?

This implies that any given rotor bar is passed by all of the magnetic poles in one rotation of the slip frequency. The rate at which this occurs is termed the FP. Often in vibration analysis the term for this is called the motor pole passing frequency (PPF). (PPF = motor slip X number of poles).

What is meant by line frequency?

Definition of line frequency : the number of lines scanned per second by the sawtooth wave of current used in television for horizontal scanning with an electron beam — compare frame frequency.

What is RMS value of vibration?

Root Mean Square Amplitude (RMS) is the square root of the averageof the squared values of the waveform. In the case of the sine wave, the RMS value is 0.707 times the peak value, but this is only true in the case of the sine wave. The RMS value of a vibration signal is an important measure of its amplitude.

What is G value in vibration?

What is vibration? Vibration is the movement or mechanical oscillation about an equilibrium position of a machine or component. Vibration can be expressed in metric units (m/s2) or units of gravitational constant “g,” where 1 g = 9.81 m/s2. An object can vibrate in two ways: free vibration and forced vibration.

What is spectrum in vibration analysis?

A vibration FFT (Fast Fourier Transform) spectrum is an incredibly useful tool for machinery vibration analysis. FFT spectra allow us to analyze vibration amplitudes at various component frequencies on the FFT spectrum. In this way, we can identify and track vibration occurring at specific frequencies.

What is PSD g2 Hz?

In vibration analysis, PSD stands for the power spectral density of a signal. For example, for a signal with an acceleration measurement in unit G, the PSD units are G2/Hz.

What is the meaning of 1X in vibration spectrum?

1X means frequency at which the machine(To be precise shaft) rotates or simply 1 multiplied by turning speed. example- If 1480 is the rpm,then 24.66HZ is marked as 1X in vibration spectrum .

What does “1x” mean?

The expression “1x” means vibration at the same frequency as the running speed of the machine. If a machine runs at 1789 rpm, the 1x vibration would be at 1789 cpm.

What does 1x and 2x vibration signal in axial direction indicate?

A 1X and 2X vibration signal predominant in the axial direction is generally the indicator of a misalignment between two coupled shafts. Axial 10 ©2011 PRÜFTECHNIK Condition Monitoring – Machinery Fault Diagnosis.

What does 1 x rpm mean in vibration monitoring?

In the context of vibration monitoring, 1 x rpm means a vibration frequency that is the same as the rotation speed (one vibration oscillation per revolution of the rotor), 2 x rpm means a frequency 2 x the rpm (two oscillations per revolution), etc.