What does 1X vibration mean?

What does 1X vibration mean?

Vibration is any oscillatory motion caused by a restorative force. Free vibration occurs when a bell is rung or a guitar string is plucked. ... 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 analysis?

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.

What is 2X line frequency vibration?

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. ... The pole pass frequency will appear as sidebands in the spectrum.

How do you read a vibration spectrum?

2:5911:04Vibration Analysis for beginners 4 (Vibration terms explanation, Route ...YouTubeStart of suggested clipEnd of suggested clipValue it is a pure view of the sensors total movement in time for other physical quantities it isMoreValue it is a pure view of the sensors total movement in time for other physical quantities it is their pure record of change over time the time waveform shows a short time sample of vibration.

What is vibration limit?

For continuous long-term vibration, 10 mm/s peak vibration velocity is seen as a safe limit for structural integrity in industrial buildings. ... Structural damage has been observed on members where the vibration velocity exceeds approx 20-40 mm/s.

What is FFT in vibration?

The fast Fourier transform (FFT) is an efficient algorithm used to compute a discrete Fourier transform (DFT). This Fourier transform outputs vibration amplitude as a function of frequency so that the analyzer can understand what is causing the vibration.

How do you calculate engine vibration?

Motor speed is simply a measurement of the revolutions per minute (RPM), while vibration frequency is expressed in Hertz (Hz) and is the number of vibrations per second. To convert from Hz to RPM we simply multiply by 60, as there are 60 seconds in every minute. Similarly, to convert from RPM to Hz we divide by 60.

What causes motor vibration?

Causes of Electric Motor Vibration Causes of motor vibration include, but are not limited to an electronic or mechanical imbalance, faulty gears, failed bearings, loose foundations, wear and tear or misalignment. Imbalances: An imbalance is like a weighted spot in the rotating component of a motor.

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.

What is vibration RMS?

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 does a 1x and 2x vibration signal mean?

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.

Which is high axial vibration at 1x or 3x?

The spectrum shows high axial vibration at 1X plus some 2X and 3X with 180° phase difference across the coupling in the axial direction. These signals may be also visible in the radial direction at a lower amplitude and in phase. 1X 2X 3X

What does 2x vibration in misaligned shaft mean?

The change in vibration equates to a change in voltage input into the analyzer. The FFT reports these 2 or 3 positive going peaks as 1X, 2X, and 3X shaft speed or orders in The FFT waveform. Sorry, I do not have an animation.

What's the difference between 2x and 3x frequency?

I am confused with the amplitude at 1x, 2x, 3x frequency. The 1x, 2x and 3x is the harmonic (or mutiples) of the original frequency, meaning that if the shaft is turning at 1500rpm, then 2x will be the amplitude at 3000rpm and 3x will be the amplitude at 4500rpm right?