What is 1x and 2X vibration?

What is 1x and 2X vibration?

A 1X and 2X vibration signal predominant in the axial direction is generally the indicator of a misalignment between two coupled shafts.

What is 2X line frequency?

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 subsynchronous vibration?

Sub-synchronous vibrations occur at frequency less than the rotational frequency. Below is an animated graphic showing a simple sub-synchronous orbit. The key phasor line shows that rotor rises to a peak after two rotations. When these vibrations are combined, you get the following pattern.

What is 2x in vibration analysis?

This means vibrations in 2 axis. It means that there are variable forces that cause vibrations being applied on a body in 2 axises. For example, if you are traveling in a car on an ideally smooth road, there are no vertical (z-axis) vibrations.

What is the difference between critical speed and whirling speed?

Whirling speed or Critical speed of a shaft is defined as the speed at which a rotating shaft will tend to vibrate violently in the transverse direction if the shaft rotates in the horizontal direction. In other words, the whirling or critical speed is the speed at which resonance occurs.

What is line frequency of a motor?

As a result of this, induction motors will always have a slip frequency, which is the difference between the speed of the rotating magnetic field and the actual rotating speed of the rotor. For example, the rotating speed of the magnetic field in a 2-pole motor is exactly AC line frequency (50 Hz) or 3000 cpm.

What is 2xLF?

The 2xLF is actually a “torque pulse” frequency. When there is an electromagnetic problem, it will affect the torque. Torque produces a twisting action in motor.

What is SSR phenomenon?

Synchronous Resonance (SSR) is a phenomenon in which electrical energy is exchanged between generators and transmission systems below power frequency. It can be caused due to interaction of a series compensated transmission line with a generator; in addition, results in oscillation in the shaft and power swing.

What is synchronous frequency vibration?

Any vibration that occurs at the 1X frequency, or a whole number multiple of it is referred to as a synchronous vibration. Any vibration that is greater than the 1X frequency, but is not a whole number multiple of it is called a non-synchronous vibration.

What causes 1x vibration?

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.” This vibration can be caused by many conditions, but among the most common is unbalance. Unbalance occurs when the rotor has a heavy spot.