02—Synchronous vibration, the difference between asynchronous vibration
Synchronous vibration Asynchronous vibration
Synchronous vibration refers to the frequency of the rotational frequency and frequency components of the vibration changes. Under normal circumstances (but not all cases), the synchronization components are integer multiples or integer multiples of the rotational frequency, and they always maintain this relationship regardless of rotational speed, such as 1X, 2X, (3X) "", half-frequency (1 / 2X), one-third times the frequency (1 / 3X) "" and so on. Asynchronous vibration refers to the frequency of the vibration frequency has nothing to do with the speed, also known as asynchronous motion.
03—Relative axis vibration, absolute axis vibration, bearing vibration
Relative axis, absolute shaft, bearing seat
The relative shaft vibration of the rotor refers to the vibration of the rotor shaft journal relative to the bearing housing. It is generally measured with a non-contact eddy current sensor. The absolute shaft vibration of the rotor refers to the vibration of the rotor shaft relative to the ground. It can be measured by a contact sensor or by a composite sensor consisting of a non-contact eddy-current sensor and an inertial sensor. Vibration of the rotor shaft with respect to the ground can be obtained by vector addition of the values measured by the two sensors. Bearing vibration refers to the bearing relative to the ground vibration, it can be used speed sensor or acceleration sensor to measure.
04—Harmonic, sub-harmonic, sub-asynchronous, super-asynchronous
Harmonic, sub-harmonic, sub-asynchronous, super-asynchronous
Harmonic, sub-harmonic, sub-asynchronous, super-asynchronous A complex vibration signal contains a signal component that is an integral multiple of the rotation frequency, also known as harmonics, superharmonics, or synchronization. A complex vibration signal containing a frequency equal to a fraction of the rotational frequency of the signal component, also known as sub-harmonic or fractional harmonic. Sub-asynchronous vibration is a non-synchronous vibration component whose frequency is lower than the rotation frequency. Super-asynchronous vibration refers to the non-synchronous vibration component whose frequency is higher than the rotation frequency.
01—What is the high point and the focus
High and heavy
The high point refers to the angular position at any moment corresponding to the vibration sensor on the shaft when the distance between the shaft and the vibration sensor is the closest. It also means that when the vibration sensor generates a positive peak vibration signal, the position of the shaft surface vibration sensor corresponding to the point. The high point may move with changes in the rotor's dynamic characteristics (such as speed changes).
The focus is on the angular position of the unbalanced vector at a particular lateral position on the spindle. Focus generally do not change with the speed. At a certain speed, the angle between the key point and the high point is called the mechanical retard angle.
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