Many methods of measuring bearing vibration, an electric measurement method, the mechanical and optical method, of which the most common is the electrical measuring method.
    By measuring Bearing Vibration can be divided into displacement, velocity and acceleration. Among them, suitable for measuring the low-frequency vibration displacement, velocity for measuring frequency vibration; acceleration is suitable for measuring high-frequency vibration. Displacement, velocity and acceleration between three parameters, can be derived mathematical differential or integral with each other, but by integrating the acceleration
Access speed and displacement error is small, and the differential speed of the displacement or the errors.
    Manifests itself in the vibration of the bearing, high-frequency vibration, the measurement of bearing vibration for the physical quantity used is the speed and acceleration. Which measure acceleration, generally with full band, ie 50-10000 Hz. 3-band can also be used to measure speed, generally use three frequency bands, may also have full band. 3-band corresponds to the generation of manufacturing precision bearing vibration is the main factor: 50 ~ 300 Hz: ring raceway roundness 300 - 1 800 Hz, ring raceway waviness, rolling roundness; a 800-10 000 Hz ring raceway and rolling surface roughness.
  Measuring bearing vibration acceleration, although there are many advantages, such as the commonly used piezoelectric accelerometer bandwidth, high sensitivity, the system error is small, good reliability, smaller and lighter weight, the most widely used and so on, but the basic measure vibration the Chinese and high frequency components determined in the low frequency vibration values vary greatly even within easy also reflected.
  Measuring bearing vibration velocity, although some deficiencies, such as the commonly used electric speedometer generally limited amplitude and frequency, susceptible to strong currents and strong magnetic field interference, larger and heavier, etc., but the measured vibration values relatively stable, at overall vibration level can reflect any change in vibration level in the band, it is possible to objectively evaluate the quality of the vibration, the use of a 3-band vibration measurement can increase the amount of information.
  Given the above measure vibration velocity and acceleration comparison between the pros and cons, bearing vibration measurement has become increasingly tend to use speed, especially the first four International Organization for Standardization Technical Committee (Rolling Technology Committee) ISO/TC4 released in 2004 iS015424 " bearing vibration measurement method ", which clearly defines the towel bearing vibration measurement is speed, the more should be the cornerstone of its preferred position.


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