In the use of vibration on the diagnosis of rolling bearings of simple process, usually to the measurement of vibration value (peak, RMS, etc) and the criteria to judge a preliminary comparison, according to the measured vibration value is beyond the standard given to judge whether the boundaries of bearing had problems, to decide whether or not it needs further accurate diagnosis. Therefore, it is very important criteria to judge.

For simple diagnosis of rolling bearing the judgment standard can be divided into three kinds:

(1) the absolute decision criteria: is used to judge the measured vibration value is the absolute overrun quantity.

(2) the relative decision criteria: is the same part of the bearing regular vibration measurement, and according to the time has more to bearing trouble-free of vibration of the value for the standard, according to the measured vibration value and the benchmark of vibration value than diagnosis standard.

(3) analogy decision criteria: is the same type of bearing several years in the same conditions in the same parts of the measured vibration, and vibration value compared each other for standard of judgment.

Absolute decision criteria is stipulated in the measurement method based on the standard of set, NACHI bearing so must pay attention to the applicable frequency range, and must be in a specified way of vibration measurement. Apply to all of the criteria to judge is absolutely bearing don't exist, so are generally absolute decision criteria, relative most determinant standard and analogy decision criteria, so that we can get accurate, reliable diagnosis.

 
Vibration signal amplitude values including simple diagnosis method, wave factor diagnosis, probability density diagnosis and kurtosis coefficients diagnostics.
 



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