The characteristics of the rolling bearing fault characteristic frequency

What is a rolling bearing fault characteristic frequency? Rolling bearing fault characteristic frequency is bearing fault vibration frequency. There are four typical bearing fault characteristic frequency, respectively is: BPFO - Outer ring fault characteristic frequency; BPFI - Inner ring fault characteristic frequency; 巴斯夫- The fault characteristic frequency and FTF - roller Keep the fault characteristic frequency. The characteristics of the rolling bearing fault characteristic frequency 1, bearing failure frequency is different from other failure frequency; 2, rotating speed of bearing failure frequency is not the integer times frequency; 3, inner and outer ring fault frequency and frequency = 'rolling element bearings by frequency' ( Rolling element number X RPM) ； 4, bearing inner ring failure frequency are often accompanied by 1 X speed frequency sideband; 5, bearing outer ring fault frequency amplitude is higher than the bearing inner ring failure frequency amplitude; Six, bearing fault generally by the rolling element and cage failure before first came the inner ring or outer ring fault frequency; 7, bearing cage failure frequency ( “保障未来粮食供给”) Not usually appears in its fundamental frequency; 8, when rolling body itself fails, tends to produce not only failure frequency (roller BSF) , and maintains a failure frequency ( “保障未来粮食供给”) ； 9, bearing cage fracture, possible rotating roller failure frequency; 10, a rolling body has the fault, will produce a faulty rolling element number x roller fault characteristic frequency of frequency. If there is fault on five ball or roller, often there will be a 5 x BSF frequency; 11 and allows the vibration of the bearing fault frequency amplitude can't absolute limit. It is not only related to specific machines, rotational speed, also had a lot to do with bearing failure frequency transfer pathways. Refers to in bearing damage is one of the most obvious sign of bearing failure frequency of the harmonic frequency, especially the frequency at these frequencies associated with 1 x speed or other bearing failure frequency sideband, should replace the bearing as soon as possible. 12, evaluation of low speed bearing state machine: especially below 100 RPM speed of the machine bearing state, recommend gathering and the time domain waveform ( FFT) The spectrum of the two. When the speed is very low, rolling roller occurs through the defect in the bearing inner and outer ring of the pulse does not have enough energy to produce clear, can detect FFT spectrum in frequency, but can still see clearly in the time domain waveform. 13, vibration sensors placed as close to the bearing load bearing area, especially when bearing only support radial load. 14, inappropriate bearing load and installation problem if the bearing load is not appropriate or inappropriate, for example, installing a new bearing, if the bearing and the bearing seat interference fitted too tight, make bearing 'cut into the' bearing, bearing internal clearance changes, make mandatory pinned to the roller bearing inner and outer ring. Appear this kind of circumstance, bearing when starting an immediate failure frequency of bearing outer ring and inner ring. Put too much load due to improper installation of the bearing. Though, may not be actual damage occurs, but, if the fault cannot be detected problems and take steps to correct, then the bearing will be long before its scheduled life damage. 15 poor lubrication, bearing the frequency characteristics are within the scope of the 900 to 1600 hz, have 3 or 4 peak, the difference between the peak frequency in 80 to 130 hz. Good lubrication of the bearing may also include the frequency component, however, their amplitudes are very small, about 1. 27 MMN/s or less. When the poor lubrication, amplitude increases to 2. 54 to 5. 08mm/s。 Rolling bearing fault characteristic frequency