The rolling bearing fault diagnosis formula and meaning ( It is worth collecting)

Rolling bearing fault diagnosis formula: this formula is unknown at the scene of bearing parameters under the condition of diagnostic experience inner ring outer ring, roller characteristic frequency to keep in mind. Do have bearing fault, frequency composition is difficult to explain it hidden: to clear the four failure frequency. If we have continuous monitoring equipment, bearing failure early defect, usually appears in component failure frequency of the first, but if we only to a device of bearing fault diagnosis, often encounter a bunch of vibration frequency and its friction and impact, inner and outer race, and even keep comprehensive reflection of various frequency form. Look at the low frequency spectrum, explanation of non-synchronous see: first check with turning and times frequency synchronization frequency components, is neither a part of the overlap. If there is asynchronous components, fault has three points can be explained: if you have to turn the frequency and the frequency doubling sync frequency components, are likely to be bearing failure frequency. Corresponding fault characteristic frequency harmonic, no doubt asked to explain: if the synchronous frequency components and some wave components, basic can tell is bearing failure frequency. Then look at high frequency, frequency spectrum modulation exist fault explanation: at high frequencies when we have with asynchronous frequency as the sideband modulation phenomenon, can be concluded that the bearing failure. Outer characteristic frequency adjustable, loose phenomenon without question: if the outer ring fault frequency by frequency modulation, which bring the sideband frequency, there should be a outer looseness fault. Outer ring local fault, such as pitting, horizontal grain may appear only outer ring by frequency, loose as to display for the outer ring is not very understanding, bearing outer ring is loose, belong to the problem of clearance and rigidity, is often accompanied by frequency harmonic frequency. Inner ring fault frequency adjustable, can also explain evidence composition: the inner ring fault frequency will also receive frequency modulation. Also most of the time will not be modulation, especially for single partial defect: special condition, special diagnosis fault measured if there is a single frequency, whether or not bearing need to identify the explanation: if there is a single asynchronous frequency, no harmonic and modulation phenomenon, is likely to be jamming signals or other, generally not bearing failure frequency. In fact many more single by frequency of partial failure to components, but this kind of failure is often not too serious.     High frequency is also very important, early failure lf there is no high frequency high frequency points, and constantly tracking be diligent to explain: this sentence said of good, otherwise you will not find anything apart bearing damage if it is a very serious, high frequency up the hole in a timely manner to replace mo fluke, moment to avoid accident explanation: early failure generally in low frequency band is hard to find, but in generally characterized by high frequency modulation phenomenon, more careful. Grasp the qing fault mechanism, to clear the lubrication condition testing, considering there are tricks debugging assembly mo relax in the diagnosis of bearing, believe that science is not wrong in the gear box experience summary 1 rolling bearing fault diagnosis, clear internal structure and gear box bearing fault characteristic for gear box structure, such as what kind of pattern, the transmission shaft gear several, what are the bearings on each shaft and what type of bearing. Know what shaft and gear are high overloading, can determine the measuring point arrangement; Know the number of teeth on the motor speed and the transmission gears, transmission ratio, can determine the mesh frequency, frequency of each transmission shaft. Know the bearing model of rolling bearing, various bearing fault characteristic frequency can be determined. The other need to know the characteristics of bearing fault, turn gear gear mesh frequency is the number and frequency of integer times, frequency and the bearing fault characteristic frequency is not transform integer times. 2, as far as possible in each transmission shaft in the bearing on the measured vibration in gear box shell on different positions of measuring points, because the signal transmission path is different, so the response to the same incentives also differ, transmission shaft in the bearing place of vibration response is sensitive, should set up the monitoring stations, here in the shell of the upper is near the gear meshing point, facilitate the monitoring of other gear fault. 3, as far as possible from the horizontal, vertical and axial direction to measure the vibration is not necessarily all position must carry on the three directions of vibration measurement, but must do so, important parts of the same station more groups of vibration data can also analyze and judge where the shaft speed to provide enough data for reference, and for which the further diagnosis of bearing failure to be more serious and get more reference. 4, give attention to both high and low frequency vibration in the gearbox vibration signal contains natural frequency, frequency of the rotation of the shaft, gear meshing frequency, bearing fault characteristic frequency, frequency composition such as, its frequency band is wide. For the monitoring and diagnosis, generally according to frequency band classification, according to the different frequency range to choose corresponding measuring range and sensor. 5, best gear at full capacity in a state of vibration under the full measurement of gear box vibration, can be more clearly capture the fault signal. 6, relating to both spectrum analysis data in figure in the gear box failure, learn UG programming to receive information on the group of 610677581 spectrum diagram can help you sometimes the failure characteristics of vibration amplitude, great changes have taken place not impossible to judge fault or the severity of the drive shaft rotation speed is correct, so need to combine vibration spectrum chart and time domain chart both inference. 7, pay attention to the analysis of side band frequency for low speed, large equipment rigidity, when the gear box bearing wear, often bearing fault characteristic frequency of the vibration amplitude is not large, but with the development of bearing wear faults, may appear in large Numbers of bearing fault characteristic frequency harmonic, and side band, at this time, show that the serious fault of the bearings, need to be replaced in a timely manner.