The acceleration of the tally standard rolling bearings

The acceleration of the tally standard 2020 - rolling bearings 02 - 22 peng beg flourishing machinery vibration intensity and amplitude can be expressed in displacement, velocity and acceleration. Has shown, moreover, most of the equipment failure is the result of the component fatigue, vibration velocity is the direct measurement of vibration fatigue, and, in fact, the vast majority of mechanical vibration standards are based on the vibration velocity. At this point, there will be an obvious question: 'why do you want to measure the displacement and acceleration? 'the answer is very simple, although most of the equipment failure is directly related to vibration velocity of the result of fatigue, but there are two other reasons can cause equipment failure: the stress and strength, respectively related to the vibration displacement and acceleration. The following focuses on the occasion of the mechanical fault vibration acceleration testing. A, the occasion of the mechanical fault vibration acceleration testing stress and the displacement relationship and the relationship between fatigue and vibration velocity is very simple and intuitive. Maybe that works for the cause of the problem in a simple way is to use hammer objects, shock may not produce a lot of migration or vibration velocity, however, the damage may be quite large. The textbooks we've learned shows that force equals mass times acceleration, F = M× 一) 。 According to this formula, obviously, vibration acceleration and force is directly proportional to the. Because of the increase of vibration acceleration and vibration frequency is proportional to the square of the, so, can produce a lot of high frequency vibration exciting force, although at that time the displacement and velocity can be quite small. Too much force will usually make parts surface deformation, acceleration value rise, for rolling bearing, generally indicates the generation of fatigue. Early bearing fatigue, may be especially obvious on the velocity or displacement and no performance, along with the development of fatigue, bearing vibration velocity peak value will significantly increase ( While vibration displacement may not always have more obvious with the increase of) And when the acceleration of more than a certain value, is the best of the timing of the repair replacement bearings; For friction problem, especially in the unstable friction problem, due to the impact of the unstable signal, generally can also cause the rise of acceleration and wave, for rotating equipment with simple structure, this kind of problem often appeared on the bearing lubrication. Since the acceleration is so important, for on-site check personnel, are there any standards, as far as I know, acceleration and there is no international and national standards, but there are some diagnostic services company set standard of rolling bearing, as shown in figure 1. Figure 1 rolling bearing using this standard some notes: 1) Using this standard, shall be based on ( Speed & times; Rotor shaft neck diameter) The product and the bearing of the measured acceleration value to determine the bearing condition. 2) The standard is divided into three levels: the bearing states (a. Good) B ( Note) C ( Dangerous) 。 3) Using acceleration measurement parameters. Each device has a difference, even if the same two devices, due to its operating environment and other factors, the same bearing fault, the damage degree of the same, but its acceleration value will be very different. But at least we can early found the problem, the problem of tracking, to master the development situation of defects. The vibration of the concrete, using our simple table three measuring vibration velocity, displacement, acceleration value, if the velocity and displacement is small, the acceleration is larger, compared with the other bearing acceleration value at the same time, the acceleration value of the bearing is obviously prominent, high-frequency signal (the bearing are High frequency signal is one of the major characteristics of attenuated fast, not easy to transfer to other bearing) , especially for the transmission of multiple bearing effect is obvious. It is worth noting that the bearing high acceleration value does not mean that bearing damage, for some bearings because from the installation start this kind of phenomenon, especially the newly installed bearing, mainly to see trends; Other bearing lubrication problems caused by acceleration value phenomenon is widespread, the distinguish method is to inject new lubricating oil, observe change of the vibration. With personal experience, the pure acceleration value is high, even if is bearing, also need not nervous, you can track, different fault development trend is different, its development process can be very slow. Only when the frequency of vibration velocity values also gradually rise, show that the bearing should be ready to change. （ Source: the coalification run dry quenching technology exchange learning platform)