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Noise emitted from just run EDA bearing raceway, with speed increasing disappeared. Oil free bearing operation sometimes also noise may be because the bearing lubrication and installation does not do well.
Impact sound and its control method of rolling large models of ball EDA bearings under purely radial load and low speed operation, due to the centrifugal force of the rolling small, in the non load rolling will impact the holder or rolling road noise. But with the increase of rotational speed, the noise will disappear.
On the rolling control method for impact sound: appropriate reduction of radial clearance, the use of reasonable structure and materials have the soft cage of EDA bearings.
EDA bearing raceway acoustic raceway and its control method is when no oil bearing operation, the rolling element rolling and making a slippery continuous sound in the raceway surface, is a basic sound all rolling bearings are unique to happen. Bearings generally sound is rolling road sound with other sounds. Ball bearing raceway is irregular, frequencies above 1000Hz, the frequency rate does not change with the speed, but its sound pressure level increases with acceleration of the speed. Raceway bearing large, the raceway acoustic sound pressure level decreases with the increase in viscosity of the rolling bearing; but say small, the sound pressure level in the viscosity increases to about 20mm2/s above, by a reduction to increase. The bearing seat more rigid, roller acoustic sound pressure level is low. Such as the radial clearance is too small, raceway acoustic sound pressure level and frequency with reduced radial clearance and increased dramatically.
Control of raceway acoustic methods are: selection of low noise EDA bearings oil free bearing which waviness small, carefully select the use conditions. Rolling road sound often affects the entire mechanical noise, reduce the raceway can reduce the noise of the whole machine.
(1) select low noise EDA bearings; it depends on the bearing to buy high quality, the general good of the bearings are made of high material of steel, with high density, high tolerance;

(2) non oil bearing application link to eliminate noise, is part of the above add lubricating grease, must choose good lubricating materials, can play a multiplier effect;
(3) avoid resonance with the host, to avoid the resonance sensitive speed; this needs professional installation and debugging, can avoid the resonance problem;
(4) if the invalid in the other method, to take additional measures for noise and noise control, sound control equipment installation etc.,
A creak and control method of bearings creak metal friction sound EDA bearing can happen on all occasions of harsh, mostly in the larger models grease lubricated bearings, the grease base oil on the performance degradation in more easily, almost does not occur under oil lubrication. In addition, more vulnerable in the winter, when under purely radial load, prone to big occasions in a radial clearance, and with different model sizes, easy to occur within a specific speed range, both continuous and intermittent. The outer ring raceway special processing methods can prevent creak appears, when necessary, can choose this kind of bearing, or appropriate reduction of radial clearance of oil-free bearings, using high performance greases and improve the rigidity of bearing matching parts.