Bearing noise   originally come from the bearing structure itself, this kind of noise  can be divided into three types: raceway sound, rolling element impact sound, and rolling sound.

DAF Bearing analysis one of the these----Rolling Element Sound

DAF as a professional bearing manufacturer,it knows Bearing operation throughly,such as Bearing Noise. Now, let us get  the impact sound of rolling elements and its control method . When larger ball bearings or cylindrical roller bearings run at low speed under pure radial load, because the centrifugal force of the rolling elements is small, the rolling elements in the non-load area will impact the cage Or the raceway makes noise. But as the speed increases, this sound will disappear. The methods to control the impact sound of the rolling elements include: appropriately reducing the radial clearance, and using a bearing with a reasonable structure and a flexible cage.