Bearing Noise: Causes, Factors, and Mitigation Strategies
Bearing noise is a major component of overall mechanical noise. Generated by solid-body vibrations, it occurs when mechanical components—such as metal plates, gears, and bearings—experience collisions, impacts, and oscillations under the influence of friction, impacts, alternating mechanical stresses, or magnetic forces. Types of Bearings: Plain vs. Rolling Bearings Industrial bearings fall into two primary categories, each exhibiting distinct acoustic and mechanical behaviors: Plain Bearings (Sliding Bearings): Offer smooth operation, low vibration, and quiet performance. However, conventional plain bearings risk dry friction during startup due to inadequate lubricant film formation, leading to severe noise and catastrophic damage. Consequently, they are rarely used in critical machine tool drive shafts. Rolling Element Bearings: Typically constructed from four core components—an inner ring, an outer ring, rolling elements, and a cage. As the rolling elements rotate along the...