Inviting elements of the oscillation of NTN bearings
The Influencing Factors of Oscillation in NTN Bearings
The oscillation in NTN bearings is a key performance characteristic that affects the overall behavior and longevity of the bearing. This oscillation is primarily caused by mechanical vibrations generated during operation. These vibrations are transmitted through elastic waves in the surrounding medium, such as air, and can be perceived by the human ear, resulting in what we commonly refer to as sound or noise. Human hearing is sensitive to both frequency and intensity of sound, and prolonged exposure to excessive noise can lead to physiological or psychological discomfort. In the context of bearings, the working noise of NTN bearings is considered an important quality indicator. It is measured under specific conditions—such as when the bearing is operating on its inner ring, with the outer ring surface being the source—and recorded as the sound pressure level at a certain angle from the microphone. To ensure accurate measurement, the axial load applied to the NTN bearing must be evenly distributed across the outer ring via three flexible, equally spaced negative cymbals. The alignment of the load application line with the axis of the mandrel should not exceed 0.20 mm for coaxiality and 0.05 mm for straightness. Additionally, the stiffness of the load pad should not interfere with the natural oscillation of the bearing, and the resonant frequency of the system should remain outside the range of the bearing's own oscillation frequency. While oscillation and noise are related, they are distinct phenomena. User requirements often differ depending on the application. For example, in automotive or aerospace applications, low noise levels are typically more critical. However, in precision machinery such as machine tools, minimizing oscillation becomes the priority. In many cases, noise measurements are more commonly used due to their simplicity and availability of equipment. Although oscillation and noise are different, they often correlate within a specific frequency range, making noise measurement a practical alternative in many scenarios.
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