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Inviting elements of the oscillation of NTN bearings
Source: China Bearing Network Time: 2013-06-29
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The energy of the mechanical oscillation of the NTN bearing object is conveyed by the elastic wave composed of air and other medium; it is touched by the human auditory system; it is called the sound. The hearing of human beings in frequency and sound intensity; the part of the mind or the physiological that forms an adverse effect. Sound; commonly known as noise. The working noise of the tumbling NTN bearing is an inductive quality parameter; it is under the condition of working on the inner ring of the bearing; on the surface of the outer ring; in accordance with the relevant skill rules; measured in a certain azimuth The sound pressure level of the incident sound of the microphone directly transmitted by the NTN bearing.
The NTN bearing axial load is evenly applied to the outer ring of the NTN bearing through three equally spaced flexible negative cymbals on the same circumference; the coaxiality and straightness of the effect line of the load and the axis of the mandrel should not exceed 0. 20 mm and 0.05 mm. The stiffness of the flexible load pad is not limited by the transmission of the axial load and the constraint of the outer ring of the bearing under test; the oscillation of the NTN bearing should not be hindered; the resonant frequency of the system with the loading device should be at the bearing Outside the oscillation frequency.
NTN bearing oscillations are closely related to and different from noise. The user's demand for oscillation and noise often varies from target to target; for bearings used in automobiles, airplanes, and motors; general demand noise is low, and for fine machine tools, etc. The NTN bearing used; the demand oscillation is small. In most cases, the measurement of noise is more important; because the oscillation is simpler than the noise; therefore, the noise measurement equipment or the environment noise is large; the measurement method is commonly used instead of the measurement noise. Both of them have appropriate and appropriate correspondences within the true intermediate frequency range; such substitutions have been practically accurate.
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