| 摘要 |
While maintaining an outer ring in a fixed state, an inner ring is rotated. Radial vibrations of the outer ring are detected by a vibration pickup, and detection signals are delivered to a frequency converter via an amplifier. The frequency converter determines, by Fourier transformation, the rotation frequency of the inner ring and the revolution frequency of balls. The processor then calculates the contact angle of a rolling bearing on the basis of these rotation frequency and revolution frequency.
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