| 摘要 |
The apparatus includes a vibrator (1) which excites a bearing (4) to vibrate. Output signals of outer race vibration detecting sensors (21b,21c) for an outer race (42) are added up in time sequence by an adder (23) and then supplied to a transfer function computing unit (3a). An output signal of an inner race vibration detecting sensor (21a) is also supplied to the transfer function computing unit. The transfer function computing unit calculates a transfer function H between the inner and outer races (between a hub shaft (41) and the outer race (42)) by fast Fourier transformation. On the basis of this transfer function H, there is obtained a vibration mode in which a resonance frequency fa appears in a position of - pi /2 phase difference from local-mode vibration components (in-phase components) contained in the input signals after erasing of the local-mode vibration components. A rigidity transformation computing unit (3c) determines the bearing rigidity on the basis of the resonance frequency.
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