The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2001
Filed:
Aug. 12, 1999
Hisakazu Tadokoro, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
In a bearing rigidity evaluation apparatus, a vibration portion,excites a bearing,to vibrate. Vibrations of the bearing,thus excited are detected by vibration detecting sensors,and,Output signals of the vibration detecting sensors,and,for an outer race,are added up in time sequence by an adder,and then supplied to a transfer function computing unit,An output signal of the vibration detecting sensor,is supplied to the transfer function computing unit,The transfer function computing unit,calculates a transfer function H between inner and outer races (between a hub shaft,and the outer race,) by FFT. On the basis of this transfer function H, there is obtained a vibration mode in which a resonance frequency (natural frequency) fa appears in a position of −&pgr;/2 phase difference from local-mode vibration components (in-phase components) contained in the aforementioned input signals after erasing of the local-mode vibration components.