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:
Feb. 24, 2004
Filed:
Dec. 06, 2001
Katsutoshi Matsuoka, Kanagawa, JP;
NSK Ltd., Tokyo, JP;
Abstract
The x- and y-direction vibration components of radial vibration of a rotational shaft obtained by measurement from x and y directions are transformed into frequency sample values {X Y , k=0, 1, . . . N−1} by discrete Fourier transform. RMS amplitude values {2 (2 &pgr;/M)|, j=0, 1, . . . M/2−1} are calculated at azimuths {&thgr; =2 &pgr;/M, j=0, 1, . . . M/2−1} corresponding to 0 to &pgr; on the basis of frequency sample values at frequency points {k , i=1, . . . P} corresponding to specific frequencies {fi, i=1, . . . P} of NRRO vibration components selected from the x- and y-direction frequency sample values obtained by the discrete Fourier-transform. RMS evaluation values A are selected from these RMS amplitude values.