METHOD AND APPARATUS FOR RECOGNIZING A BEARING DAMAGE USING OSCILLATION SIGNAL ANALYSIS
1 Assignment
0 Petitions
Accused Products
Abstract
A device for recognizing bearing damage of a bearing (3), on which an object (4) which rotates at a rotational frequency is mounted, having at least one oscillation sensor (2) for converting an oscillation signal output by the bearing (3) into an electrical signal and having a calculation unit (8) for performing a first frequency transformation for multiple time windows of the oscillation signal to generate multiple time window spectra associated with the particular time windows and for performing a second frequency transformation for multiple frequency bands of the time window spectrograms to generate a multiband modulation spectrum, which, for modulation frequencies which are a function of the rotational frequency of the rotating object (4) because of bearing damage of the bearing (3), have signal amplitudes, the level thereof disclosing an extent of the bearing damage.
24 Citations
28 Claims
-
1-15. -15. (canceled)
-
16. A method for recognizing bearing damage of a bearing, comprising the steps of:
-
transforming with a first wavelet transformation in a plurality of time windows an oscillation signal generated by the bearing, which supports an object that rotates with a rotational frequency, from a time domain into a frequency domain, to generate a plurality of time window spectra, with each time window spectrum associated with a corresponding time window; and generating with a second wavelet transformation from several frequency bands of the plurality of time window spectra a multiband modulation spectrum having modulation frequencies, which depend on a rotational frequency of the rotating object, and signal amplitudes, which depend on a degree of the bearing damage. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
-
-
25. Apparatus for identifying bearing damage of a bearing which supports an object that rotates with a rotational frequency, said apparatus comprising:
-
at least one oscillation sensor converting an oscillation signal outputted from the bearing into an electrical signal; and a calculation unit configured to transform with a first wavelet transformation in a plurality of time windows the oscillation signal from a time domain into a frequency domain, to generate a plurality of time window spectra, with each time window spectrum associated with a corresponding time window; generate with a second wavelet transformation from several frequency bands of the plurality of time window spectra a multiband modulation spectrum having modulation frequencies, which depend on a rotational frequency of the rotating object, and signal amplitudes, with a level of the signal amplitudes depending on a degree of the bearing damage. - View Dependent Claims (26, 27, 28)
-
Specification