Diagnostic method for a ball bearing, in particular for an angular-contact ball bearing, a corresponding diagnostic system, and use of the diagnostic system
First Claim
1. A diagnostic method for a ball bearing, comprising the steps of:
- measuring mechanical vibrations produced by the ball bearing with a vibration sensor and generating a corresponding vibration signal having a frequency spectrum;
computing at least one fundamental kinematic frequency, with the at least one fundamental kinematic frequency depending on a current rotation frequency of the ball bearing and on a nominal pressure angle between a bearing inner race and a bearing outer race of the ball bearing;
determining from the measured frequency spectrum at least one bearing frequency;
computationally mapping the at least one bearing frequency to a current operating pressure angle;
computing a deviation between the current operating pressure angle and the nominal pressure angle; and
outputting a first diagnostic message when the deviation between the current operating pressure angle and the nominal pressure angle, is greater than a predefined maximum pressure angle deviation.
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Accused Products
Abstract
In a diagnostic method for at least one ball bearing, in particular for an angular-contact ball bearing for bearing a rapidly rotating spindle, mechanical vibration caused by the respective angular-contact ball bearing is acquired by at least one vibration sensor and outputted as a corresponding vibration signal. At least one bearing characteristic, fundamental kinematic frequency dependent on a current bearing rotational frequency is determined by computation. A corresponding bearing frequency in a measurement frequency spectrum of the respective vibration signal is determined by measurement. A first diagnostic message is output when at least one of the determined bearing frequencies deviates by a respective prescribed frequency deviation from the corresponding computational fundamental kinematic frequency.
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Citations
12 Claims
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1. A diagnostic method for a ball bearing, comprising the steps of:
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measuring mechanical vibrations produced by the ball bearing with a vibration sensor and generating a corresponding vibration signal having a frequency spectrum; computing at least one fundamental kinematic frequency, with the at least one fundamental kinematic frequency depending on a current rotation frequency of the ball bearing and on a nominal pressure angle between a bearing inner race and a bearing outer race of the ball bearing; determining from the measured frequency spectrum at least one bearing frequency; computationally mapping the at least one bearing frequency to a current operating pressure angle; computing a deviation between the current operating pressure angle and the nominal pressure angle; and outputting a first diagnostic message when the deviation between the current operating pressure angle and the nominal pressure angle, is greater than a predefined maximum pressure angle deviation. - View Dependent Claims (2, 3, 4, 5)
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6. A diagnostic system for a ball bearing, comprising:
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at least one vibration sensor for measuring a mechanical vibration produced by the ball bearing and for outputting a vibration signal representative of the mechanical vibration; and a measurement evaluation unit operatively connected to the at least one vibration sensor, said measurement evaluation unit having frequency measuring means configured to determine at least one bearing frequency from a measured frequency spectrum of the vibration signal, computation means configured to determine at least one fundamental kinematic frequency that is characteristic for the bearing and depends on a current rotation frequency of the bearing and on a nominal pressure angle between a bearing inner race and a bearing outer race of the ball bearing, computationally map the at least one bearing frequency to a current operating pressure angle; compute a deviation between the current operating pressure angle and the nominal pressure angle; and comparison means configured to output a first diagnostic message when the deviation between the current operating pressure angle and the nominal pressure angle is greater than a predefined maximum pressure angle deviation. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification