Method for detecting structure-borne noise events in a roller bearing
First Claim
1. A method for detecting structure-borne sound events in a roller bearing, comprising:
- supplying a measurement signal (M) from a pressure-sensitive or strain-sensitive sensor which is arranged on the roller bearing to a frequency filter for filtering out undesirable signal components;
a microcomputer calculating a first variance value from digital values of the frequency filter output signal;
the microcomputer determining at least one second variance value from further digital values of the frequency filter output signal;
the microcomputer calculating a weighted arithmetic mean of the first variance value and one of the at least one second variance value using a recursive calculation; and
the microcomputer assessing any exceeding of the weighted arithmetic variance mean value above a preselected variance threshold value (VSW) as a structure-borne sound event which has been caused by mechanical damage to the roller bearing, and the frequency for exceeding the threshold can be associated with the point of origin of the damage in the bearing when a rotation speed and geometric conditions of the bearing are known;
wherein the weight used in calculating the weighted arithmetic mean of the variance values is a constant with respect to a particular recursive calculation.
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Abstract
A method for detecting structure-borne noise events in a roller bearing, wherein a measuring signal M of a pressure or dilatation sensor arranged on a roller bearing is fed to a frequency filter for filtering out undesired signal parts. A first variance value is calculated from digital values of the frequency filter output signal and at least one second variance value is calculated from other digital values of the frequency filter output signal and a weighted arithmetic average of the at least two variance values is calculated with the aid of a recursive calculation of the variance value. If the weighted arithmetic variance average value exceeds a pre-selected variance threshold value, then it is assessed that a structure-borne noise event provoked by mechanical damage to the roller bearing has occurred.
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Citations
9 Claims
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1. A method for detecting structure-borne sound events in a roller bearing, comprising:
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supplying a measurement signal (M) from a pressure-sensitive or strain-sensitive sensor which is arranged on the roller bearing to a frequency filter for filtering out undesirable signal components; a microcomputer calculating a first variance value from digital values of the frequency filter output signal; the microcomputer determining at least one second variance value from further digital values of the frequency filter output signal; the microcomputer calculating a weighted arithmetic mean of the first variance value and one of the at least one second variance value using a recursive calculation; and the microcomputer assessing any exceeding of the weighted arithmetic variance mean value above a preselected variance threshold value (VSW) as a structure-borne sound event which has been caused by mechanical damage to the roller bearing, and the frequency for exceeding the threshold can be associated with the point of origin of the damage in the bearing when a rotation speed and geometric conditions of the bearing are known; wherein the weight used in calculating the weighted arithmetic mean of the variance values is a constant with respect to a particular recursive calculation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification