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 a roller bearing to a frequency filter for filtering out undesirable signal components;
- calculating a first variance value from digital values of the frequency filter output signal;
determining at least one second variance value from further digital values of the frequency filter output signal;
calculating a weighted arithmetic mean of the first and second variance values from the at least two variance values using a recursive calculation, and 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.
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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. The aim of the invention is to determine structure-borne noise waves or structure-borne noise events by an evaluation device. As a result, 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 the weighted arithmetic average of the at least two variance values (new variance, old variance) is calculated with the aid of a retrocursive calculation of the variance value. A surpassing of the weighted arithmetic variance average value (V) exceeds a pre-selected variance threshold value (vsw). It is subsequently evaluated as a structure-borne noise event provoked by mechanical damage to the roller bearing.
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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
supplying a measurement signal (M) from a pressure-sensitive or strain-sensitive sensor which is arranged on a roller bearing to a frequency filter for filtering out undesirable signal components; -
calculating a first variance value from digital values of the frequency filter output signal;
determining at least one second variance value from further digital values of the frequency filter output signal;
calculating a weighted arithmetic mean of the first and second variance values from the at least two variance values using a recursive calculation, and 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification