Method and an apparatus for predicting the condition of a machine or a component of the machine
First Claim
1. A computer-readable medium having a program recorded thereon, whereinthe program makes a computer perform a method for predicting the condition of a machine or a component of the machine based on measurements of a condition monitoring parameter,a potential failure level of the condition monitoring parameter has been defined, at which level damage of the machine or component is considered initiated, anda pattern for the condition monitoring parameter has been defined, which pattern reflects an expected behavior of the monitoring parameter after damage has been initiated, plurality of measurement values of the condition monitoring parameter have been stored in a moving window,the method comprising the steps ofa) obtaining a new measurement value of the condition monitoring parameter,b) comparing the new measurement value with the latest stored measurement value, and discard the new measurement value if it is smaller than the latest stored measurer measurement value, and otherwise replace the oldest of the measurement values stored in the moving window with the new measurement value,c) comparing the new measurement value with the potential failure level of the condition monitoring parameter, and repeating the steps (a)-(c) until the new measurement value exceeds the potential failure level of the condition monitoring parameter,d) determining the point in time when the monitoring parameter exceeded the potential failure level,e) receiving a new measurement value of the condition monitoring parameter,f) comparing the new measurement value with the latest stored measurement value, and discarded the new measurement value if it is smaller than the latest stored measurement value,g) comparing the new measurement value with an expected value determined in accordance with said defined pattern for the condition monitoring parameter and the time elapsed since the point in time the monitoring parameter exceeded the potential failure level, and discard the new measurement value if it deviates too much from the pattern, and otherwise replace the oldest of the measurement values stored in the moving window with the new measurement value, andh) predicting level of the condition monitoring parameter at a future point in time based on the measurement values stored in the moving window,when said program is run on the computer.
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Accused Products
Abstract
The present invention relates to a method and an apparatus for predicting the condition of a machine or a component of the machine based on measurements of a condition monitoring parameter. The apparatus comprising—a data storage (6) for storing a moving window including measurement values of the condition monitoring parameter,—a monitoring module (7) configured to determine when a measurement value exceeds a potential failure level at which damage of the machine or component is considered initiated, and to determine the point in time (tP) when the monitoring parameter exceeded the potential failure level,—a data cleaning module (8) configured to discard a new measurement value if it is smaller than the latest stored measurement value in the moving window, to determine an expected value for the measurement based on a defined pattern for the condition monitoring parameter, which pattern reflects an expected behavior of the monitoring parameter after damage has been initiated, and the time elapsed since the point in time the monitoring parameter exceeded the potential failure level, and to discard the new measurement value if it deviates too much from the expected value, and to store not discarded measurement values in the moving window, and—a prediction module (10) configured to predict the level of the condition monitoring parameter at a future point in time based on the measurement values stored in the moving window.
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Citations
9 Claims
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1. A computer-readable medium having a program recorded thereon, wherein
the program makes a computer perform a method for predicting the condition of a machine or a component of the machine based on measurements of a condition monitoring parameter, a potential failure level of the condition monitoring parameter has been defined, at which level damage of the machine or component is considered initiated, and a pattern for the condition monitoring parameter has been defined, which pattern reflects an expected behavior of the monitoring parameter after damage has been initiated, plurality of measurement values of the condition monitoring parameter have been stored in a moving window, the method comprising the steps of a) obtaining a new measurement value of the condition monitoring parameter, b) comparing the new measurement value with the latest stored measurement value, and discard the new measurement value if it is smaller than the latest stored measurer measurement value, and otherwise replace the oldest of the measurement values stored in the moving window with the new measurement value, c) comparing the new measurement value with the potential failure level of the condition monitoring parameter, and repeating the steps (a)-(c) until the new measurement value exceeds the potential failure level of the condition monitoring parameter, d) determining the point in time when the monitoring parameter exceeded the potential failure level, e) receiving a new measurement value of the condition monitoring parameter, f) comparing the new measurement value with the latest stored measurement value, and discarded the new measurement value if it is smaller than the latest stored measurement value, g) comparing the new measurement value with an expected value determined in accordance with said defined pattern for the condition monitoring parameter and the time elapsed since the point in time the monitoring parameter exceeded the potential failure level, and discard the new measurement value if it deviates too much from the pattern, and otherwise replace the oldest of the measurement values stored in the moving window with the new measurement value, and h) predicting level of the condition monitoring parameter at a future point in time based on the measurement values stored in the moving window, when said program is run on the computer.
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8. An apparatus for predicting the condition of a machine or a component of the machine based on measurements of a condition monitoring parameter, comprising:
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a communication unit configured to obtain measurement values of the condition monitoring parameter, a data storage for storing a moving window including measurement values a monitoring module configured to monitor the measurement values and to determine when a measurement value exceeds a potential failure level at which damage of the machine or component is considered initiated, and to determine the point in time when the monitoring parameter exceeded the potential failure level, a data cleaning module configured to discard a new measurement value if it is smaller than the latest stored measurement value in the moving window, to determine an expected value for the measurement based on a defined pattern for the condition monitoring parameter, which pattern reflects an expected behavior of the monitoring parameter after damage has been initiated, and the time elapsed since the point in time the monitoring parameter exceeded the potential failure level, to discard the new measurement value if it deviates toe much from the expected value, to store not discarded measurement values in the moving window, and to replace the oldest of the measurement values stored in the moving window with the new measurement value if the moving window is full, and a prediction module configured to predict the level of the condition monitoring parameter at a future point in time based on the measurement values stored in the moving window. - View Dependent Claims (9)
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Specification