Dynamic Threshold Defect Detection for Rotating Arrangements
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Solution Overview
Problem
Existing methods for detecting defects in rotating arrangements fail to identify pre-existing faults during installation, leading to delayed detection of issues that can cause complete arrangement failure.
Innovation Solution
A device that defines a dynamic threshold by combining static thresholds of the monitored rotating element with the mean value of similar functioning elements, allowing for the detection of defects present at installation time by comparing current parameter values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static thresholds are used for defect detection, then the detection method is simple, but pre-existing defects cannot be detected
Solution Approach 1:
The system performs preliminary monitoring of parameter values during a monitoring period before establishing the final defect detection threshold. This preliminary action captures the actual operating conditions and pre-existing defects, allowing the dynamic threshold to be based on real data rather than static assumptions, thereby enabling detection of defects present at installation time
Solution Approach 2:
The patent transitions from static thresholds to dynamic thresholds that adapt based on monitored parameter values. The threshold is calculated as a function of the mean and standard deviation of monitored values, allowing it to dynamically adjust to the actual operating conditions and detect deviations that indicate defects
2Reliability
If monitoring starts only after installation, then new defects can be detected, but pre-existing defects remain undetected
Solution Approach 1:
The system performs preliminary monitoring during an initial period after installation to establish a baseline of normal operation. This preliminary data collection enables the detection of pre-existing defects by comparing subsequent measurements against this established baseline, rather than waiting for defects to manifest beyond the monitoring period
Solution Approach 2:
The system continuously monitors parameter values and uses this feedback to update the dynamic threshold and detect defects. The feedback loop compares current measurements against the dynamically adjusted threshold, enabling timely detection of both pre-existing and newly developing defects
Data Source
AI summary
A device for detecting a defect of a rotating arrangement is disclosed. The rotating arrangement provides one or more rotating elements or groups of rotating elements. The device includes a definition unit for defining a dynamic threshold based on a static threshold of an actually monitored rotating element or group of rotating elements and based on a mean value of static thresholds of a plurality of similar functioning rotating elements or groups of rotating elements, and a detection unit for detecting a defect by comparing a current parameter value of the actually monitored rotating element or group of rotating elements with the dynamic threshold. Also, a method for detecting a defect of a rotating arrangement is disclosed.