Anomaly determination apparatus, anomaly determination method, and program
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Solution Overview
Problem
Existing anomaly determination methods for mechanical elements in rotating machines face accuracy issues due to variations in operational states, as anomalies may appear differently in electrical feature amounts depending on the machine's operation state, leading to decreased determination accuracy when using a single reference.
Innovation Solution
An anomaly determination apparatus that considers the variation in the relationship between mechanical element anomalies and electrical feature amounts caused by changes in rotational frequency, using a determining unit to correct deviations and generate determination references based on normal operation states, allowing for more accurate anomaly detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single reference is used for determining anomalies based on electrical feature amounts regardless of the operation state, then the determination method is simple, but the accuracy of anomaly determination decreases
Solution Approach 1:
The patent applies dynamics by making the determination reference variable according to the operation state of the rotating machine. Instead of using a fixed reference value, the system dynamically adjusts the reference based on rotational frequency and other operational parameters, allowing accurate anomaly detection across varying operating conditions while maintaining a relatively simple determination framework
Solution Approach 2:
The patent changes the parameter of the determination reference based on the operation state, specifically adjusting it according to rotational frequency. By modifying the reference parameter dynamically, the system maintains high determination accuracy across different operating states without requiring completely separate determination methods for each state
2Measurement precision
If the determination reference is adjusted according to operation state, then the accuracy of anomaly determination improves, but the complexity of the determination method increases
Solution Approach 1:
The patent adjusts the determination reference parameter according to operational parameters such as rotational frequency. This allows the system to maintain high determination accuracy across different operation states by dynamically modifying the reference value, while avoiding the need for entirely separate determination systems for each state
Solution Approach 2:
The patent creates a universal determination method that can handle multiple operation states through a single framework. By using operation-state-dependent reference adjustment, the system achieves multi-functionality, allowing one determination system to accurately assess anomalies across various rotational frequencies and operating conditions without requiring separate specialized systems
Data Source
AI summary
Provide a technology that enables more appropriate determinations relating to the anomaly of a mechanical element in a rotating machine. The control device 40 according to an embodiment of the present disclosure includes the anomaly determining unit 403 configured to make a determination relating to an anomaly of a mechanical element of the compressor 10, based on an electrical feature amount of the compressor 10 that is electrically driven by the electric motor 20, wherein the electrical feature amount is a particular frequency component of a signal representing a physical amount that is correlated with a current of the electric motor 20 configured to drive the compressor 10, the particular frequency component is a predetermined positive integral multiple component of a rotational frequency of the compressor 10, and the anomaly determining unit 403 makes the determination relating to an anomaly of the mechanical element of the compressor 10, in consideration of a variation of a relationship between the anomaly of the mechanical element and the electrical feature amount of the compressor 10 (the electric motor 20), the variation being caused by a change in the rotational frequency of the compressor 10.