Pump Inducer Abnormality Detection from Fatigue Damage Rate
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Solution Overview
Problem
Existing systems for diagnosing fatigue damage in inducers of manned flying objects lack accuracy in determining abnormality timing due to preset warning thresholds, which do not account for changing fatigue-damage accumulation rates, potentially leading to unsafe operations.
Innovation Solution
An abnormality determination device that includes a pressure acquisition unit, stress-response acquisition unit, accumulated-fatigue-damage-degree calculation unit, and lifetime-consumption-rate calculation unit, which convert pressure responses into stress responses using a transfer function to calculate the changing rate of fatigue damage over time, enabling timely detection of inducer abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a preset warning threshold is used for fatigue-damage degree, then the system is simple to operate, but the abnormality determination accuracy deteriorates when fatigue-damage accumulation rate changes
Solution Approach 1:
The patent applies the Dynamics principle by transitioning from a static preset threshold to a dynamic threshold that adapts to changing operating conditions. The determination unit dynamically adjusts the threshold based on real-time monitoring of fatigue-damage accumulation rates, allowing the system to maintain high accuracy across varying operational states while preserving ease of operation through automated adaptation.
Solution Approach 2:
The patent implements Parameter changes by modifying the threshold parameter based on operating conditions and fatigue-damage accumulation rates. Instead of using a fixed threshold, the system changes the threshold parameter dynamically according to monitored parameters such as stress responses and accumulation rates, thereby improving abnormality determination accuracy without complicating the overall system operation.
2Device complexity
If only accumulated fatigue-damage degree is monitored, then the measurement system is simple, but the abnormality detection timing is inaccurate when accumulation rate varies
Solution Approach 1:
The patent applies the Feedback principle by implementing a closed-loop monitoring system that continuously measures fatigue-damage accumulation rates and feeds this information back to the determination unit. This feedback mechanism enables the system to adjust abnormality determination thresholds in real-time based on actual accumulation rates, significantly improving detection timing accuracy while adding only moderate complexity through the use of standard sensing and processing components.
Data Source
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AI summary
An abnormality determination device according to one aspect of the present disclosure is an abnormality determination device that determines an abnormality of an inducer used for a pump, the abnormality determination device including a stress-response acquisition unit that acquires a stress response indicating a temporal change in stress applied to the inducer, an accumulated-fatigue-damage-degree calculation unit that calculates an accumulated fatigue-damage degree of the inducer based on the stress response, a lifetime-consumption-rate calculation unit that calculates a lifetime consumption rate that is a changing rate of the accumulated fatigue-damage degree with respect to time, and a determination unit that determines an abnormality of the inducer based on the accumulated fatigue-damage degree and the lifetime consumption rate, in which the inducer is used only for a predetermined use time per operation of the pump.