Rotating Electrical Machine Fatigue Damage Diagnostic System
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Solution Overview
Problem
Conventional damage diagnosis systems for rotating electrical machines face inaccuracies in evaluating low-cycle fatigue damage and predicting fatigue lifetime due to low analysis accuracy of elastic stress and strain, which affects the reliability and maintenance of these machines.
Innovation Solution
A damage diagnostic system that calculates elastic strain and stress using a quadratic function of rotational speed, converts these into total strain ranges, and cumulates fatigue damage rates to provide precise fatigue damage evaluation, enhancing the prediction of damage and remaining lifetime of rotating electrical machine components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional damage diagnosis systems are used, then the system structure is simple, but the measurement precision of fatigue damage and strain analysis is low
Solution Approach 1:
The system segments the fatigue damage evaluation into distinct functional modules: a strain calculation section that computes elastic strain and stress from rotational speed data, a conversion section that transforms elastic strain to total strain using Neuber's rule, and a fatigue damage rate calculation section that evaluates damage based on total strain. This modular segmentation enables precise measurement of fatigue damage while maintaining manageable system complexity through functional decomposition.
Solution Approach 2:
The patent introduces an intermediary conversion process using Neuber's rule that bridges the gap between elastic strain (easily calculated from rotational speed) and total strain (required for accurate fatigue damage assessment). This intermediary conversion section allows the system to achieve precise measurement of total strain without directly measuring it, thereby improving measurement precision while avoiding the need for complex direct strain measurement systems.
2Measurement precision
If elastic stress is analyzed without sensor data, then the analysis process is simple, but the prediction accuracy of strain and fatigue lifetime is low
Solution Approach 1:
The system performs preliminary calculation of elastic strain and stress from rotational speed data before converting to total strain and evaluating fatigue damage. By pre-calculating the elastic components using readily available rotational speed sensor data, the system prepares the necessary inputs for accurate fatigue assessment without requiring complex real-time analysis, thereby improving prediction accuracy while managing analysis process complexity.
Solution Approach 2:
The system uses feedback from rotational speed sensor measurements to continuously update the elastic strain and stress calculations, which then feed into the total strain conversion and fatigue damage rate evaluation. This feedback loop ensures that the prediction accuracy remains high by continuously incorporating actual operational data, while the systematic feedback mechanism manages complexity through structured data processing flows.
Data Source
AI summary
Accurate damage diagnosis is obtained using strain, typified by low-cycle fatigue damage and the like, representing a majority of the damage from age deterioration of a machine facility. A rotating electrical machine damage diagnostic system evaluates fatigue damage in a component of a rotating electrical machine based on a sensor. A strain range calculating section determines elastic strain and elastic stress in an evaluation area of the rotating electrical machine in terms of a quadratic function of a rotational speed of the rotating electrical machine detected by the sensor. Conversion of the elastic strain range and the elastic stress range into a total strain range is performed and a fatigue damage rate is calculated in the evaluation area of the rotating electrical machine from the total strain range resulting from the conversion. An integration section is provided for cumulating the fatigue damage rates to calculate a cumulated fatigue damage rate.