Magnetic Chip Detector Using Multi-Current Resistance Measurement
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Solution Overview
Problem
Current magnetic chip detectors in aircraft engines lack effectiveness in accurately detecting the size and quantity of metal chips in engine fluid, which is crucial for timely maintenance and preventing engine failures.
Innovation Solution
A method and system that apply a plurality of excitation currents across a magnetic chip detector to measure resistance values, determining a chip size indication by summing or weighting these values, and detecting chips when the indication exceeds a threshold, allowing for improved detection of chip size and quantity in aircraft engine fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single excitation current is used in magnetic chip detectors, then the device complexity is reduced, but the measurement precision of chip size and quantity deteriorates
Solution Approach 1:
The detection process is segmented into multiple measurement steps, each using a different excitation current level. The total resistance measurement is divided into multiple components (R1, R2, R3, etc.) corresponding to different current levels, allowing separate characterization of magnetic chip effects versus conductive chip effects
Solution Approach 2:
The excitation current parameter is changed across multiple measurement cycles. By varying the current level (I1, I2, I3, etc.), the system exploits the non-linear magnetic response at different current levels to distinguish between magnetic and conductive chip contributions, thereby improving measurement precision without excessive complexity
2Measurement precision
If multiple excitation currents are applied to improve chip detection accuracy, then the measurement precision improves, but the use of energy increases
Solution Approach 1:
The system applies multiple excitation currents, but uses a simplified calculation approach that requires only a subset of the theoretically possible measurements. The chip size indication is calculated using a weighted sum of resistance values from selective current levels, performing sufficient action to achieve precision without exhaustive energy consumption
Solution Approach 2:
The system performs preliminary measurements at different current levels to establish baseline resistance values before calculating the final chip size indication. This preliminary characterization of the magnetic circuit response enables more efficient energy use during actual detection by pre-establishing the relationship between current levels and magnetic chip resistance
3Device complexity
If traditional magnetic chip detectors are used, then the device simplicity is maintained, but the detection accuracy of chip size and quantity deteriorates
Solution Approach 1:
The patent replaces purely mechanical/magnetic detection methods with an electrical measurement system. By measuring electrical resistance at multiple current levels and processing these signals computationally, the system achieves superior detection accuracy while maintaining relative device simplicity through the use of standard electrical measurement components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of chip detection, enabling timely maintenance actions by distinguishing between normal wear and potential engine failures, and allows for dynamic adjustment of sensitivity and threshold settings for optimal performance.
Implementation Method 1
measuring a corresponding plurality of resistance values Ri
Implementation Method 2
Magnetic chip detectors are generally mounted to a fluid system of an aircraft engine to assess the presence or absence of metallic chips in the fluid
Data Source
AI summary
There is described herein methods and systems for detecting electrically-conductive particles (chips) in fluid of an aircraft engine. The method comprises applying a plurality of excitation currents Ii across a magnetic chip detector mounted to a fluid system of the aircraft engine and measuring a corresponding plurality of resistance values Ri, where i is an integer that varies from 1 to N, and where N corresponds to a number of different excitation currents applied across the magnetic chip detector. The method further comprises determining a chip size indication Y from the plurality of resistance values Ri, and detecting a chip in the fluid when the chip size indication Y exceeds a threshold Ythres.