PMG Magnetic Field Mapping With Hall Sensors and Chord Inversion
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Solution Overview
Problem
High-temperature superconducting maglev transportation systems face challenges in precisely and efficiently detecting magnetic field intensity irregularities, which can lead to persistent oscillations and potential failure of the superconductor's levitation and guidance functions, impacting operational safety.
Innovation Solution
A magnetic field intensity measurement method and apparatus using a chord-based multi-point measurement system, involving Hall effect sensors and an inversion model based on the least squares method, to reconstruct the magnetic field intensity distribution above the PMG, ensuring high precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement methods are used for PMG magnetic field intensity, then the measurement process is simple, but the measurement precision and stability are insufficient
Solution Approach 1:
The measurement system is divided into multiple independent measurement points arranged along the PMG surface. Each measurement point uses a Hall effect sensor to independently measure magnetic field intensity, allowing comprehensive coverage of the magnetic field distribution while maintaining modular system architecture that balances precision with manageable complexity.
Solution Approach 2:
A multi-point measurement system acts as an intermediary between the PMG magnetic field source and the analysis system. By distributing multiple measurement points across the magnetic field region, the system captures spatial variations in magnetic field intensity, providing detailed data for detecting irregularities while maintaining system stability through redundant measurements.
2Reliability
If multi-point measurement system is implemented, then measurement accuracy improves, but system complexity and cost increase
Solution Approach 1:
The multi-point measurement system serves multiple functions simultaneously: it measures magnetic field intensity at various locations, detects spatial irregularities, provides redundant data for stability, and enables comprehensive analysis of PMG performance. This multi-functionality justifies the increased system complexity by delivering enhanced reliability and measurement stability.
Solution Approach 2:
The system changes the measurement parameter from single-point to multi-point spatial distribution. By measuring magnetic field intensity at multiple predetermined locations along the PMG, the system transforms a simple intensity measurement into a comprehensive spatial mapping, improving reliability through multiple data points while systematically managing complexity through structured measurement geometry.
3Reliability
If magnetic field intensity irregularities are not detected, then the system operates without intervention, but persistent oscillations and potential failure occur
Solution Approach 1:
The measurement system provides continuous feedback on magnetic field intensity distribution by monitoring at multiple points. When irregularities are detected through comparison of measured values against expected distributions, the system can trigger alerts or corrective actions, preventing persistent oscillations and potential failures while maintaining normal operation when conditions are acceptable.
Solution Approach 2:
The system performs preliminary detection of magnetic field irregularities before they can cause operational problems. By continuously monitoring magnetic field intensity at multiple points, the system identifies spatial variations and anomalies in advance, allowing preventive measures to be taken before persistent oscillations or failures occur, thereby enhancing operational safety.
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
The method provides superior measurement accuracy and stability, effectively addressing the challenges of magnetic field intensity irregularities, ensuring safe and stable operation of maglev trains by accurately measuring and optimizing the PMG magnetic field.
Implementation Method 1
A magnetic field intensity measurement method and apparatus using a chord-based multi-point measurement system, involving Hall effect sensors and an inversion model based on the least squares method
Data Source
AI summary
The present invention relates to the technical field of maglev transportation, specifically revealing a method and apparatus for measuring magnetic field intensity in high-temperature superconducting maglev transportation systems. The method includes: Establishing the top surface of the permanent magnet guideway (PMG) as the reference datum for magnetic field intensity measurements; developing a multi-point chord measurement system with parameters including system sampling interval, system order, and chord measurement configuration; computing intermediate chord values; constructing an inversion model incorporating the least squares method and employing this model to derive the vertical displacement of the reference chord baseline; determining gap sensor locations and deploying an array of Hall effect sensors along the direction of magnetic field intensity measurement; adjusting the reference datum position; and calculating the magnetic field intensity distribution above the reference datum using interpolation techniques based on the Hall effect sensor array measurements.