Brake Disc Oxidation Measurement Using Diamagnetic Response
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Solution Overview
Problem
Existing methods for measuring oxidation of carbon-carbon composite brake discs are either unreliable or require destructive access, making predictive maintenance challenging.
Innovation Solution
A non-destructive measurement device that utilizes the diamagnetic property of carbon-carbon composite materials to measure oxidation, comprising a means for measuring diamagnetism and converting it into an oxidation measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection or circumference measurement is used to measure oxidation, then the measurement method is simple, but the measurement precision and reliability are insufficient
Solution Approach 1:
The patent replaces mechanical measurement methods (visual inspection, circumference measurement) with a magnetic field-based measurement system. The device uses coils to generate magnetic fields and measures diamagnetic susceptibility, which is a physical property change caused by oxidation. This substitution enables precise, non-contact measurement of oxidation levels without the limitations of mechanical methods.
Solution Approach 2:
The patent measures changes in diamagnetic susceptibility as oxidation progresses. The measurement system detects parameter changes in the magnetic properties of the carbon-carbon composite material, specifically how the material's diamagnetic response changes with oxidation level. This allows quantitative measurement of oxidation through physical property changes rather than dimensional changes.
2Reliability
If circumference measurement is used to monitor oxidation, then the measurement can be performed externally, but the measurement becomes reliable only when oxidation is already advanced
Solution Approach 1:
The patent enables early detection of oxidation by measuring diamagnetic susceptibility changes that occur at the beginning of the oxidation process, before significant dimensional changes happen. By detecting oxidation at its initial stages through magnetic property changes, the system allows for predictive maintenance timing rather than waiting for advanced oxidation to manifest as measurable circumference reduction.
3Ease of operation
If destructive access is required to measure oxidation, then direct material sampling is possible, but the ease of operation and serviceability are reduced
Solution Approach 1:
The patent replaces destructive mechanical sampling with a non-contact magnetic field measurement system. Coils generate magnetic fields that penetrate the brake disc material without physical contact or disassembly. This allows oxidation measurement through the tire and rim structure, eliminating the need to remove components for direct material access while maintaining measurement capability.
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 device provides a reproducible and reliable measurement of oxidation, enabling predictive maintenance and identifying acceleration factors for oxidation.
Implementation Method 1
utilizes the diamagnetic property of the carbon-carbon composite
Data Source
AI summary
The invention relates to a device for measuring the oxidation of an element comprising a carbon-carbon composite, including a means for measuring the diamagnetism of the element and a means for converting the diamagnetism measurement into an oxidation measurement.