Optical Wheel Evaluation for Tread Profile Defect Detection
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Solution Overview
Problem
Current wheel measurement solutions do not effectively measure attributes such as the profile of the tread surface, which can indicate defects like flat spots, out-of-roundness, gouges, and cracks, impacting the operability of wheels.
Innovation Solution
An optical evaluation method that illuminates a path along the wheel's circumference and captures image data to measure attributes, using specialized illumination and imaging techniques to detect defects, including the use of reflective materials and multi-spectral imaging to enhance contrast and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current wheel measurement solutions are used, then basic wheel attributes (rim thickness, flange thickness, wheel diameter) can be measured, but tread surface profile and other defect-related attributes cannot be measured
Solution Approach 1:
The measurement system segments the wheel inspection process into multiple specialized imaging components: a first imaging device for basic wheel attributes, a second imaging device for tread surface profile, and a third imaging device for defect detection. Each imaging device captures specific portions of the wheel, allowing comprehensive measurement of previously unmeasurable attributes while maintaining system modularity
Solution Approach 2:
The system transitions from traditional 2D wheel measurements to 3D profile measurements by capturing images at multiple positions around the wheel's circumference and combining them to generate three-dimensional representations of the tread surface, enabling accurate measurement of profile attributes and defect detection
2Measurement precision
If the wheel is illuminated to enhance image data, then measurement accuracy improves, but system complexity and energy consumption increase
Solution Approach 1:
The illumination system uses periodic strobe lighting synchronized with the wheel's rotation and the imaging capture rate. This periodic illumination provides sufficient light for accurate image capture during the brief exposure moments while allowing the illumination to remain off during intervals, significantly reducing overall energy consumption compared to continuous illumination
Solution Approach 2:
The illumination system directs light locally only to the specific portions of the wheel being imaged at any given moment, rather than illuminating the entire wheel or environment. This localized illumination approach minimizes energy consumption while ensuring sufficient brightness for accurate measurement of the target areas
3Adaptability or versatility
If multiple imaging devices are used to capture comprehensive wheel data, then measurement capability improves, but device complexity increases
Solution Approach 1:
Each imaging device in the system is designed with multi-functionality to perform multiple measurement tasks. For example, the imaging devices can capture both geometric attributes and defect information, and can image different portions of the wheel by adjusting their positioning and timing. This universality allows comprehensive wheel evaluation using a relatively compact set of imaging devices rather than requiring specialized single-purpose devices for each measurement type
Solution Approach 2:
The system merges multiple imaging functions into an integrated evaluation system that combines images from multiple devices and positions to create comprehensive wheel assessments. The image processing system merges data from different imaging devices, synchronizes images taken at different times and positions, and combines multiple measurement types into unified wheel attribute evaluations, reducing overall system complexity through integration
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
Enables accurate detection of defects along the wheel's circumference, ensuring the safe operation of wheels by providing detailed measurements and profiles, even in challenging environments like moving rail wheels.
Implementation Method 1
The path and/or wheel can be illuminated to enhance the resulting image data
Data Source
AI summary
A solution for optically evaluating a wheel along at least one circumference of the wheel is provided. Image data is obtained while the wheel moves along a path having a length of at least one circumference of the wheel. The path and/or wheel can be illuminated to enhance the resulting image data. One or more attributes of the wheel are measured based on the image data. The attributes can then be used to detect one or more defects in the wheel. In one embodiment, the wheel is a rail wheel, and a rail segment is illuminated. The rail can be specially configured to enhance a contrast between the rail and the rail wheel and/or to provide a consistent path for the rail wheel to travel.