Broken Wheel Detection via Structured Light Scanning
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Solution Overview
Problem
The diverse variety of railway wheel cross-sections in use poses a challenge for reliable wheel defect detection, especially since many defects occur on the outer edge of the wheel rim and are not detectable at conventional Wheel Impact and Load Detection sites, requiring sophisticated approaches to assess specific locations on the wheel circumference accurately, especially at high speeds and varying climatic conditions.
Innovation Solution
A broken wheel detection system utilizing structured light generators and high-resolution digital cameras mounted on rigid frames outside the rails, capable of assessing the entire wheel rim circumference without prior dimensional information, using processors and sensors to identify defects by comparing the consistency of structured light lines across multiple elevation scan frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional Wheel Impact and Load Detection sites are used, then the detection system is simple and cost-effective, but defects on the outer edge of the wheel rim cannot be detected
Solution Approach 1:
The patent transitions from conventional impact/load detection (measuring force and vibration) to optical surface scanning (measuring geometric deviations). By projecting structured light patterns onto the wheel rim and capturing reflected light with cameras, the system detects defects through surface elevation changes in the optical dimension, enabling detection of outer edge defects that conventional methods miss.
Solution Approach 2:
The patent replaces mechanical impact sensors with an optical measurement system. Instead of using mechanical contact or vibration sensors to detect wheel defects, the system uses structured light projection and digital image processing to non-contactly scan the wheel rim surface, substituting mechanical detection with optical field-based measurement.
2Measurement precision
If the system scans the entire wheel circumference to detect all defects, then detection accuracy improves, but the detection time increases
Solution Approach 1:
The patent implements continuous scanning of the wheel circumference as the wheel rotates, capturing multiple elevation scan frames in sequence. This continuous action ensures complete coverage of the entire wheel rim without stopping the wheel, maintaining high detection accuracy while minimizing detection time by processing data in real-time during wheel rotation.
Solution Approach 2:
The system captures elevation scan frames at periodic intervals as the wheel rotates, using the periodic passage of the wheel through the scanning zone to acquire multiple measurements. This periodic sampling allows the system to reconstruct the complete wheel circumference profile efficiently, balancing comprehensive detection with rapid data acquisition.
3Measurement precision
If high-resolution scanning is used to detect small defects, then detection accuracy improves, but the system becomes more sensitive to environmental conditions
Solution Approach 1:
The patent uses feedback through comparison of multiple elevation scan frames to distinguish actual defects from environmental noise. By analyzing consistency across multiple scans and identifying deviations from the expected wheel geometry pattern, the system can detect small defects while filtering out spurious signals caused by varying environmental conditions such as lighting changes or wheel vibrations.
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 and reliable detection of broken wheels on rail vehicles moving at high speeds, ensuring wheel integrity and minimizing traffic disruptions, with a high degree of accuracy and low error rates, capable of detecting defects smaller than 10 mm×10 mm, and operating effectively in various weather conditions.
Implementation Method 1
a number of structured light generators
Implementation Method 2
optically aligned high resolution digital cameras
Data Source
AI summary
A broken wheel detection system for detecting broken wheels on rail vehicles even when such vehicles are moving at a high rate of speed by determining the positions, lengths, or orientations of structured light lines projected against passing wheels.