Rail Vehicle Axle Crack Detection With Optical Camber Sensing
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Solution Overview
Problem
Current methods for inspecting freight car axles for defects, particularly axle body and journal filet cracks, are labor-intensive and costly, often requiring axle removal and are unable to perform in-service inspections due to accessibility issues and the obscuring effect of roller bearings.
Innovation Solution
A system and method for in-service inspection using a projector to measure the camber angle of a wheel attached to the axle by projecting lines or range finding beams, determining defects based on camber angle measurements, and generating alerts for potential defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional inspection methods are used to detect axle defects, then inspection accuracy is improved, but labor cost and time consumption increase significantly
Solution Approach 1:
The patent replaces manual mechanical inspection with an automated optical measurement system. A projector projects reference lines onto the wheel tread, and a sensor array captures the deformed lines to calculate wheel geometry parameters, automatically detecting axle defects without manual intervention.
Solution Approach 2:
The patent creates an optical copy of the wheel geometry by projecting reference lines onto the wheel surface and capturing their deformation. This optical copying method enables rapid measurement of wheel parameters and indirect detection of axle defects without physical contact or disassembly.
2Measurement precision
If axle removal is performed for inspection, then comprehensive defect detection is improved, but operational availability deteriorates
Solution Approach 1:
The patent enables the wheelset to be inspected in its installed position on the vehicle, eliminating the need for removal. The measurement system captures wheel geometry data through the wheel tread while the axle remains in service, allowing continuous operation without inspection downtime.
Solution Approach 2:
The patent measures axle defects indirectly by observing wheel tread geometry deformation in a different dimension. Instead of directly inspecting the axle, the system projects lines onto the wheel surface and analyzes their deformation patterns to infer axle conditions, enabling inspection without physical access to the axle.
3Area of stationary object
If visual inspection of axle body is attempted, then inspection coverage is improved, but inspection reliability deteriorates due to accessibility issues
Solution Approach 1:
The patent uses the wheel tread as an intermediary to detect axle defects. The projector and sensor array are positioned to access only the wheel tread surface, which serves as a mediator that transmits information about the axle's condition through its geometric deformation, eliminating the need for direct axle access.
4Productivity
If journal filet inspection is performed with bearing installed, then in-service inspection capability is improved, but detection precision deteriorates due to obscuration
Solution Approach 1:
The patent shifts the inspection dimension from direct axle surface observation to indirect wheel tread geometry measurement. By projecting reference lines onto the wheel tread and analyzing their deformation, the system detects journal filet cracks through their effect on wheel geometry, bypassing the obscuration caused by installed bearings.
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 cost-effective and efficient in-service inspection of freight car axles, detecting defects without removing the axles from service, thereby reducing labor costs and improving safety by preventing derailments.
Implementation Method 1
transmitting, from a projector, a plurality of range finding beams onto a surface of a wheel attached to the target axle
Data Source
AI summary
Methods and systems for in-service inspection of freight car axles are provided. A camber angle of a wheel attached to a target axle is measured at one or more points in a revolution of the wheel. A determination of whether a defect is present in the target axle is made based on the measured camber angle at the one or more points in the revolution of the wheel. A determination that a defect is present in the target axle is made when a camber angle of the wheel at one or more points in the revolution of the wheel exceeds a threshold, and/or a determination that a defect is not present is made when no camber angle of the wheel at any point in the revolution of the wheel exceeds the predetermined threshold. An alert is generated in response to determining that a defect is present.