Wheel Deformation Control Using Angular Velocity Radius Mapping
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Solution Overview
Problem
Existing methods for monitoring wheel deformation in railway vehicles only allow for relative deformation determination, providing partial knowledge of the wheel's condition, which is insufficient for ensuring safety in railway operations.
Innovation Solution
A method and system for controlling wheel deformation that quantifies deformations and evaluates the actual shape of the wheel by using a sensor with a toothed wheel and a sensing element to measure angular velocity, combined with a calculation module that calculates wheel radius using direct and filtered time deviations, employing a Hann window for improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor measures the duty cycle of a toothed wheel to determine relative deformation, then the monitoring function is achieved, but only partial knowledge of the wheel's condition is obtained which is insufficient for ensuring safety
Solution Approach 1:
The wheel circumference is divided into multiple predefined angular positions, with each position having an associated radius value. This segmentation allows comprehensive measurement of the wheel's geometric characteristics at discrete points, transforming the incomplete relative deformation data into complete absolute shape information.
Solution Approach 2:
The invention transitions from measuring only temporal duty cycle variations to measuring spatial-radius relationships at multiple angular positions. By adding the dimensional aspect of radial measurements at different angular positions, the system obtains complete information about the wheel's actual shape rather than just relative deformation.
2Reliability
If only relative deformation is determined, then the monitoring system remains simple, but the safety assurance is insufficient
Solution Approach 1:
The sensor system serves multiple functions: it measures angular velocity, determines direct time deviation, calculates radius values at multiple angular positions, and evaluates the complete wheel shape. This multi-functionality increases reliability without proportionally increasing device complexity.
Solution Approach 2:
The system calculates a consolidated wheel radius value by processing radius measurements from multiple angular positions, creating a feedback mechanism that continuously monitors and evaluates wheel condition. This feedback loop ensures reliable safety monitoring through comprehensive data processing.
Data Source
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AI summary
This method for controlling the deformation of a wheel (4) includes the following steps: - while the wheel (4) rolls on a rolling surface (8), obtaining, for a plurality of predefined angular positions (θi) on the wheel, a parameter characterizing an angular velocity of the wheel (4) when the wheel (4) is in contact with the rolling surface (8) at said predefined angular position (θi); and - calculating a radius value (Ri) of the wheel (4) for each predefined angular position (θi) using the parameter characterizing the angular velocity obtained for said angular position (θi).