Railway Wheel Orifice Sensor Offset for Contact Point
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing railway wheel measurement technologies fail to accurately determine the lateral position of the wheel-rail contact point, especially at high speeds, and often weaken the wheel structure or are not applicable to all types of wheel tires.
Innovation Solution
A railway wheel design with strategically positioned deformation sensors offset from the neutral fiber plane in orifices, forming a Wheatstone bridge to measure vertical deformations and compensate for centrifugal forces, allowing precise determination of the lateral contact point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If deformation sensors are mounted in the neutral fiber plane of the orifice, then the measurement is simpler, but the sensitivity to lateral position of contact point is insufficient
Solution Approach 1:
The patent transitions from measuring in the neutral fiber plane (2D) to measuring in a plane offset from the neutral axis by distance e (adding a third dimensional aspect). This dimensional shift enables the stress gradient measurement to capture bending components that are sensitive to lateral contact position, thereby resolving the contradiction between measurement simplicity and measurement precision.
2Measurement precision
If numerous recesses are added to the wheel rim for strain gauges, then contact point determination is possible, but the wheel structure is weakened
Solution Approach 1:
Instead of adding numerous recesses throughout the wheel rim, the patent applies strain gauges locally in a specific region - within an orifice at a specific offset distance from the neutral axis. This localized measurement approach achieves contact point determination without compromising the overall structural integrity of the wheel rim.
3Measurement precision
If conventional measurement methods are used, then the setup is simpler, but accuracy at high speeds is compromised
Solution Approach 1:
The patent changes the measurement parameter from simple strain magnitude to stress gradient (derivative of stress with respect to position). By measuring the stress gradient at an offset location, the system captures bending components that are sensitive to lateral contact position, enabling accurate measurement at high speeds where conventional methods fail.
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 measurement of the lateral position of the wheel-rail contact point, improving the determination of mechanical forces and dynamic behavior, and can be applied to standard wheels without significant structural weakening.
Implementation Method 1
at least one deformation sensor being mounted in said orifice to measure the vertical deformations during the contact of the wheel with a rail
Implementation Method 2
the stress gradient inside an opening consists of a component due to compression and a component due to fabric bending. The stress gradient related to fabric bending is highly dependent on the lateral position of the contact point
Implementation Method 3
A railway wheel design with strategically positioned deformation sensors offset from the neutral fiber plane in orifices, forming a Wheatstone bridge to measure vertical deformations and compensate for centrifugal forces
Data Source
Figure 1~3
Figure 4~5
Figure 6A~6C
AI summary
A wheel (1) for a railway vehicle, the wheel (1) comprising a web (11) in which at least one orifice (3) is formed, at least one strain sensor (4) being mounted in said orifice (3) for measuring vertical strains when the wheel (1) contacts a rail, the web comprising an inner face (A), intended to be turned towards the center of a railway track in use, and an outer face (B) opposite the inner face (A), the web (11) comprising a neutral fiber plane (N) extending in the thickness of the web (11) at an equal distance from the inner face (A) and the outer face (B) of said orifice (3), the strain sensor (4) is offset from said neutral fiber plane (N) in order to increase the sensitivity of vertical strains to the lateral position of the point of contact of the wheel (1) with said rail.