Railway Track Structural Parameter Determination via Deflection Shape Analysis
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Solution Overview
Problem
Current methods for determining structural parameters of railway tracks are either complex, destructive, time-consuming, or focused on a single parameter, often requiring multiple measurements and unable to assess a set of parameters simultaneously.
Innovation Solution
A method utilizing a sensor array on a measurement vehicle to measure rail deflection shape under different loads, comparing it with a theoretical model to determine structural parameters such as track modulus, stress-free temperature, and critical speed in a single passage, allowing for continuous and non-destructive assessment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple separate measurement methods are used to determine different structural parameters, then measurement precision is improved, but measurement time and device complexity increase
Solution Approach 1:
The patent combines multiple measurement functions into a single integrated system. The sensor array simultaneously measures deflection shapes under different loads, and the processor determines multiple structural parameters (track modulus, stress-free temperature, critical speed) from this combined data, eliminating the need for separate measurement campaigns for each parameter.
Solution Approach 2:
The measurement system is designed to perform multiple functions: it can determine various structural parameters including track modulus, stress-free temperature, and critical speed all through a single measurement process. The same sensor array and processor configuration serves multiple measurement purposes simultaneously.
2Measurement precision
If multiple separate measurement methods are used to determine different structural parameters, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple measurement functions into a single integrated system. The sensor array simultaneously measures deflection shapes under different loads, and the processor determines multiple structural parameters (track modulus, stress-free temperature, critical speed) from this combined data, eliminating the need for separate measurement campaigns for each parameter.
Solution Approach 2:
The measurement system is designed to perform multiple functions: it can determine various structural parameters including track modulus, stress-free temperature, and critical speed all through a single measurement process. The same sensor array and processor configuration serves multiple measurement purposes simultaneously.
3Productivity
If traditional single-parameter measurement methods are used, then device complexity is reduced, but productivity decreases
Solution Approach 1:
The measurement system is designed to perform multiple functions: it can determine various structural parameters including track modulus, stress-free temperature, and critical speed all through a single measurement process. The same sensor array and processor configuration serves multiple measurement purposes simultaneously.
Solution Approach 2:
The system performs continuous measurement as the measurement vehicle travels along the track. The sensor array continuously captures deflection data, and the processor continuously determines structural parameters, enabling efficient along-track monitoring without stopping or repeated measurements at the same location.
4Measurement precision
If destructive measurement methods are used, then measurement precision is improved, but reliability of the track decreases
Solution Approach 1:
The patent replaces destructive mechanical measurement methods with non-contact or minimal-contact sensor-based measurement. The sensor array measures deflection shapes without physically altering the track structure, and the processor derives structural parameters from these measurements, maintaining track integrity while achieving accurate parameter determination.
Data Source
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AI summary
The invention relates to a method for determining structural parameters of a railway track comprising a sensor array. The method comprises measuring at least the vertical and/or lateral irregularities of said rail with the sensor array along the rail, thereby providing signals corresponding to the geometrical irregularities at different distance from the wheel-load. A model is provided describing the deflection shape of a rail, wherein the deflection shape is dependent on structural parameters of the rail and on the loads on the rail, said model being stored in the processor. In the processor said geometrical irregularities are compared under different load influence for generating a measured deflection shape. At least one theoretical rail deflection shape is generated using the model by varying the structural parameters and the load in the model. At least one of said theoretical deflection shapes is compared with said measured deflection shape for each point of the rail, and the structural parameters of that theoretical deflection shape which best matches said measured deflection shape are determined. An apparatus configured to perform the method is also provided.