Rail Web Fiber-Optic Load Detection
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Solution Overview
Problem
Existing overload and unbalanced load detection systems for railways face challenges such as structural damage, high costs, and electromagnetic interference, particularly due to the need for specialized rail sleepers and sensors that require extensive construction and are vulnerable to electromagnetic interference.
Innovation Solution
The system employs fiber-optic sensitive elements obliquely fixed at sampling points on the neutral axis of steel rails, disposed at 90° angles to each other, which collect shear-stress waveforms without drilling holes and using cold spot welding, eliminating the need for specialized rail sleepers and reducing construction requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional strain gauge sensors are used with specially made rail sleepers, then measurement accuracy is improved, but construction complexity and cost increase significantly
Solution Approach 1:
The patent extracts the sensing function from the complex sleeper structure and integrates it directly into the existing steel rail web. By mounting shear-stress sensors and plate-mode sensors directly on the rail web at specific positions, the system eliminates the need for specially made sleepers while maintaining measurement accuracy. This extraction principle simplifies the overall device complexity by removing unnecessary structural components.
Solution Approach 2:
The steel rail web is made to serve multiple functions: it acts as both the structural support element and the mounting substrate for the sensing system. By utilizing the existing rail web for sensor mounting, the patent eliminates the need for separate specialized sleepers, thereby reducing construction complexity while maintaining the structural integrity and measurement capabilities of the system.
2Ease of manufacture
If holes are drilled at the rail web for sensor mounting, then sensor installation is enabled, but structural strength of the steel rail deteriorates
Solution Approach 1:
The patent employs preliminary action by pre-processing the rail web surface through methods such as sandblasting, grinding, or chemical treatment before sensor mounting. This surface preparation creates optimal bonding conditions that enable strong adhesion without requiring holes or mechanical fasteners, thereby maintaining the structural strength of the rail while enabling easy sensor installation.
Solution Approach 2:
The patent replaces mechanical connection methods (such as drilling holes and using fasteners) with chemical bonding methods using high-strength adhesives or epoxy resins. This substitution eliminates the need to compromise the rail's structural strength through hole drilling, while still providing secure sensor mounting. The chemical bonding method maintains the integrity of the rail web while enabling effective sensor installation.
3Difficulty of detecting and measuring
If conventional electrical sensors are used, then detection capability is achieved, but resistance to electromagnetic interference decreases
Solution Approach 1:
The patent replaces conventional electrical sensors that are susceptible to electromagnetic interference with fiber-optic sensors that use optical signals. The fiber-optic sensing system measures strain and stress through changes in light properties (such as Brillouin scattering or phase modulation) rather than electrical signals, providing inherent immunity to electromagnetic interference while maintaining full detection capability for rail load monitoring.
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
This configuration enhances detection accuracy, reduces construction costs, and improves resistance to electromagnetic interference while maintaining the structural integrity of the steel rails.
Implementation Method 1
a fiber-optic sensitive element used for continuously measuring a load is obliquely fixed at each sampling point
Implementation Method 2
the shear-stress sensor is used as an axle counting tool and an auxiliary weighting means
Data Source
AI summary
This application relates to an overload and unbalanced load detecting system for a railway and a detecting method. This system includes at least one steel rail. A rail web of each steel rail is provided with two sampling points at two sides between every two adjacent rail sleepers, respectively, and the two sampling points on one side are symmetrically disposed about the steel rail with respect to the two sampling points on the other side. A fiber-optic sensitive element used for continuously measuring a load when a train passes through the two sampling points is obliquely fixed at each sampling point, and two fiber-optic sensitive elements on the same side of each steel rail are disposed at an angle of 90° with each other.