Rail Strain Sensor Adhesive Mounting
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Solution Overview
Problem
Conventional methods for mounting rail monitoring members, such as axle counters, are costly and weaken the rail, and are unsuitable for accurate measurement of elastic deformation caused by trains due to punctual fixing, which is not suitable for fiber optic sensors.
Innovation Solution
A method involving temperature-controlled adhesive fixing of a carrier with a strain gauge, such as an optical fiber with a fiber Bragg grating, using heat-activated surface members or two-component bonding agents to achieve a two-dimensional frictional connection that enhances sensor performance and prevents rail damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw or clamp connections are used to mount rail monitoring members, then the monitoring member can be fixed to the rail, but the rail is weakened and the position cannot be easily changed
Solution Approach 1:
The patent replaces mechanical connection systems (screws, clamps) with a chemical bonding system using adhesive. The adhesive is applied to the mounting surface and cures to form a strong bond between the carrier and rail, eliminating the need for mechanical fasteners that would create stress concentrations and weaken the rail structure.
Solution Approach 2:
The patent controls the temperature parameter during the adhesive bonding process to optimize curing and bond strength. By maintaining specific temperature conditions, the adhesive achieves optimal bonding properties without requiring mechanical fastening, thus preserving rail integrity while ensuring reliable mounting.
2Ease of manufacture
If punctual fixing is used for fiber optic sensors, then the sensor can be mounted, but elastic deformation caused by trains cannot be measured with necessary accuracy
Solution Approach 1:
The patent transitions from punctual (point-based) fixing to surface-based fixing by applying adhesive over an extended mounting surface area. This dimensional expansion allows the fiber optic sensor to be bonded across a larger area of the rail, enabling accurate measurement of elastic deformation while maintaining simple mounting procedures.
Solution Approach 2:
The patent applies adhesive to the mounting surface before mounting the carrier, allowing the adhesive to begin curing and establish a strong bond. This preliminary action ensures that the sensor is properly positioned and secured, enabling accurate strain measurement without complex mounting procedures.
3Productivity
If conventional bonding processes are used for mounting rail monitoring members, then the mounting can be executed, but the process is inhibited by extreme weather conditions and takes too long
Solution Approach 1:
The patent controls temperature as a critical parameter during the adhesive bonding process. By maintaining optimal temperature conditions, the adhesive cures properly regardless of external weather conditions, ensuring reliable bonding while accelerating the curing process to reduce mounting time and minimize rail traffic disruption.
Solution Approach 2:
The adhesive acts as an intermediary substance between the carrier and rail, creating a controlled bonding environment that is independent of external weather conditions. The adhesive formulation and application process are designed to cure reliably under controlled conditions, insulating the bonding process from environmental variations and enabling faster execution.
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 and safe monitoring of rail conditions with minimal disruption to rail traffic, allowing for faster installation and preventing manipulation or sabotage, while maintaining sensor accuracy and rail integrity.
Implementation Method 1
Positioning and fixing of the carrier of the rail monitoring member at the mounting location, wherein the fixing is carried out adhesively
Implementation Method 2
Determination of the temperature of the rail and/or the rail monitoring member at the mounting location; Check whether the determined temperature is within a predefined temperature interval; Heat or cooling application to the rail and/or rail monitoring member at the mounting location
Data Source
AI summary
A method of mounting a rail monitoring member/element at a mounting location of a rail for rail traffic, in particular on a railway track, is disclosed. The rail monitoring member includes a strain sensor member with a carrier on which a strain gauge, being an optical fiber with a fiber Bragg grating, is fixed. The method steps include: determination of the temperature of the rail and/or rail monitoring member at the mounting location; checking whether the determined temperature is within a predefined temperature interval; providing heating or cooling application to the rail and/or rail monitoring member at the mounting location, if the determined temperature is not within the predefined temperature interval; positioning and adhesively fixing of the carrier of the rail monitoring member at the mounting location. The method can be carried out easily and allows reliable and accurate monitoring of the rail using a strain sensor member.