Railroad Signal Wind Guide Elements for Load Reduction
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Solution Overview
Problem
Railroad signals, particularly color light signals, face damage from high wind loads due to their elevated positions, which can cause structural issues and affect visibility by allowing air to circulate and create pressure differences that increase wind forces.
Innovation Solution
Incorporating a protection device with a snow shield and wind guide elements, such as transparent wind guides and rear wind guides, to create external or internal air paths that reduce wind loads by guiding air flow around and through the signal head, thereby minimizing damage and maintaining visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the signal is positioned high in the air (10-40 feet above ground) to ensure visibility, then the signal can be seen from a far distance, but it experiences larger wind loads that may result in damage to the signal or support structure
Solution Approach 1:
The patent converts the harmful wind flow into a beneficial aerodynamic feature by designing the snow shield with a curved, aerodynamic shape that guides wind flow smoothly around the signal housing. The curved surface redirects wind from the front and back, creating a low-pressure zone that reduces overall wind load on the structure while maintaining signal visibility at elevated positions
2Illumination intensity
If a snow shield is used to block sunlight and protect the signal, then the colored lights can be seen from a far distance, but the snow shield creates a solid surface that increases wind load on the signal
Solution Approach 1:
The patent applies curvature to the snow shield by designing it with a rounded, aerodynamic profile rather than a flat surface. The curved front surface and tapered rear surface allow wind to flow smoothly around the signal housing, reducing turbulence and pressure differential. This curved geometry maintains the snow shield's function of blocking sunlight while dramatically reducing wind load through aerodynamic flow management
3Strength
If the snow shield enclosed area is solid to protect internal components, then the signal housing is protected, but air circulation creates pressure differences that increase wind forces
Solution Approach 1:
The patent extracts or removes the solid enclosure concept by designing the snow shield with an open, aerodynamic shape that does not fully enclose the signal housing. Instead of a solid box structure, the snow shield acts as a streamlined fairing that protects the front and sides while allowing wind to flow around and through the structure, eliminating the pressure differential that would occur with a fully enclosed solid design
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
The solution effectively reduces wind forces on railroad signals by 10% to 40% in major wind directions, preventing damage and ensuring the signals remain visible and functional.
Implementation Method 1
Incorporating a protection device with a snow shield and wind guide elements, such as transparent wind guides and rear wind guides, to create external or internal air paths that reduce wind loads by guiding air flow around and through the signal head
Implementation Method 2
allowing air to circulate and create pressure differences that increase wind forces
Data Source
AI summary
A railroad signal includes a mounting bracket and a signal head, the signal head being mounted to another structure by the mounting bracket, wherein the signal head includes a signal housing, a plurality of signal lights positioned in the signal housing, and a protection device for reducing or eliminating wind forces, the protection device comprising a snow shield and at least one wind guide element.