Guardrail Slider Assembly for Impact Energy Absorption
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Solution Overview
Problem
Guardrail terminal ends pose a significant risk to vehicle occupants in head-on collisions due to their inability to effectively absorb impact energy, similar to collisions with stationary objects like trees or power poles.
Innovation Solution
A slider assembly with a front section conforming to the cross-sectional profile of guardrail rails, creating an internal space to surround multiple rails, and featuring opposed portions that move to apply increasing compressive force through telescoping, acting as a friction brake to absorb impact energy during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional guardrail terminal end is used, then the structure is simple and easy to manufacture, but it cannot effectively absorb impact energy and poses significant risk to vehicle occupants
Solution Approach 1:
The slider assembly is divided into multiple functional sections: a front section with opposed portions that contact the rails, a middle section with the compression element, and a back section. This segmentation allows each part to perform its specific function efficiently while contributing to the overall energy absorption capability of the terminal end.
Solution Approach 2:
The slider assembly incorporates movable components including the compression element that can be compressed during impact, and the opposed portions that can move along the rails. This dynamic design enables the structure to adapt to impact forces and absorb energy through controlled deformation and movement, transforming the static guardrail into an active energy absorption system.
2Loss of energy
If a slider assembly with moving opposed portions is used to apply compressive force, then impact energy is effectively absorbed, but the device complexity increases
Solution Approach 1:
The compression element is configured to automatically compress under impact forces without requiring external control systems. The movement of the slider assembly along the rails naturally activates the compression mechanism, which dissipates impact energy through controlled deformation. This self-activating mechanism reduces the need for complex control systems while maintaining effective energy absorption.
Solution Approach 2:
The impact force, which is harmful to vehicle occupants, is converted into a beneficial compressive force on the compression element. The slider assembly transforms the kinetic energy of the impacting vehicle into deformation energy of the compression element, effectively dissipating the harmful impact energy in a controlled manner that protects occupants.
3Reliability
If the slider assembly travels along subsequent rails during telescoping, then compressive force is applied to absorb energy, but the manufacturing precision requirements increase
Solution Approach 1:
The front section of the slider assembly has opposed portions with specific geometric profiles that match the rail cross-section. This local quality match ensures proper contact and force application at the critical interface between the slider and rails, while the rest of the assembly can use more standard manufacturing tolerances. This approach maintains energy absorption effectiveness without requiring ultra-precise manufacturing throughout the entire assembly.
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 slider assembly effectively decelerates vehicles by applying a progressively increasing clamping force, reducing the risk of injury by absorbing impact energy and maintaining rail alignment during side impacts.
Implementation Method 1
the slider assembly is configured so that the first and second opposed portions can move with respect to each other so the slider assembly can, in use, apply an increasing compressive force to telescoping rails as a consequence of the slider assembly travelling along one or more subsequent rail(s) during telescoping
Data Source
AI summary
A slider assembly including a front section, and a back section, where the front section is adapted to conform to the cross sectional profile of rails forming the terminal end of a guardrail, or other barrier, to which the slider assembly will be fitted in use. The front section in combination with the back section create an internal space therebetween capable of substantially surrounding both an associated first rail and an associated second rail of the terminal end, and at least two further rails located downstream of the first and second rail. The slider assembly includes first and second opposed portions configured to move with respect to each other so the slider assembly can, in use, apply an increasing compressive force to telescoping rails as a consequence of the slider assembly travelling along one or more subsequent rail(s) during telescoping.