Crash Attenuator Transition Assembly for Rigid Yet Flexible Barrier Joints
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Solution Overview
Problem
Existing crash attenuators face challenges in securely attaching to fixed structures while meeting stringent safety standards, particularly when accommodating both heavy and light vehicles, and redirecting vehicles obliquely impacted sides, without exceeding deceleration limits.
Innovation Solution
A transition system with a tapered plate and reinforcement ribs, designed to fit flush with fixed structures, secured by mechanical fasteners or welds, allowing adaptable attachment and enhanced structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rigid connection methods are used to join impact attenuator systems to fixed structures, then structural strength is improved, but the system becomes vulnerable to impact forces and cannot accommodate movement
Solution Approach 1:
The patent employs flexible connection assemblies with bellows-like structures that provide both structural strength and flexibility. These flexible connections allow the attenuator system to accommodate impact forces and movement while maintaining a secure joint to the fixed structure, resolving the contradiction between rigidity and impact resistance.
Solution Approach 2:
The connection assembly changes its structural parameters dynamically - remaining rigid under normal conditions for strength, but becoming flexible during impact events. The bellows structure can expand and contract, changing its stiffness parameter to accommodate different operational states, thus resolving the contradiction between structural strength and impact resistance.
2Ease of manufacture
If rigid connections are used, then installation simplicity is improved, but the system cannot accommodate thermal expansion, contraction, or movement
Solution Approach 1:
The connection assembly transitions from a static rigid connection to a dynamic flexible connection that can adapt to thermal expansion, contraction, and movement. The bellows structure inherently provides this dynamic capability while maintaining ease of installation through a standardized connection design that integrates both rigidity and flexibility.
3Stability of the object's composition
If rigid connections are used, then structural stability is improved, but impact forces are transferred to the fixed structure causing potential damage
Solution Approach 1:
The flexible connection assembly acts as an intermediary between the impact attenuator system and the fixed structure. It provides a stable connection while simultaneously absorbing and isolating impact forces, preventing their direct transfer to the fixed structure. This mediator role resolves the contradiction between structural stability and impact force transfer.
Solution Approach 2:
The flexible connection converts the harmful impact forces into beneficial controlled deformation of the bellows structure. The impact energy is absorbed through the flexible connection's deformation rather than being transmitted to the fixed structure, thus converting a harmful effect into a protective mechanism while maintaining structural stability.
Data Source
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AI summary
A transition system for connecting a crash attenuator to a roadside fixed structure, such as a concrete traffic barrier, includes a plate adapted to securely attach to a desired location on the fixed structure, the plate having a flat surface adapted to correspond to a flat surface on the fixed structure, and being reinforced by a plurality of backing ribs for strength.