Crash Attenuator Assemblies with Visual Compression Indicators
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Solution Overview
Problem
Existing vehicle crash attenuators, particularly those designed for low-traffic and lower-speed roadways, often exceed budget constraints due to high initial investment costs for fully-resettable models, and sacrificial energy dissipation devices require additional time and replacement components for maintenance.
Innovation Solution
The development of crash attenuator assemblies that incorporate guide rails, frame assemblies, and compressible energy absorbers, including energy absorption cartridges with a polymeric foam material and a piercing device to visually indicate compression, allowing for efficient energy dissipation and reduced maintenance costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If fully-resettable crash attenuators are used, then the attenuator can be quickly reset at minimal cost, but the initial investment cost is substantial and exceeds budget limitations
Solution Approach 1:
The crash attenuator is divided into modular components: reusable frame assemblies mounted on guide rails and replaceable sacrificial energy dissipation devices. This segmentation allows the expensive structural components to be reused while only replacing the cheaper energy-absorbing elements, reducing both initial investment and maintenance costs.
Solution Approach 2:
The patent implements a hybrid approach where the frame assemblies and guide rails are recovered and reused, while the energy dissipation devices are discarded after use. This selective recovery strategy maintains the reset capability of fully-resettable systems while reducing the quantity of materials that need to be replaced, thereby lowering costs.
2Quantity of substance
If sacrificial energy dissipation devices are used, then the initial investment cost is reduced, but additional time and replacement components are required for maintenance
Solution Approach 1:
By segmenting the energy dissipation system into discrete, pre-assembled cartridges that can be quickly swapped between frame assemblies, the maintenance process is streamlined. The modular design allows maintenance personnel to replace energy dissipation devices without disassembling the entire attenuator structure, significantly reducing maintenance time.
Solution Approach 2:
The patent enables rapid replacement of sacrificial energy dissipation devices while recovering and reusing the expensive frame assemblies and guide rails. This approach minimizes the loss of time by focusing replacement efforts only on the consumable components rather than the entire system.
3Loss of energy
If compressible cartridges are used between frame assemblies, then energy dissipation is achieved, but the cartridges require replacement after impact events
Solution Approach 1:
The energy dissipation function is segmented into discrete cartridges positioned between frame assemblies. Each cartridge is a self-contained unit that can be independently replaced, simplifying the repair process. The segmentation allows maintenance to be performed on individual cartridges rather than the entire energy dissipation system.
Solution Approach 2:
The patent implements a strategy where the sacrificial cartridges are discarded after absorbing impact energy, while the frame assemblies are recovered and prepared for future use. This approach balances energy dissipation performance with maintenance efficiency by replacing only the consumable components.
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
These crash attenuator assemblies effectively decelerate errant vehicles while reducing installation and maintenance costs, making them more accessible to municipalities with budget constraints without compromising performance.
Implementation Method 1
compressible energy absorbers... including energy absorption cartridges with a polymeric foam material
Implementation Method 2
compressible energy absorbers... operative to penetrate into the compressible energy absorber
Data Source
AI summary
Crash attenuator assemblies are operable to decelerate errant vehicles traveling along roadways. The crash attenuator assemblies include guide rails anchorable to a ground surface adjacent a roadway. Frame assemblies are supported on the guide rails and are displaced upon impact by errant vehicles. The frame assemblies are spaced longitudinally along the guide rail such that a bay is defined between adjacent ones of the frame assemblies. A compressible energy absorber is disposed within one of the bays. A piercing device is operative to penetrate into said compressible energy absorber upon compression of the compressible energy absorber during an impact event to create an aperture that is a visually observable identifier of compression of the compressible energy absorber beyond a predetermined compression threshold.