Flat Plate Energy Absorption Element for Vehicle Roof
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Solution Overview
Problem
Existing vehicle roofs have a high need for space due to energy absorption elements and require improvement in accident behavior, particularly in decelerating occupants during impacts.
Innovation Solution
A vehicle roof design featuring an essentially flat plate energy absorption element coupled to a lining element, which decelerates occupants through back-and-forth springing, reducing acceleration and providing improved accident protection with minimal space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If foam elements are used as energy absorption elements, then energy absorption capability is improved, but space requirement increases significantly
Solution Approach 1:
The patent employs a thin metallic plate element instead of bulky foam elements. The plate element utilizes elastic deformation and kinetic energy conversion during impact to absorb energy, achieving effective energy absorption with minimal space occupation. The plate's flexibility allows it to deform and rebound, creating multiple impact cycles that dissipate impact energy efficiently.
2Reliability
If traditional energy absorption elements are used, then occupant protection is provided, but device complexity and space consumption increase
Solution Approach 1:
The patent extracts only the essential energy absorption function from complex foam structures and implements it through a simple metallic plate element. The plate element, coupled directly to the lining element, provides occupant protection through its dynamic response to impact forces, eliminating the need for complex multi-component energy absorption systems.
Solution Approach 2:
The patent changes the physical state and material properties from compressible foam to elastic metallic plate. The plate element's elastic modulus, thickness, and material composition are optimized to achieve appropriate energy absorption characteristics, transforming the protection mechanism from compression-based to elastic deformation and kinetic energy conversion-based.
3Loss of energy
If foam material is used for energy absorption, then impact energy is absorbed, but weight and space requirements increase
Solution Approach 1:
The patent replaces the static compression mechanism of foam materials with a dynamic mechanical system based on elastic deformation and kinetic energy conversion. The metallic plate element converts impact energy into kinetic energy of the plate itself, which then dissipates through multiple rebound cycles, achieving energy absorption with significantly reduced weight compared to foam materials.
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 flat plate energy absorption element effectively decelerates occupants by applying opposing forces, reducing head acceleration and displacement, thereby enhancing safety and reducing the need for space, while being lightweight and cost-effective.
Implementation Method 1
the plate element springs initially away from the head, in particular the lining element, and subsequently as a consequence of the coupling to the lining element once again onto the head. This sequence of events occurs in only a very short amount of time and is repeated many times over a very short period of time so that the plate element springs back and forth
Implementation Method 2
opposing impetuses can be applied to the occupant or her/his head by means of the plate element through back-and-forth springing of the plate element
Data Source
AI summary
A roof for a motor vehicle includes at least one roof element, at least one lining element by which the roof element is lined at least partially towards a passenger compartment of the motor vehicle, and at least one energy absorption element coupled to the lining element for at least partially decelerating an occupant impacting the energy absorption element at least indirectly during an accident-related application of force. The energy absorption element is formed as an essentially flat plate element.