Display Mounting System Structural Fuse HIC Reduction
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Solution Overview
Problem
Passenger head injuries in aircraft accidents are exacerbated by the rigidity of display monitors mounted on seatbacks or bulkheads, which can lead to severe HIC values and increased risk of injury due to the monitors' inability to absorb impact without shattering or exposing sharp edges.
Innovation Solution
The implementation of a structural fuse in the fasteners used to mount display monitors, which deforms and fractures under impact force, allowing the monitor housing to move relative to the structure and reducing the impact force experienced by passengers, thereby maintaining HIC values below 1000 and preventing sharp edges from forming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If display monitors are mounted with rigid fasteners to securely hold the display, then the display remains stable and secure during normal operation, but the HIC value increases and the risk of head injury increases during sudden deceleration
Solution Approach 1:
The fastening system transitions from a static rigid connection to a dynamic system that adapts to impact conditions. The structural fuse remains intact during normal operation to secure the display, but deforms or fractures under impact force to allow the display to move and reduce HIC values.
Solution Approach 2:
The mechanical properties of the fastening system change based on applied force. During normal operation, the fastener maintains high stiffness to secure the display. During impact, the structural fuse deforms or fractures, changing the system from rigid to compliant, thereby reducing the force transmitted to the passenger's head.
2Object-affected harmful factors
If display monitors are made less rigid to reduce HIC values, then the impact force is reduced, but the display undergoes substantial deformation and causes brittle material such as glass to break and leave sharp edges exposed
Solution Approach 1:
The sacrificial element (structural fuse) is extracted from the display assembly itself and placed in the fastening system. This allows the display to remain rigid and intact while the separate structural fuse component absorbs the deformation and energy dissipation, preventing both HIC increase and display shattering.
Solution Approach 2:
The structural fuse is designed as a disposable sacrificial element that is intended to fail during impact events. It is replaced after deployment if fractured, while the expensive display unit itself remains intact and reusable.
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 structural fuse effectively reduces the risk of severe head injuries by absorbing impact forces and preventing sharp edges from forming, thus meeting safety standards while allowing the use of more rigid display materials.
Implementation Method 1
The fastener includes a structural fuse that deforms under force generated by a passenger's head striking the electronic visual display panel in an accident and reduces impact force
Implementation Method 2
the structural fuse effectively reduces the risk of severe head injuries by absorbing impact forces and preventing sharp edges from forming
Data Source
AI summary
A display for viewing by a passenger from a seat on a vehicle when the display is mounted to structure in front of the passenger when the passenger is seated in the seat. The structure has a recess and a portion surrounding the recess. The display includes an electronic visual display panel for receiving a display signal and displaying information in correspondence therewith to the passenger on the electronic visual display panel. The display further includes a housing in which the electronic visual display panel is mounted or inserted, with the housing including a periphery. At least one fastener is provided including a structural fuse. The structural fuse deforms and/or fractures under force generated by a passenger's head striking the visual display panel in an accident. Due to crumple of the fuse, movement of the housing is permitted, with the display panel inserted therein, relative to the recess.