Aircraft Seatback Bezel Motion for HIC-Compliant Seating Density
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing passenger aircraft seat designs face a challenge in balancing weight reduction and increased seating capacity with compliance to Head Injury Criterion (HIC) regulations, often requiring wide spacing or breakover mechanisms that limit seating arrangements.
Innovation Solution
A passenger seat with a bezel and slide mechanism that translates relative to the seatback upon detecting an emergency event, creating a crushable space using an impact attenuator to absorb energy and mitigate head impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If seats are spaced far apart to prevent head contact, then passenger safety (HIC compliance) is improved, but seating capacity and cabin efficiency deteriorate
Solution Approach 1:
The bezel is designed to be movable rather than fixed, translating forward upon impact to dynamically create crushable space. This dynamic response allows seats to be positioned closer together while still meeting HIC requirements when impact occurs.
Solution Approach 2:
The slide mechanism is pre-configured to translate the bezel forward automatically upon detection of impact forces, preparing the crushable space in advance of actual head contact. This preliminary action occurs too quickly for human reaction but ensures safety compliance.
2Reliability
If breakover mechanisms are built into seats to manage impact loads, then HIC compliance is improved, but device complexity and weight increase
Solution Approach 1:
The bezel acts as an intermediary element between the seat structure and the passenger's head. It translates forward to create crushable space and works with the impact attenuator to manage impact loads, distributing forces through the slide mechanism and pivot connection.
Solution Approach 2:
The system changes the physical state and position of the bezel from a fixed component to a movable one that translates forward under impact. This parameter change (position, velocity) creates the necessary crushable space dynamically rather than requiring a complex pre-configured breakover mechanism.
3Object-affected harmful factors
If impact attenuators are added to absorb energy, then head injury mitigation is improved, but weight of the seat increases
Solution Approach 1:
The impact attenuator is integrated within the existing seat structure, nested between the bezel and seatback. This nesting approach allows energy absorption functionality to be added without significantly increasing overall seat volume or weight, as the attenuator utilizes existing structural space.
Solution Approach 2:
The impact attenuator likely employs composite material structures that provide high energy absorption capacity relative to their weight. These materials can dissipate impact energy through deformation while maintaining a weight-efficient design compared to traditional energy absorption systems.
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 system effectively reduces head injury risk by increasing the crushable space and managing head impact loads without increasing seat width, thus enhancing safety while maintaining seating density.
Implementation Method 1
an accelerometer configured to generate a signal in response to detecting an acceleration indicative of an emergency event
Implementation Method 2
The impact attenuator is configured to absorb an energy upon impact of the passenger with the bezel
Implementation Method 3
absorb the energy upon the impact of the passenger with the bezel
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
A passenger seat is described which satisfies a head-injury criterion (HIC). To satisfy the HIC, the passenger seat translates or pivots one or more components of the seatback (104) towards a passenger sitting behind the passenger seat. By translating and/or pivoting the components of the seatback (104) towards the passenger, a crush zone for the passenger seat may be increased, thereby increasing the impact time and correspondingly decreasing the forces felt by the passenger.