Multi-Stage Ride-Down Pad for Child Seat Impact Energy Dissipation
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Solution Overview
Problem
Child-restraint systems in vehicles fail to effectively absorb and dissipate external impact forces, leading to excessive acceleration and g-loads experienced by children during collisions, which can cause discomfort and injury.
Innovation Solution
An energy-dissipation system comprising a multi-stage ride-down pad with air-discharge vessels and deformable support frames, designed to absorb external energy by metered air discharge through strategically positioned ports, minimizing the transfer of impact forces to the child.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional rigid structures are used in child-restraint systems, then structural strength is maintained, but impact forces are not effectively absorbed leading to excessive g-loads on children
Solution Approach 1:
The restraint system is divided into multiple independent force dissipaters (first, second, and third force dissipaters) that can deform and absorb energy independently. Each force dissipater contains air chambers that can be compressed separately, allowing progressive energy absorption while maintaining overall structural integrity through the network of energy-absorbing elements.
Solution Approach 2:
The system uses air-filled chambers whose compressibility and energy-absorption characteristics can be adjusted by changing parameters such as chamber volume, air pressure, and chamber geometry. The deformable support frames can be designed with varying degrees of flexibility to control the deformation rate and energy dissipation characteristics under different impact conditions.
2Loss of energy
If air chambers are made highly deformable to absorb energy quickly, then energy absorption is improved, but the ride-down time is reduced which can cause discomfort
Solution Approach 1:
The energy absorption process is segmented into multiple stages through the network of force dissipaters. The first force dissipater absorbs initial impact energy, followed by the second and third force dissipaters that continue energy absorption as deformation progresses. This staged approach extends the overall ride-down time while maintaining effective energy dissipation.
Solution Approach 2:
The air discharge ports create a periodic or progressive energy dissipation mechanism as air is gradually expelled from the chambers during deformation. The metered air discharge rate ensures that energy is absorbed in a controlled, progressive manner rather than all at once, extending the duration of energy absorption while maintaining effectiveness.
3Loss of energy
If air is discharged rapidly from the air chamber, then energy dissipation is improved, but the ride-down time is minimized causing discomfort to the child
Solution Approach 1:
The air discharge ports are designed to meter the air discharge rate, creating a controlled, progressive release of air from the chambers. This periodic or controlled discharge mechanism ensures that energy is dissipated over an extended period rather than in a single rapid burst, maintaining effective energy dissipation while extending ride-down time for child comfort.
Solution Approach 2:
The air discharge rate is controlled by adjusting parameters such as port size, port geometry, and chamber pressure. These parameter changes allow optimization of the balance between energy dissipation rate and ride-down time, ensuring that air is discharged fast enough to absorb impact energy but slow enough to maintain comfort.
4Loss of energy
If the vessel deforms too quickly under impact, then immediate energy absorption occurs, but the ride-down time is reduced and comfort is compromised
Solution Approach 1:
The deformation process is segmented across multiple force dissipaters and air chambers that deform in sequence or in parallel at different rates. This segmentation allows the overall system to absorb energy progressively rather than through a single rapid deformation event, extending ride-down time while maintaining effective energy absorption.
Solution Approach 2:
The system uses dynamically deformable structures including air-filled chambers and deformable support frames that adjust their deformation characteristics in response to applied loads. The air chambers provide progressive resistance to compression as they deform, automatically adjusting the deformation rate to extend ride-down time while maintaining energy absorption effectiveness.
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 energy-dissipation system significantly reduces g-loads and maximizes ride-down time, providing enhanced safety and comfort for children by effectively absorbing and dissipating external impact forces, thereby minimizing the impact's severity.
Implementation Method 1
a vessel for holding air or other fluid in an air chamber until the vessel is deformed when exposed to an external impact force. External energy is absorbed as air is discharged from the air chamber of the vessel
Implementation Method 2
Air extant in the air chamber is discharged through the air-discharge port when the vessel is exposed to an external impact force
Implementation Method 3
The deformable support frame provides means for supporting the vessel to maintain at least a predetermined volume of air in the air chamber until the vessel is deformed when exposed to an external impact force
Implementation Method 4
An external impact force will strike and deform the second force dissipater in a first stage and this will lead to deformation of the first force dissipater in a second stage so as to absorb external energy associated with the external impact force
Data Source
AI summary
A child restraint includes a juvenile vehicle seat and an energy-absorption apparatus coupled to the juvenile vehicle seat. The energy-absorption apparatus is configured to absorb external energy associated with an external impact force applied to the energy-absorption apparatus.