Vehicle Seat Impact Absorption via Guided Rod Kinematics
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Solution Overview
Problem
Current impact absorption systems in vehicles are inadequate in managing impact energy, particularly in seat systems, which can be life-threatening during collisions.
Innovation Solution
A device comprising a vertical support, energy-absorbing elements hingedly connected to the seat and support, and geometrically positioned rods that guide relative motion to direct impact energy absorption, utilizing various energy absorption methods such as plastic deformation and electromagnetic dampers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional impact absorption systems are used in vehicle seats, then the structure is simple, but the impact energy absorption capability is insufficient and can be life-threatening
Solution Approach 1:
The impact absorption system is divided into multiple independent components: energy absorbing elements (such as deformable rods or springs), guiding rods, hinges, and a vertical support structure. Each component performs a specific function - the energy absorbing elements dissipate impact energy through controlled deformation, while the guiding rods and hinges direct the motion path. This segmentation allows the system to achieve high reliability in impact absorption while maintaining reasonable complexity through modular design.
2Reliability
If energy absorbing elements are added to the seat system, then impact energy absorption is improved, but the device complexity increases
Solution Approach 1:
The guiding rods serve multiple functions: they geometrically guide the relative motion of the seat with respect to the vertical support, they transmit forces between components, and they structurally connect different parts of the system. The hinges provide both rotational movement capability and structural connection. This multi-functionality reduces the need for additional specialized components, thereby improving impact energy absorption while limiting the increase in device complexity.
3Reliability
If rods are positioned to geometrically guide relative motion, then impact energy direction is controlled, but manufacturing precision requirements increase
Solution Approach 1:
The system uses hinges to create dynamic rotational joints between the guiding rods, seat, and vertical support. This allows the rod positions to adjust automatically during impact events, accommodating variations in impact direction and magnitude. The geometric guidance is achieved through the kinematic constraints of the hinged connections rather than through precisely fixed rod positions, thereby reducing manufacturing precision requirements while maintaining reliable impact energy direction control.
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
Effectively absorbs and redirects impact energy to minimize force on the seat and passenger, enhancing safety by optimizing energy absorption and distributing forces anatomically, thus reducing injury risk during impacts.
Implementation Method 1
utilizing various energy absorption methods such as plastic deformation
Implementation Method 2
utilizing various energy absorption methods such as plastic deformation and electromagnetic dampers
Data Source
AI summary
Impact absorption devices and methods for a vehicle's seat are provided. Devices comprise vertical support(s), energy absorbing element(s) hingedly connected to the seat and hingedly connected to the vertical support; and at least four rods hingedly connected to the seat and hingedly connected to the vertical support. The rods are positioned to geometrically guide a relative motion of the seat with respect to the vertical support upon impact, and to direct the impact energy absorption by the energy absorbing element(s). The rods may be configured according to prevailing spatial relations and required energy absorption with respect to expected intensities and directions of impacts. The devices may be configured with any energy absorption element(s), may be augmented by vibration damping or implemented using electromagnetic dampers.