Ratchet-Actuated Piston Fixture for Vehicle Rollover Simulation
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Solution Overview
Problem
Current vehicle rollover simulation methods do not accurately replicate the deformation of the vehicle's exterior components, such as the B-pillar, during a rollover event, which affects the movement of seat belt components like the D-ring, limiting the realism of safety tests while protecting the vehicle's exterior for repeated use.
Innovation Solution
A testing fixture with a piston and ratchet mechanism is integrated into the simulation setup, allowing the piston to extend and lock in place to simulate the deformation of the B-pillar, thereby moving the D-ring and accurately replicating the deformation-induced movement of seat belt components during a rollover simulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the vehicle is placed in a cage for rollover simulation, then the exterior of the vehicle is protected from damage, but the deformation of exterior components such as the B-pillar is not simulated
Solution Approach 1:
A testing fixture acts as an intermediary component between the cage and the seat belt D-ring. The fixture includes a pillar portion that simulates B-pillar deformation and a D-ring portion that moves relative to it, mediating the transmission of deformation effects to the seat belt system without requiring actual exterior damage to the vehicle
Solution Approach 2:
The testing fixture creates a simplified copy of the B-pillar and D-ring assembly. The pillar portion replicates the deformation characteristics of the actual B-pillar, and the D-ring portion replicates the movement behavior of the seat belt D-ring, allowing accurate simulation without using the actual vehicle exterior components
2Productivity
If the vehicle exterior is protected during simulation, then the vehicle can be re-used for repeated tests, but the movement of seat belt components due to B-pillar deformation is not replicated
Solution Approach 1:
The testing fixture serves as a mediator that transfers the simulated B-pillar deformation motion to the seat belt D-ring. The pillar portion undergoes controlled deformation while the D-ring portion moves accordingly, accurately replicating seat belt component movement without requiring actual vehicle exterior deformation
Solution Approach 2:
The fixture creates a functional copy of the B-pillar-D-ring interaction system. By replicating the kinematic relationship and deformation characteristics, it enables repeated testing of seat belt operation with realistic movement patterns while preserving the actual vehicle exterior for continued use
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
This solution enables realistic simulation of seat belt operation during a rollover, while maintaining the vehicle's exterior integrity for repeated testing, by simulating the permanent deformation of the B-pillar and associated seat belt movement, enhancing the accuracy of rollover component tests.
Implementation Method 1
A testing fixture with a piston and ratchet mechanism is integrated into the simulation setup, allowing the piston to extend and lock in place to simulate the deformation of the B-pillar
Data Source
AI summary
A testing fixture for a vehicle includes a tube and a piston slideably disposed in the tube. A seat belt D-ring is mounted t the piston. An actuator is supported on the tube in communication with the piston through the tube for moving the piston relative to the tube to an extended position in a designated time interval during a simulated vehicle rollover. The piston defines teeth, and a ratchet is supported on the tube and engages the teeth of the piston for preventing movement of the piston relative to the tube toward the retracted position during or after the simulated vehicle rollover.