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Test Method to Evaluate the Forward Facing Wheelchair Containment and Occupant Retention System Subjected to Low G Accelerations

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Student Designers: Loshna Krishnan, Erik Porach (University of Pittsburgh)


Abstract

Test setup and potential system movement of a Manual wheelchair and a Hybrid II ATD
Test setup and potential system movement of a Manual wheelchair and a Hybrid II ATD

Previous studies have shown the need to design new forward facing wheelchair containment and occupant retention systems (WCORS) in large accessible transit vehicles (LATVs). The purpose of this project was to design a test method that is able to replicate real world scenarios for a low g environment. A rotational acceleration system was developed that consists of a beam, rotary table, drive motor and support surface which effectively rotated the wheelchair creating a centripetal force similar to forces measured during real world LATV turning, braking and accelerating scenarios. A manual wheelchair occupied by a Hybrid II ATD was used for evaluation. Results of this design project indicate a promising new test method to evaluate alternative wheelchair containment systems that are subjected to low g accelerations in large accessible transit vehicles (LATVs).


Solution

The Object of the study was to evaluate the testing device, and use it to simulate accelerations at 0.8g, decelerations at 0.4g and turning at 0.45g that match real world acceleration and to replicate incidents that frequently occur in LATVs such as wheelchair tipping, sliding and wheelchair seated passenger ejection from the wheelchair seat.

For full story, visit Design of a test method to evaluate the Forward Facing Wheelchair containment and occupant retention system subjected to low g accelerations

References