Simulation of a Terrain Versatile Walker-Wheelchair With Torso Support

Abstract

Much of the population have mobility disabilities. A market analysis highlighted the lack of a low-cost mobility solution that could provide terrain versatility, torso support, combined wheelchair functionality, and sit-to-stand assistance. Furthermore, the use of common, readily available parts for device life maintenance is advantageous for the intended use in rural areas. This study describes a design for a mobility solution. A simulation and analysis are performed using multi-body software to determine the interaction between the vehicle on different types of obstacles, as well as determine forces in the riskiest parts of the design for connection strength analysis. To complete this simulation, several determinations had to be obtained to use proper constraints for the system, such as the force the caregiver would push with and the damping of the tires. A physical test is performed to find the average force required to push a wheelchair and patient over outdoor, bumpy terrain. This study makes multiple suggestions for mobility device design that contrast with trending design priorities in the medical device industry and provides evidence for these recommendations. The results of the created simulations are used to make design choices regarding wheel configuration and size.