Product development: using a 3D computer model to optimize the stability of the Rocket powered wheelchair

Area of Science:

• Engineering
• Biomechanics
• Rehabilitation Technology

Background:

• Powered wheelchairs are crucial mobility devices.
• Assessing wheelchair stability is vital for user safety and performance.
• Innovative designs require robust evaluation methods.

Purpose of the Study:

• To develop and validate a 3D lumped-parameter model of a powered wheelchair.
• To investigate the impact of design features on wheelchair stability.
• To aid the development of the Rocket prototype wheelchair.

Main Methods:

• A three-dimensional (3D) lumped-parameter model was created using Working Model 3D simulation software.
• Model accuracy was validated by comparing static stability angles and dynamic curb negotiation with an actual wheelchair.
• Eight design alterations were simulated to assess their effect on lateral stability.

Main Results:

• The model demonstrated good accuracy, with static stability angle predictions within 9.3% (forward), 7.1% (rearward), and 3.8% (lateral) of measured values.
• The average absolute error for curb negotiation prediction was 2.2 cm/m.
• Wheelchair stability was found to be more sensitive to suspension system configuration than to dimensions or weight distribution.

Conclusions:

• The validated 3D model is a useful tool for evaluating powered wheelchair design and stability.
• Suspension system design is a critical factor in enhancing wheelchair stability.
• Improvements in static stability did not necessarily correlate with improvements in dynamic stability for the studied design alterations.