document: Product development : using a 3D computer model to optimize the stability of the Rocket TM powered wheelchair A three-dimensional -LRB- 3D -RRB- lumped-parameter model of a powered wheelchair was created to aid the development of the Rocket prototype wheelchair and to help explore the effect of innovative design features on its stability . The model was developed using simulation software , specifically Working Model 3D . The accuracy of the model was determined by comparing both its static stability angles and dynamic behavior as it passed down a 4.8-cm -LRB- 1.9 '' -RRB- road curb at a heading of 45 degrees with the performance of the actual wheelchair . The model 's predictions of the static stability angles in the forward , rearward , and lateral directions were within 9.3 , 7.1 , and 3.8 % of the measured values , respectively . The average absolute error in the predicted position of the wheelchair as it moved down the curb was 2.2 cm/m -LRB- 0.9 '' per 3 ' 3 '' -RRB- traveled . The accuracy was limited by the inability to model soft bodies , the inherent difficulties in modeling a statically indeterminate system , and the computing time . Nevertheless , it was found to be useful in investigating the effect of eight design alterations on the lateral stability of the wheelchair . Stability was quantified by determining the static lateral stability angles and the maximum height of a road curb over which the wheelchair could successfully drive on a diagonal heading . The model predicted that the stability was more dependent on the configuration of the suspension system than on the dimensions and weight distribution of the wheelchair . Furthermore , for the situations and design alterations studied , predicted improvements in static stability were not correlated with improvements in dynamic stability
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