Road loads acting on manual wheelchairs.

A barrier to performing more in-depth analyzes during the wheelchair design process is a lack of dynamic reaction force and moment data, and the instrumentation to collect this data. Instrumentation was developed to collect the dynamic force and moment data. New data collections methodologies and analysis techniques were implemented to facilitate computer-aided-engineering for wheelchair designs. Data were collected during standardized wheelchair fatigue tests, while driving over a simulated road course within a laboratory, and while driving in the community. Seventeen subjects participated in this study. Based upon the three test conditions, a pseudo-statistical distribution of the force and moment data at both a caster and rear wheel was developed. The key parameters describing the distribution and the extremums of the data (minima and maxima) were compared using analysis of variance. The results showed that the force and moment distributions and extreme values were similar for the both sets of human trials (i.e., simulated road course and field trials). However, the standardized testing (i.e., wheelchair fatigue testing) differed from both human trials. The force/moment data gathered during this study are suitable for inputs in finite element analysis and dynamic modeling. Our results suggest that the fatigue tests should be modified to change the magnitude and increase the frequency of the forces and moments imparted on the wheelchair. The data reported from this study can be used to improve wheelchair standards and to facilitate computer-aided-engineer in wheelchair design.

[1]  Brubaker Ce,et al.  Wheelchair prescription: an analysis of factors that affect mobility and performance. , 1986 .

[2]  R A Cooper,et al.  Performance of selected lightweight wheelchairs on ANSI/RESNA tests. American National Standards Institute-Rehabilitation Engineering and Assistive Technology Society of North America. , 1997, Archives of physical medicine and rehabilitation.

[3]  R N Robertson,et al.  Life-cycle analysis of depot versus rehabilitation manual wheelchairs. , 1996, Journal of rehabilitation research and development.

[4]  M. M. DiGiovine,et al.  User assessment of manual wheelchair ride comfort and ergonomics. , 2000, Archives of physical medicine and rehabilitation.

[5]  Thacker Jg,et al.  Strain-based fatigue analysis of wheelchairs on a double roller fatigue machine. , 1995 .

[6]  Merhyle Franklin Spotts Design of machine elements , 1948 .

[7]  David M. Brienza,et al.  Design of a computer-controlled seating surface for research applications , 1993 .

[8]  Thacker Jg,et al.  Characterization of the dynamic stress response of manual and powered wheelchair frames , 1993 .

[9]  Rory A. Cooper,et al.  Rehabilitation Engineering Applied to Mobility and Manipulation , 1995 .

[10]  Richard S. Payne,et al.  Surface Micromachined Accelerometer: A Technology Update , 1991 .

[11]  Pasqualina M. Sarro,et al.  Silicon accelerometer based on thermopiles , 1995 .

[12]  J. Hoffman Numerical Methods for Engineers and Scientists , 2018 .

[13]  R. Patterson,et al.  continuous sitting force measurements with differ- ent support surfaces in the spinal cord injured and able-bodied , 1991 .

[14]  Robert J. Bernhard,et al.  Active control of simulated road noise , 1991 .

[15]  P Axelson,et al.  Wheelchair standards: an overview. , 1990, Journal of rehabilitation research and development. Clinical supplement.

[16]  Rory A. Cooper,et al.  Development Of A Now ISO Wheelchair Two-drum Tester , 1991, Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society Volume 13: 1991.

[17]  Rajesh Rajamani,et al.  Adaptive observers for active automotive suspensions: theory and experiment , 1995, IEEE Trans. Control. Syst. Technol..

[18]  R A Cooper,et al.  Design of a composite monocoque frame racing wheelchair. , 1993, Journal of rehabilitation research and development.

[19]  Rory A. Cooper Wheelchair Selection and Configuration , 1998 .

[20]  K.-C. Chung,et al.  Seat support surface optimization using force feedback , 1993, IEEE Transactions on Biomedical Engineering.

[21]  R A Cooper,et al.  Evaluation of selected ultralight manual wheelchairs using ANSI/RESNA standards. , 1999, Archives of physical medicine and rehabilitation.

[22]  C Hershler,et al.  Pressure ulcer prophylaxis in elderly patients using polyurethane foam or Jay wheelchair cushions. , 1994, International journal of rehabilitation research. Internationale Zeitschrift fur Rehabilitationsforschung. Revue internationale de recherches de readaptation.

[23]  J.K. Hedrick,et al.  Adaptive Observer for Active Automotive Suspensions , 1993, 1993 American Control Conference.

[24]  J. Bendat,et al.  Random Data: Analysis and Measurement Procedures , 1987 .