A New Wheelchair Ergometer Designed as an Admittance-Controlled Haptic Robot

Wheelchair ergometers aim to simulate the propulsion of a wheelchair in a controlled laboratory setup. One drawback of current ergometers is that the simulated wheelchair is always modeled as a simple unidimensional mass and friction, which do not allow a correct simulation of turning maneuvers. In this paper, we present a new design for a wheelchair ergometer based on haptic robotics. This ergometer allows us to simulate any linear or nonlinear model of the wheelchair-user system in real time, including models that implement turning maneuvers. The presented prototype was validated experimentally. The rear wheels of the ergometer match the rear wheels' velocities of the simulated wheelchair with a root-mean-square error of 0.9 %. Therefore, the ergometer's accuracy is mainly bounded by the accuracy of the wheelchair-user model, which means that future improvements of the wheelchair-user model will be directly reflected by the ergometer. The conditions for stability were also evaluated. A minimal simulated mass of 18 kg and a minimal simulated moment of inertia of 1 kg ·m2 are needed. These requirements are encountered by any wheelchair-user combination.

[1]  Alain Belli,et al.  Validation of a new ergometer adapted to all types of manual wheelchair , 2001, European Journal of Applied Physiology.

[2]  Rachid Aissaoui,et al.  A new dynamic model of the manual wheelchair for straight and curvilinear propulsion , 2011, 2011 IEEE International Conference on Rehabilitation Robotics.

[3]  Philippe Gorce,et al.  A wheelchair ergometer adaptable to the rear-wheel camber , 2008 .

[4]  Rachid Aissaoui,et al.  An Orientation Estimator for the Wheelchair's Caster Wheels , 2011, IEEE Transactions on Control Systems Technology.

[5]  Bernard A. Conway,et al.  Haptic Interfaces for Wheelchair Navigation in the Built Environment , 2004, Presence: Teleoperators & Virtual Environments.

[6]  Shahin Sirouspour,et al.  Adaptive Control of Haptic Interaction with Impedance and Admittance Type Virtual Environments , 2008, 2008 Symposium on Haptic Interfaces for Virtual Environment and Teleoperator Systems.

[7]  Rory A Cooper,et al.  A kinetic analysis of manual wheelchair propulsion during start-up on select indoor and outdoor surfaces. , 2005, Journal of rehabilitation research and development.

[8]  Rory A. Cooper,et al.  The development and preliminary evaluation of a training device for wheelchair users: The GAMEWheels system , 2006 .

[9]  Makoto Sasaki,et al.  Simulator for Optimal Wheelchair Design , 2008, J. Robotics Mechatronics.

[10]  Wai-nga Lam.  Biomechanics of upper extremities during manual wheelchair maneuvers , 2002 .

[11]  W. E. Langbein,et al.  Calibration of a new wheelchair ergometer: the wheelchair aerobic fitness trainer , 1993 .

[12]  C. J. Snijders,et al.  Computer-controlled wheelchair ergometer , 2006, Medical and Biological Engineering and Computing.

[13]  J. Subbarao,et al.  Prevalence and impact of wrist and shoulder pain in patients with spinal cord injury. , 1995, The journal of spinal cord medicine.

[14]  Blake Hannaford,et al.  Control law design for haptic interfaces to virtual reality , 2002, IEEE Trans. Control. Syst. Technol..

[15]  R. E. Ellis,et al.  Design and evaluation of a high-performance haptic interface , 1996, Robotica.

[16]  Fei Yao,et al.  Measurement and modeling of wheelchair propulsion ability for people with spinal cord injury , 2007 .

[17]  Ya-Jun Pan,et al.  A power based time domain passivity control for haptic interfaces , 2009, Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference.

[18]  Matthew Eicholtz.  DESIGN AND ANALYSIS OF AN INERTIAL PROPERTIES MEASUREMENT DEVICE FOR MANUAL WHEELCHAIRS , 2010 .

[19]  Blake Hannaford,et al.  Time domain passivity control with reference energy following , 2005, IEEE Transactions on Control Systems Technology.

[20]  Rory A. Cooper,et al.  Manual Wheelchair Propulsion Over Cross-Sloped Surfaces: A Literature Review , 2011 .

[21]  Shirley G Fitzgerald,et al.  The development and preliminary evaluation of a training device for wheelchair users: the GAME(Wheels) system. , 2006, Disability and rehabilitation. Assistive technology.

[22]  Alicia M Koontz,et al.  Multisite comparison of wheelchair propulsion kinetics in persons with paraplegia. , 2007, Journal of rehabilitation research and development.

[23]  R A Cooper,et al.  Dynamic calibration of a wheelchair dynamometer. , 2001, Journal of rehabilitation research and development.

[24]  Hong Z. Tan,et al.  HUMAN FACTORS FOR THE DESIGN OF FORCE-REFLECTING HAPTIC INTERFACES , 1994 .

[25]  Alicia M Koontz,et al.  Filter frequency selection for manual wheelchair biomechanics. , 2002, Journal of rehabilitation research and development.

[26]  H E Veeger,et al.  Biomechanics and physiology in active manual wheelchair propulsion. , 2001, Medical engineering & physics.

[27]  C. Sauret,et al.  Drag force mechanical power during a propulsion cycle on a manual wheelchair , 2007 .

[28]  M. Buss,et al.  A New Admittance-Type Haptic Interface for Bimanual Manipulations , 2008, IEEE/ASME Transactions on Mechatronics.

[29]  Rory A Cooper,et al.  Preliminary outcomes of the SmartWheel Users' Group database: a proposed framework for clinicians to objectively evaluate manual wheelchair propulsion. , 2008, Archives of physical medicine and rehabilitation.

[30]  Xavier Daniel Martin,et al.  Analyse critique des matériels et des méthodes d’évaluation de l’aptitude physique chez le blessé médullaire en fauteuil roulant , 2002 .