An Ackerman steering linkage for short wheelbase, four-wheel vehicles has been developed. The linkage coordinates the steering angle of each wheel through a range of 180 degrees with minimal misalignment between wheels. Control of steering angles is accomplished using a single linear actuator. Control complexity is lower compared to four-wheel systems using individually controlled steering actu...

A technique is presented for monitoring the seated postural stability and control of human subjects. Estimates are made of the locations of the subject's center of pressure (CP(S)) and projection of the center of mass (CM(NP)) from moment balance equations using measured force and acceleration data. The CP(S) and CM(NP) indices describe the stability of the subject, independent of the chair, ev...

A microcomputer-based optimal control system for electric wheelchairs is presented. As the weight of a wheelchair is generally small compared to that of a user, the user's actual weight can have a tremendous impact on the dynamics of the wheelchair. The velocity feedback controller presented here was designed to give an optimal response for all users by incorporating a measure of the individual...

The current study emphasizes on improving an interval type-2 fuzzy logic control (IT2FLC) system through the use of spiral dynamics algorithm (SDA) optimization in stabilizing a transformational two-wheeled wheelchair. main contribution this research is to reduce vibrations while performing lifting and stabilization wheelchair from its standard four-wheeled transformation. IT2FLC based SDA was ...

Wheelchair racing is an important modality in the rehabilitation of people with mobility impairments; thus, it plays a significant role in the lives of many wheelchair users. This paper presents simple roll stability analyses for three- and four-wheeled rider/racing wheelchair systems during turning maneuvers. The results suggest that three-wheeled systems may be less stable than four-wheeled s...

Clearly, all considerations for wheelchair performance and their applicability to optimization of mobility are related to user position relative to the main wheel axis. It is also obvious that wheelchair performance is enhanced by a center of gravity position rearward of that which is characteristic of the generic wheelchair. The only obvious features of the generic wheelchair are excessive sta...

INTRODUCTION Handrim wheelchair propulsion is a mechanically inefficient mode of locomotion in comparison to arm cranking and cycling (de Groot et al., 2002). In addition, wheelchair propulsion has been associated with high physical strain and repetitive strain injuries (Janssen et al., 1994). The inefficiency of wheelchair propulsion has been attributed to factors such as, improper fit of the ...

The present work considers the development of a wheelchair for people with special needs, which is capable of navigating semi-autonomously within its workspace. This system is expected to prove useful to people with impaired mobility and limited fine motor control of the upper extremities. Among the implemented behaviors of this robotic system are the avoidance of obstacles, the motion in the m...

The design of brain-computer interface for the wheelchair for physically disabled people is presented. The design of the proposed system is based on receiving, processing, and classification of the electroencephalographic (EEG) signals and then performing the control of the wheelchair. The number of experimental measurements of brain activity has been done using human control commands of the wh...

Eyes base Electric Wheel Chair Control: EBEWC is proposed. The proposed EBEWC is controlled by human eyes only. Therefore disabled person can control the EBEWC by themselves. Most of the computer input system with human eyes only consider in specific condition and does not work in a real time basis. Moreover, it is not robust against various user races, illumination conditions, EWC vibration, a...