Development of computer-based environment for simulating the voluntary upper-limb movements of persons with disability |
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Authors: | Tong K Y Mak A F |
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Institution: | (1) Jockey Club Rehabilitation Engineering Centre, Hong Kong Polytechnic University, Kowloon, Hong Kong |
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Abstract: | Upper-limb orthotic systems have been designed for restoring the upperlimb functions of individuals with disabilities resulting
from spinal cord injury (SCI), stroke and muscular dystrophy. These systems employ either functional electrical stimulation
or external power. It is proposed that, instead of time-consuming and complicated monitoring using sensors and motion analysis,
a software simulator with both angular displacement and acceleration parameters can facilitate the design of a control strategy
for an orthosis. Reaching movements of three cervical SCI subjects are used to verify the simulator. A motion analysis system
is used to measure the range of motion and joint angles during hand reaching. Results indicate that quaternion and spline
curve techniques are suitable for interpolation of the hand reaching movements. The information needed for good simulation
only compress the shoulder and elbow joint angles in a few key postures. Stimulated acceleration signals on the upper-arm
segment have a high correlation coefficient (>0.9) and a small root mean squared error (<0.11 g) with a real bi-axial accelerometer. |
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Keywords: | Simulation Quaternion Spline interpolation Reaching movement Accelerometer Orthotic systems |
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