Neural network control of functional neuromuscular stimulation systems

Computer simulation studies

James Abbas, H. J. Chizeck

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

A neural network control system has been designed for the control of cyclic movements in Functional Neuromuscular Stimulation (FNS) systems. The design directly addresses three major problems in FNS control systems: customization of control system parameters for a particular individual, adaptation during operation to account for changes in the musculoskeletal system, and attaining resistance to mechanical disturbances. The control system was implemented by a two-stage neural network that utilizes a combination of adaptive feedforward and feedback control techniques. A new learning algorithm was developed to provide rapid customization and adaptation. The control system was evaluated in a series of studies on a computer simulated musculoskeletal model. The model of electrically stimulated muscle used in the study included nonlinear recruitment, linear dynamics, and multiplicative nonlinear torque-angle and torque-velocity scaling factors. The skeletal model consisted of a one-segment planar system with passive constraints on joint movement. Results of the evaluation have demonstrated that the control system can provide automated customization of the feedforward controller parameters for a given musculoskeletal system. It can account for changes in the musculoskeletal system by adapting the feedforward controller parameters on-line and it can resist the effects of mechanical disturbances. These results suggest that this design may be suitable for the control of FNS systems and other dynamic systems.

Original languageEnglish (US)
Pages (from-to)1117-1127
Number of pages11
JournalIEEE Transactions on Biomedical Engineering
Volume42
Issue number11
DOIs
StatePublished - Nov 1995
Externally publishedYes

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Musculoskeletal system
Neural networks
Control systems
Computer simulation
Torque
Controllers
Feedforward control
Learning algorithms
Feedback control
Muscle
Dynamical systems

ASJC Scopus subject areas

  • Biomedical Engineering

Cite this

Neural network control of functional neuromuscular stimulation systems : Computer simulation studies. / Abbas, James; Chizeck, H. J.

In: IEEE Transactions on Biomedical Engineering, Vol. 42, No. 11, 11.1995, p. 1117-1127.

Research output: Contribution to journalArticle

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