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Artificial neural network-based model predictive visual servoing for mobile robots

Published online by Cambridge University Press:  18 September 2024

Seong Hyeon Hong
Affiliation:
Florida Institute of Technology, Melbourne, FL, USA
Benjamin Albia
Affiliation:
University of South Carolina, Columbia, SC, USA
Tristan Kyzer
Affiliation:
University of South Carolina, Columbia, SC, USA
Jackson Cornelius
Affiliation:
CFD Research Corporation, Huntsville, AL, USA
Eric R. Mark
Affiliation:
Army Research Laboratory, Aberdeen Proving Ground, MD, USA
Asha J. Hall
Affiliation:
Army Research Laboratory, Aberdeen Proving Ground, MD, USA
Yi Wang*
Affiliation:
University of South Carolina, Columbia, SC, USA
*
Corresponding author: Yi Wang; Email: yiwang@cec.sc.edu

Abstract

This paper presents an artificial neural network (ANN)-based nonlinear model predictive visual servoing method for mobile robots. The ANN model is developed for state predictions to mitigate the unknown dynamics and parameter uncertainty issues of the physics-based (PB) model. To enhance both the model generalization and accuracy for control, a two-stage ANN training process is proposed. In a pretraining stage, highly diversified data accommodating broad operating ranges is generated by a PB kinematics model and used to train an ANN model first. In the second stage, the test data collected from the actual system, which is limited in both the diversity and the volume, are employed to further finetune the ANN weights. Path-following experiments are conducted to compare the effects of various ANN models on nonlinear model predictive control and visual servoing performance. The results confirm that the pretraining stage is necessary for improving model generalization. Without pretraining (i.e., model trained only with the test data), the robot fails to follow the entire track. Weight finetuning with the captured data further improves the tracking accuracy by 0.07–0.15 cm on average.

Information

Type
Research Article
Copyright
© The Author(s), 2024. Published by Cambridge University Press

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