Improved Normal and Shear Tactile Force Sensor Performance via Least Squares Artificial Neural Network (LSANN)
Name
LSANN_v2.pdf
Description
Main article
Size
12.25 MB
Format
Adobe PDF
Checksum (MD5)
a0219f6de168fd11a6f207931d72a977
Author(s)
Chuah, Meng Yee
Kim, Sangbae
Date Issued
May 2016
Journal
International Conference on Robotics and Automation (ICRA)
Publisher
Institute of Electrical and Electronics Engineers (IEEE)
Citation
Chuah, Meng Yee (Michael) and Sangbae Kim. "Improved Normal and Shear Tactile Force Sensor Performance via Least Squares Artificial Neural Network (LSANN)."
Version
Author's final manuscript
Abstract
This paper presents a new approach to the characterization of tactile array sensors that aims to reduce the computational time needed for convergence to obtain a useful estimator for normal and shear forces. This is achieved by breaking up the sensor characterization into two parts: a linear regression portion using multivariate least squares regression, and a nonlinear regression portion using a neural network as a multi-input, multi-output function approximator. This procedure has been termed Least Squares Artificial Neural Network (LSANN). By applying LSANN on the 2nd generation MIT Cheetah footpad, the convergence speed for the estimator of the normal and shear forces is improved by 59.2% compared to using only the neural network alone. The normalized root mean squared error between the two methods are nearly identical at 1.17% in the normal direction, and 8.30% and 10.14% in the shear directions. This approach could have broader implications in greatly reducing the amount of time needed to train a contact force estimator for a large number of tactile sensor arrays (i.e. in robotic hands and skin).
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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