Self-sensing of deflection, force, and temperature for joule-heated twisted and coiled polymer muscles via electrical impedance

Self-sensing of deflection, force, and temperature for joule-heated twisted and coiled polymer muscles via electrical impedance

van der Weijde, J.O. (TU Delft Biomechatronics & Human-Machine Control)
Smit (student), B.
Fritschi, M. (TU Delft Learning & Autonomous Control)
van de Kamp, C. (TU Delft Learning & Autonomous Control)
Vallery, H. (TU Delft Biomechatronics & Human-Machine Control)

2017

The recently introduced twisted and coiled polymer muscle is an inexpensive and lightweight compliant actuator. Incorporation of themuscle in applications that rely on feedback creates the need for deflection and force sensing. In this paper, we explore a sensing principle that does not require any bulky or expensive additional hardware: Self-sensing via electrical impedance. To this end, we characterize the relation between electrical impedance on the one hand, and deflection, force, and temperature on the other hand for the Joule-heated version of this muscle. Investigation of the theoretical relations provides potential fit functions that are verified experimentally. Using these fit functions results in an average estimation error of 0.8%, 7.6%, and 0.5%, respectively, for estimating deflection, force, and temperature. This indicates the suitability of this self-sensing principle in the Joule-heated twisted and coiled polymer muscle.

Artificial muscle
compliant actuator
deflection
impedance
inductance
integrated sensing
selfsensing

http://resolver.tudelft.nl/uuid:d09afa8c-0d6a-42c0-8e0f-6d2326aea03b

https://doi.org/10.1109/TMECH.2016.2642588

1083-4435

IEEE - ASME Transactions on Mechatronics, 22 (3), 1268-1275

Accepted Author Manuscript

Institutional Repository

journal article

© 2017 J.O. van der Weijde, B. Smit (student), M. Fritschi, C. van de Kamp, H. Vallery