System Identification and Two-Degree-of-Freedom Control of Nonlinear, Viscoelastic Tissues.
| Autor: | Bianco A, Zonis R, Lauzon AM, Forbes JR, Ijpma G |
|---|---|
| Jazyk: | angličtina |
| Zdroj: | IEEE transactions on bio-medical engineering [IEEE Trans Biomed Eng] 2022 Dec; Vol. 69 (12), pp. 3803-3811. Date of Electronic Publication: 2022 Nov 21. |
| DOI: | 10.1109/TBME.2022.3179655 |
| Abstrakt: | Objective: This paper presents a force control scheme for brief isotonic holds in an isometrically contracted muscle tissue, with minimal overshoot and settling time to measure its shortening velocity, a key parameter of muscle function. Methods: A two-degree-of-freedom control configuration, formed by a feedback controller and a feedforward controller, is explored. The feedback controller is a proportional-integral controller and the feedforward controller is designed using the inverse of a control-oriented model of muscle tissue. A generalized linear model and a nonlinear model of muscle tissue are explored using input-output data and system identification techniques. The force control scheme is tested on equine airway smooth muscle and its robustness confirmed with murine flexor digitorum brevis muscle. Results: Performance and repeatability of the force control scheme as well as the number of inputs and level of supervision required from the user were assessed with a series of experiments. The force control scheme was able to fulfill the stated control objectives in most cases, including the requirements for settling time and overshoot. Conclusion: The proposed control scheme is shown to enable automation of force control for characterizing muscle mechanics with minimal user input required. Significance: This paper leverages an inversion-based feedforward controller based on a nonlinear physiological model in a system identification context that is superior to classic linear system identification. The control scheme can be used as a steppingstone for generalized control of nonlinear, viscoelastic materials. |
| Databáze: | MEDLINE |
| Externí odkaz: |
|