Nonsingular Integral Terminal Sliding Mode Control for Resonant Frequency Tracking of Electromagnetic Acoustic Transducers (EMATs) Based on Fixed-Time Strategy

• Published in: Micromachines (Basel) Vol. 13; no. 11; p. 2005
• Main Authors: Yuan, Haichao, Li, Qi, Peng, Ran, Wang, Chuan, Xu, Peng, Pan, Xinxiang, Xu, Minyi
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.11.2022; MDPI
• Subjects: Accuracy; Acoustics; Circuit components; Control methods; Control systems; Control theory; Controllers; Convergence; Design; Efficiency; Electromagnetism; EMATs; fixed-time strategy; Function analysis; High temperature; Influence; Liapunov functions; Machine learning; Methods; Microelectromechanical systems; Neural networks; nonsingular terminal sliding mode control; Resonant frequencies; resonant frequency tracking; Robustness (mathematics); Simulation; Sliding mode control; Tracking control; Tracking errors; Transducers; Ultrasonic transducers; Working conditions
• ISSN: 2072-666X; 2072-666X
• DOI: 10.3390/mi13112005

Resonant frequency tracking control of electromagnetic acoustic transducers (EMATs) remains a challenge in terms of drifting working frequency and reduced conversion efficiency caused by working environment changes. This paper presents a fixed-time nonsingular integral terminal sliding mode (FT-NITSM) control strategy for resonant frequency tracking of EMATs to realize precise and high robustness resonant frequency tracking performance. Specifically, a FT-NITSM control method with fast convergence feature is developed and a resonant frequency tracking controller for EMATs is further designed to improve the convergence speed and tracking accuracy. Fixed time stability of the proposed frequency tracking control system is proved through Lyapunov function analysis. Moreover, numerical simulations demonstrate that the FT-NITSM control strategy can ensure precise tracking of the system’s operating frequency to its natural resonant frequency in less than 3 s with a tracking error of less than 0.01 × 104 Hz. With the maximum overshoot variation between −20 and 20 and error range in −5 and 5° at the steady state, the FT-NITSM control strategy can ensure the control system impedance angle θ being consistent and eventually bounded. This study provides a toolbox for the resonant frequency tracking control and performance improvement of EMATs.