Robust control of Piezoelectric Actuator using Fast Nonsingular Terminal Sliding Mode

Piezoelectric Actuators (PEAs) are essential elements in many systems that require high precision and accuracy. However, the difficulty with PEAs is its highly non-linear behaviour. This behaviour is a consequence of the hysteresis properties contained within PEAs. Therefore, a robust control system is essential for such actuators. This paper proposes a systematic control method that utilizes a Fast Non-singular Terminal Sliding Mode (FNTSM) for PEA. Unlike the conventional sliding mode (CSM), the FNTSM control method is characterised by chatter free. Besides, a zero error convergence can be guaranteed in finite time in the presence of disturbance and system uncertainties (i.e. hysteresis). The design of the FNTSM control is based on bounded information of parametric uncertainties. Theoretical analysis and the experimental results of FNTSM control reveal that faster and high-precision performance is achieved in comparison with CSM and a linear control method.