Prescribed-Time Output Feedback Control for Cyber-Physical Systems Under Output Constraints and Malicious Attacks.

Area of Science:

• Control Systems Engineering
• Cyber-Physical Systems Security
• Nonlinear Control Theory

Background:

• Cyber-physical systems (CPSs) face challenges from output constraints and malicious attacks.
• Existing control methods struggle with output constraints that occur only during finite time intervals (OC-AFT).
• Traditional control algorithms often have limitations with initial conditions and potential singularities.

Purpose of the Study:

• To develop a prescribed-time output feedback control (PTOFC) algorithm for CPSs.
• To address the complex OC-AFT and malicious attacks in finite time.
• To create a versatile control strategy applicable to various constraint scenarios, including constraint-free systems.

Main Methods:

• A stretch model-based nonlinear mapping function is designed to handle OC-AFT.
• Fuzzy logic systems are employed to compensate for uncertainties, including attacks and disturbances.
• A novel practical prescribed-time stability criterion is proposed for the control scheme.

Main Results:

• The proposed PTOFC algorithm ensures tracking and observation errors converge to near-zero within a prescribed time.
• The control scheme effectively accommodates OC-AFT and malicious attacks.
• Settling time is independent of control parameters and initial states, overcoming limitations of existing methods.

Conclusions:

• The developed PTOFC algorithm offers a robust and adaptable solution for CPS control under challenging conditions.
• The method eliminates issues like excessive initial control inputs and singularity problems.
• Simulation results validate the effectiveness of the proposed control scheme.