Fuzzy control system

Quantum mechanics

Adaptive control

Control (management)

Engineering

Backstepping

Servomotor

Control engineering

Computer science

Filter (signal processing)

Mechanical engineering

Physics

Nonlinear system

Hydraulic cylinder

Fuzzy logic

Lyapunov function

Artificial intelligence

Observer (physics)

Control theory (sociology)

Lyapunov stability

Servo

Servomechanism

Electrical engineering

IEEE Transactions on Instrumentation and Measurement

In this paper, the command filter-based adaptive fuzzy finite-time output feedback control (FOFC) is investigated for the Electro-hydraulic servo system. For the uncertainties in the system, we utilize the fuzzy logic systems (FLSs) to estimate these uncertain nonlinearities and fuzzy state observer is established to approximate the unmeasurable hydraulic cylinder stem speed and the internal cylinder force. Then, a command filter-based finite time output feedback control is proposed to achieve high tracking precision, where the tracking errors can be regulated into a small neighborhood around the equilibrium proved by the Lyapunov finite-time stability theory. Moreover, a command filter is introduced to avoid the explosion of complexity in the backstepping procedure, where a compensation mechanism is developed to compensate for filter errors. Finally, simulation results are provided to demonstrate the effectiveness of the proposed control.

Command Filter-Based Adaptive Fuzzy Finite-Time Output Feedback Control of Nonlinear Electrohydraulic Servo System